140814.-ThuyetMinhMo

Chng I

n mn hc Trng i hc Cng Ngh Giao thng Vn ti

Li cm n

n tt nghip i hc c hon thnh ti trng i hc Cng Ngh Giao Thng Vn ti H Ni. C c n tt nghip ny E xin by t lng bit n chn thnh v su sc ti cc thy v cc c trong trng Giao Thng, c bit l thy gio Nguyn Tin Hng trc tip hng dn, du dt, gip E vi nhng ch dn khoa hc qu gi trong sut qu trnh trin khai E hon thnh tt n.Mt ln na E xin chn thnh cm n cc thy c gio Trng i hc Cng Ngh Giao thng Vn ti H Ni trc tip ging dy truyn t nhng kin thc chuyn ngnh cho bn thn E trong nhng nm thng qua.

Sinh vin thc hin

inh Quang HuyLp 63DLCD - 07

NHN XT CA GIO VIN

MC LCPHN I: LP D N XY DNG CNG TRNH5CHNG 1: GII THIU CHUNG51.1. S cn thit phi u t:51. 2.Cc iu kin t nhin, kinh t, x hi51.2.1. a hnh:61.2.2.Kh tng61.3.Yu cu thit k71.3.1.Quy m71.3.2.Tiu chun thit k71.3.3.Tiu chun vt liu7CHNG 2: PHNG N 1 CU DM BN RNG NHP GIN N BTCT D NG LC82.1.B tr chung82.1.1.S cu92.1.2.Kt cu phn trn92.1.3.Kt cu phn di102.1.4.ng dn hai u cu102.2.Cu to cc hng mc102.2.1.Cu to dm bn rng102. 2.2.Cu to m cu112.3.Bin php thi cng112.3.1.Thi cng m112.3.2.Thi cng kt cu nhp12CHNG 3: PHNG N 2 CU DM GIN N BTCT DL T22M133.1.B tr chung:133.1.1. B tr chung mt ct ngang cu.143.1.2 Chn mt ct ngang dm ch.143.1.3. Chiu cao kt cu nhp ti thiu:143.2.Cu to m cu:153.3. Bin php thi cng:153.3.1.Thi cng m.153.3.2.Thi cng kt cu nhp.16CHNG 4: SO SNH LA CHN PHNG N174.1 V kinh k:174.2. V k thut:184.3. V m quan:19PHN II: THIT K K THUT20CHNG 1: THIT K CHI TIT CC HNG MC201.1 Xc nh ti trng tc dng ln kt cu:201.1.1.Tnh ti201.1.2. Tnh ti do kt cu phn trn :201.1.3. Tnh ti do kt cu phn di231.1.4. Quy tnh ti v tim dc ca m241.1.5. Hot ti (LL)261.1.6. Lc hm xe (BR).271.1.7 Lc ma st (FR).281.1.8 Lc li tm (CE).281.1.9 Ti trng gi tc dng ln kt cu (WS).281.1.10. Ti trng gi tc dng ln xe c (WL).301.1.11. Ni lc do trng lng t p.301.1.12. Ni lc do p lc t EH , LS tc dng ln thn m.301.1.13. Ni lc do p lc t EH , LS tc dng ln tng cnh321.1.14. T hp ti trng341.2. Thit k ct thp cho cc mt ct.371.3. Thit k mng m521.3.1.a cht khu vc521.3.2.Bng tm tt cc ch tiu c l ca cc lp a cht521.3.3.La chn cc thng s c bn ca cc521.3.4.Tnh ton sc chu ti ca cc theo vt liu531.3.5.Tnh ton sc chu ti ca cc theo t nn531.3.6.Tnh sc khng n v ca thn cc qs (MPa)541.3.7.Tnh sc khng n v ca mi cc qp (MPa)551.3.8.Tng hp sc chu ti ca cc (N)551.3.9.Tnh ton s lng cc.561.3.10.Xc nh ni lc u cc v chuyn v i cc561.3.11.Kim ton cc651.3.12.Thit k ct thp cho i cc721.3.13.Kim tra chc thng i cc75CHNG 2: CU TO CHUNG KT CU NHP762.1. Cu to dm.762.2. Lan can, tay vn82PHN III: THIT K T CHC THI CNG833.1. Trnh t cc bc thi cng.833.2. Thit k thi cng chi tit.833.2.1. Tnh ton vn khun:833.2.2 Tnh ton vn khun nm nghing:913.2.3. Tnh ton cc vn thp943.2.4. Thi cng m M2983.2.5. Tin thi cng:1023.2.6. B tr nhn lc, vt t, my mc, thit b thi cng105PHN D TONBIU TIN THI CNG

PHN I: LP D N XY DNG CNG TRNHCHNG 1: GII THIU CHUNG1.1. S cn thit phi u t: Cu A1, l trnh Km2+311.46, thuc d n ng trc Kinh T Bc Nam, tnh Hng Yn, cu c thit k mi hon ton.Cu nm trn con ng huyt mch ni lin Bc Nam.Cn c Ngh nh s 12/2009/N-CP ngy 12/2/2009 ca chnh ph v qun l d n u t xy dng cng trnh1. 2.Cc iu kin t nhin, kinh t, x hi 1.2.1. a hnh:Khu vc thuc ng bng Bc B, a hnh tng i bng phng, khng c ni i. a hnh thp dn t Ty Bc xung ng Nam( vi dc 0.14%) xen k nhng t trng thng xuyn b ngp nc1.2.2.Kh tngNi y mang y cc nt kh hu ca min Bc Vit Nam, l kiu kh hu nhit i gi ma,nng m ma nhiu v c mt ma ng lnh.Kh hu khu vc c chia lm 2 ma r rt l ma ma v ma kh.Ma ma bt u t thng 5 n thng 10, thi tit nng ma nhiuMa kh bt u t thng 11 n thng 4 nm sau. Thi tit kh hanh v lnh, tri t ma, lng ma nh, nhit xung thpNhit : -Nhit trung bnh nm l 23,30C-Ma h nhit trung bnh nhiu nm 27,40C-Ma ng nhit trung bnh nhiu nm 19,20CMa: - Lng ma trung bnh trong nm dao ng trong khong 1500mm 1600mm -Trong ma ma l 1200 1300, bng 80-85% tng lng ma ca nm -Ma kh l 200 300mm,khong 15-20% tng lng ma ca nm m: - m trung bnh nm t 85-90%- m cao nht trong nm xut hin vo thng 2- m nh nht trong nm xut hin vo thng 11 v 12Gi, bo:- Trong khu vc c 2 ma gi chnh : Ma ng c gi ma ng bc, thng t thng 10 n thng 3 nm sau. Ma h c gi ng nam thng t thng 3 n thng- Gi ng nam chim u th trong nm, sau l gi ng bc. Cc hng khc ch xut hin an xen nhau tn sut thp khng thnh h thng- Tc gi cc i ghi li ti trm kh tng Hng Yn l 40m/s, hng thi Ty Nam(ngy 22/5/1978)- Hng nm nhng nh hng ca bo gy ra l rt ln,lng ma do bo gy ra chim 15- 20% tng lng ma ca nm. Ma bo bt u t thng 5 v kt thc vo thng 11 nhng nh hng ti tn sut ln nht trong cc thng 7,8,91.2.3.Kt qu tnh ton thy lc, thy vn cng trnh:Lu lng thit k: Q1%=44,76(m3/sMc nc: H1%=3,43(m)Khu Lo=24(m)Vn tc thit k V1%=0,81(m/s)1.2.4.Xc nh cao y dm: Theo s liu tnh ton thy vn H = H1%+0,5m=3,43+0.5=3,83m Theo cng vn ca cng ty khai thc CLTL huyn Vn Lm, sng c tu ht bn hot ng. cao y dm H=Hh+Ht+Hat=1.5+3.0+0.5=5m trong :H: Cao y dm thit kHh: Cao mc nc trn sng tu ht bn hot ng Hh=1.5mHt: Chiu cao tu ht bn Ht=3.0mHat: Chiu cao an ton Hat=0.5m Vy cao y dm c chn l : H=5.0m1.2.5.a cht: 1- Lp 1: Lp t p(st pha mu xm nu,xm vng,trng thi do cng) 2- Lp 3: St pha mu xm nu,xm ghi ln t hu c,trng thi chy do 3- Lp 4: St mu xm nu,xm vng,trng thi do cng 4- Lp 5: Ct ht bi nh mu xm nu,xm vng,i ch xm hng,kt cu xp, cht va 5- Lp 6: Ct ht va mu xm nu,xm xanh,kt cu cht va 6-Lp 7: St mu xm nu,loang l xm xanh,trng thi na cng cng 7- Lp 8: St pha kt ct pha mu xm nu,xm ghi,trng thi do cng1.3.Yu cu thit k1.3.1.Quy m- Cu xy dng vnh cu bng BTCT v BTCTDUL- Tn sut thit k : P= 1%- Ti trng thit k: HL93- B rng ton cu: Btc=12.0m- Chiu di ton cu: Ltc= 35.1m- Theo tiu chun chung ca on tuyn Km0+00 -:- Km6+203.001.3.2.Tiu chun thit k- Tiu chun thit k ng oto : TCVN 4054 2005- Tiu chun thit k cu: 22TCN 272-051.3.3.Tiu chun vt liu- Thp DUL: +Dng tao thp 7 si 12.7mm gii hn bn 1860 MPa +DL ngang dung b cp 4 tao 7 si 12.7mm-Thp thng: theo TCVN1651-1985 hoc tng ng-B tng: theo tiu chun chung cu ton d n

CHNG 2: PHNG N 1 CU DM BN RNG NHP GIN N BTCT D NG LC2.1.B tr chung 2.1.1.S cu

Hnh 1: Chnh din cu

Hnh 2: Mt ct ngang cuNhp gin n L=24m2.1.2.Kt cu phn trn-Nhp cu gin n BTCT DUL lp ghp. B tng dm 40MPa-Ct ngang nhp b tr 12 dm bn bng BTCT DUL-Chiu cao dm H= 0.95m-B tng mt cu 30MPa dy 10cm,lp phng nc 0.4cm, b tng nha 7cm-Gi cu: gi cao su bn thp-Khe co gin:bng cao su- ng thot nc bng thp m km-Lan can :Bng thp bn v ng thp m km-Dc ngang mt cu 2 mi 2%,dc dc cu 0%-Ct thp thng theo tiu chun chung ca ton d n2.1.3.Kt cu phn di-M cu ch U bng BTCT f'c=30MPa,mng cc khoan nhi, m t trn 8 cc khoan nhiD1200, chiu di d kin cc L=45m2.1.4.ng dn hai u cu-10m ng u cu c thit k theo tiu chun ng cp III v m rng mi bn 0.5m, tip theo l 15m vut vo ng2.2.Cu to cc hng mc2.2.1.Cu to dm bn rng

Hnh 3.1. Mt ct gia dm Hnh 3.2 Mt ct dm bin

2. 2.2.Cu to m cu

Hnh 4: Mt bn m cu2.3.Bin php thi cng 2.3.1.Thi cng m-Bc 1: Chun b mt bng thi cng +Dng my xc kt hp o th cng n cao 2.5-Bc 2:ng vng vy cc vn thp +nh v chnh xc tim m +ng cc nh v vng vt cc vn t tim m chy dc ven mi bn 17,5m ng thi ng vng vy 2 pha ct ngang -Bc 3: Thi cng cc khoan nhi +nh v chnh xc v tr tim cc +Rung h ng vch, khoan n cao thit k +Tin hnh ra l khoan,t lng thp + b tng cc-Bc 4: b tng b mng +o t mng bng th cng n cao -1.19m +p u cc n cao -0.94m. lp b tng y mng M100,dy 10cm +Lp dng ct thp,vn khun, b tng b m-Bc 5: b tng thn m v hon thin +Lp dng ct thp vn khun b tng thn m +Tip tc b tng tng cnh m m +Lp tr li c v hin trng ban u +Thi cng bn qu , ng 2 u cu2.3.2.Thi cng kt cu nhp-Bc 1: Lao lp kt cu nhp +Khi thi cng xong m lp t h thng ng vn chuyn dm +Vn chuyn dm t bi c dm vo v tr u nhp +a dm vo KCN bng gi long mn-Bc 2: Thi cng dm ngang- mt cu, cng tc hon thin +Dng vn khun, gio thi cng dm ngang +Thi cng lp mt cu,lp t h thng thot nc +Thi cng khe co gin +Thng xe k thut +Thanh thi lng sui,cm cc tiu,bin bo +Hon thin,bn giao cu

CHNG 3: PHNG N 2 CU DM GIN N BTCT DL T22M3.1.B tr chung:

Hnh 5: Mt chnh din cu

Hnh 6: Mt ct ngang cua. Chn s kt cu nhp- Mt ct ngang kt cu nhp gm 6 dm T b tng ct thp d ng lc cng trc- Khong cch cc dm l 1900 mm -Chiu di mi dm l 22000mm-Cu 1 nhp-Chiu di cu 35 m tnh t 2 ui m-Chiu cao mi dm l 1200 mm-Dm ngang bng b tng ct thp ti ch-Bn mt cu dy 200 mm-Lp phng nc dy 5 mm-Lp ph mt cu bng b tng Asphalt dy 5 cm-Lp B tng xi mng bo v dy 40 mm-Lan can lm bng thp CT3-Gi cu s dng gi cao su c bn thpb. M cu-M cu l m ch u bng b tng ct thp.-Mng m l mng cc khoan nhi ng kch cc khoan 1,2m , 6 cc khoan nhi chiu di d kin khong 45 mChn tit din mt ct dm ch.3.1.1. B tr chung mt ct ngang cu.- Tng chiu di ton dm l 22m, hai u dm mi bn 0,2m k gi. Nh vy chiu di nhp tnh ton ca nhp cu l 21,6m.- Cu gm 6 dm c mt ct ch T ch to bng btng c fc= 50Mpa.- Khong cch gia cc dm ch S =1900 mm- Gia phn xe chy v l ngi i phn cch bng gii phn cch mm3.1.2 Chn mt ct ngang dm ch.Dm ch c tit din hnh ch T vi cc kch thc sau:- Chiu dy bn cnh : ts =200 mm- Chiu cao ton dm: H =1200 mm- Chiu rng bu dm: bb = 500 mm- Chiu cao bu dm: hb =200 mm- Chiu dy bng: bw =200 mm- Chiu rng bn cnh: b1 =1500 mm- Chiu rng vt cnh: 100 mm- Chiu cao vt cnh: 100 mm- Chiu rng vt bu: 150 mm- Chiu cao vt bu: 150 mm- Phn hng: 750 mm3.1.3. Chiu cao kt cu nhp ti thiu: Yu cu: hmin=0,045.L Trong ta c:L: Chiu di nhp tnh ton L=21600 mm hmin: Chiu cao ti thiu ca kt cu nhp k c bn mt cu, suy ra: hmin = 0,045.L = 0,045.21600 = 972 mm < h=1600mm

Tha mn. 3.2.Cu to m cu:

Hnh 7: Cu to m cu3.3. Bin php thi cng:3.3.1.Thi cng m.-Bc 1: Chun b mt bng thi cng +Dng my xc kt hp o th cng n cao 2.5-Bc 2:ng vng vy cc vn thp +nh v chnh xc tim m +ng cc nh v vng vt cc vn t tim m chy dc ven mi bn 17,5m ng thi ng vng vy 2 pha ct ngang -Bc 3: Thi cng cc khoan nhi +nh v chnh xc v tr tim cc +Rung h ng vch, khoan n cao thit k +Tin hnh ra l khoan,t lng thp + b tng cc-Bc 4: b tng b mng +o t mng bng th cng n cao -1.19m +p u cc n cao -0.94m. lp b tng y mng M100,dy 10cm +Lp dng ct thp,vn khun, b tng b m-Bc 5: b tng thn m v hon thin +Lp dng ct thp vn khun b tng thn m +Tip tc b tng tng cnh m m +Lp tr li c v hin trng ban u +Thi cng bn qu , ng 2 u cu3.3.2.Thi cng kt cu nhp.-Bc 1: Lao lp kt cu nhp +Khi thi cng xong m lp t h thng ng vn chuyn dm +Vn chuyn dm t bi c dm vo v tr u nhp +a dm vo KCN bng gi long mn-Bc 2: Thi cng dm ngang- mt cu, cng tc hon thin +Dng vn khun, gio thi cng dm ngang +Thi cng lp mt cu,lp t h thng thot nc +Thi cng khe co gin +Thng xe k thut +Thanh thi lng sui,cm cc tiu,bin bo

CHNG 4: SO SNH LA CHN PHNG N la chn mt phng n tt nht ta phi tin hnh so snh chng v cc ch tiu kinh k K thut M Quan v iu kin duy tu bo dng cng nh kh nng khai thc ca chng4.1 V kinh k:Bng A: Bng tng hp kinh ph phng n 1 cu dm bn rngSTTCHI PHCCH TNHGI TR ()K HIU

CHI PH THEO N GI

Chi ph vt liu8.366.645.831A1

Chnh lch vt liu3.500.056.411CLVL

Chi ph nhn cng733.154.250B1

Chi ph my xy dng3.100.123.456C1

Chnh lch chi ph my xy dngBng CLVT756.981.285CLM

ICHI PH TRC TIP

1Chi ph vt liu(A1 + CLVL) * 111.866.702.242VL

2Chi ph nhn cngB1 * 5,0863.728.822.516NC

3Chi ph my xy dngC1*1+CLM3.857.104.741M

4Trc tip ph khc(VL+NC+M)*2%389.052.590TT

Cng chi ph trc tipVL+NC+M+TT19.841.682.088T

IICHI PH CHUNGT * 5,5%1.091.292.515C

GI THNH D TON XY DNGT+C20.932.974.603Z

IIITHU NHP CHU THU TNH TRC(T+C) * 6%1.255.978.476TL

Gi tr d ton xy dng trc thuT+C+TL22.188.953.080G

IVTHU GI TR GIA TNGG * 10%2.218.895.308GTGT

Gi tr d ton xy dng sau thuG + GTGT24.407.848.387GxDCPT

Chi ph xy nh tm ti hin trng v iu hnh thi cngG * 1% * (1+10%)244.078.484GxDLT

CNG24.651.926.871

LM TRN24.651.927.000

Bng B: Bng tng hp kinh ph phng n 1 cu dm ch TSTTCHI PHCCH TNHGI TR ()K HIU

CHI PH THEO N GI

Chi ph vt liu8.465.645.831A1

Chnh lch vt liu3.550.052.413CLVL

Chi ph nhn cng753.155.252B1

Chi ph my xy dng3.100.123.456C1

Chnh lch chi ph my xy dngBng CLVT756.981.285CLM

ICHI PH TRC TIP

1Chi ph vt liu(A1 + CLVL) * 112.015.698.244VL

2Chi ph nhn cngB1 * 5,0863.830.547.612NC

3Chi ph my xy dngC1*1+CLM3.857.104.741M

4Trc tip ph khc(VL+NC+M)*2%394.067.012TT

Cng chi ph trc tipVL+NC+M+TT20.097.417.609T

IICHI PH CHUNGT * 5,5%1.105.357.968C

GI THNH D TON XY DNGT+C21.202.775.577Z

IIITHU NHP CHU THU TNH TRC(T+C) * 6%1.272.166.535TL

Gi tr d ton xy dng trc thuT+C+TL22.474.942.112G

IVTHU GI TR GIA TNGG * 10%2.247.494.211GTGT

Gi tr d ton xy dng sau thuG + GTGT24.722.436.323GxDCPT

Chi ph xy nh tm ti hin trng v iu hnh thi cngG * 1% * (1+10%)247.224.363GxDLT

CNG24.969.660.686

LM TRN24.969.661.000

So snh v khi lng ta thy cu dm bn rng nh hn cu dm ch T. Nn v kinh t ta chn phng n 1 l Cu dm bn rng.4.2. V k thut:Hai phng n c k thut thi cng khc nhau, chiu di dm ca 2 phng n l nh nhau. Nhng phng n 1 c u im s dng k thut thi cng cc khoan nhi nn an ton cho khai thc. Chiu cao ca dm I ln hn dm bn rng nn v kh nng thng thuyn dm bn rng s tt hn dm I Kh nng chng xon ca dm I km hn dm bn rng Thi cng bn mt cu dm bn rng n gin hn dm I4.3. V m quan:Do kt cu dm bn di ca dm bn rng kh bng phng nn ph hp vi ni c mc nc thp,trong th. Cn v dm I th bn di gh gh nn khng thch hp ni nc cn v trong thV duy tu bo dngNgy nay chng ta hiu BTCT v BTCT d ng lc l loi vt liu l tng c kh nng cnh tranh vi nhiu loi vt liu khc. B tng c kh nng chng li cc tc ng ca mi trng tt nn trong qu trnh s dng khng phi mt nhiu ch ph duy tu bo dng.Kt lun: Ta chn phng n 1 lm phng n thit k cu chnh do c tnh an ton cho khai thc s dng.

PHN II: THIT K K THUTCHNG 1: THIT K CHI TIT CC HNG MC1.1 Xc nh ti trng tc dng ln kt cu:1.1.1.Tnh ti- Chiu di nhp:L = 24 m- Chiu di nhp tnh ton:Ltt = 23.6 m - S lng dm dc:n = 12- Trng lng ring t p: 18 kN/m31.1.2. Tnh ti do kt cu phn trn :- S lng dm ch:Nb = 12 dm- Khong cch gia 2 dm ch:S = 1000 mm- Dm ch:- on dm ct khc:

- Din tch tit din

- T trng btng dm ch- Trng lng on dm:

- on dm c:

- Din tch tit din- Trng lng on dm:

-on dm cn li:

- Din tch tit din- Trng lng on dm:

- Tnh ti dm ch coi l ti trng ri u sut chiu di dm:

-Bn mt cu:

-Vn khun lp ghp:

-Vch ngn:Vi dm c chiu di 33 m, ta dng 2 vch ng mng dy 15 cm chia dm lm 3 khoang. Vch ngn ny c tc dng tng n nh khi cu lp dm.

-Ti trng lan can:Ta gi thit ti trng lan can c qui v b va v truyn xung dm bin v dm gia l khc nhau, phn nm ngoi bn hng s do dm bin chu, cn phn nm trong s chia cho dm bin v dm trong chu theo t l khong cch t dim t lc n mi dm.

-Tnh ti do thanh lan can ( tnh phn lan can, tay vn):

-Trng lng ca mt ct lan can: , mi ct lan can cch nhau 2000mm, phn b trn chiu di ton cu (24000 mm), nn c tng cng 12 ct.-Suy ra tnh ti do ct lan can qui v lc phn b l:

-Tnh ti lan can tay vn

-Khong cch t tim dm bin n mp trong b va l de = -800 mm-Dm gia:

-Dm bin:

Vy:

-Dm bin:

-Dm gia: -Tnh ti lp ph mt cu v tin ch cng cng-Lp ph b tng atfan

-Lp phng nc

-Lp mui luyn

-Tin ch v trang thit b trn cu

Vy : -Phn lc gi khng c h s do mt dm ch tc dng ln m-Dm bin:

-Dm gia:

1.1.3. Tnh ti do kt cu phn di

Hnh 8: M cu- B m:

-Tng thn :

-Tng u (trn) :

-Mu bn qu :

-Tng cnh (phn ui):

m3

-Tng cnh (phn thn):

- k gi v gi k:

-Tng cng :

1.1.4. Quy tnh ti v tim dc ca mTnh ti do kt cu phn trn truyn xung kt cu m s gy ra ni lc thng ng Pi, m men quay quanh trc ngang cu My (trng hp ny bng 0 v cc dm i xng), v mmen quay quanh trc dc cu Mx, ty theo khong cch gia v tr tim gi v trng tm ca cc b phn tnh ton ni lc.- Nhng mt ct cn tnh ton thn m l: mt ct G-G (y b) ; D-D (y tng thn) ; C-C (tng nh) ; B-B (tng cnh phn thn) v H-H (tng cnh phn ui)-Quy c moment hng ra sng mang du m, hng vo b mang du dngBng 1: Tnh ni lc cho tit din G-G bi tnh ti phn trnTnh ti phn trnDC (N)DW (N)x (mm)MyDC (Nmm)MyDW (Nmm)

Dm 1603768110385000

Dm 2488961110385000

Dm 3488961110385000

Dm 4488961110385000

Dm 5488961110385000

Dm 6488961110385000

Dm 7488961110385000

Dm 8488961110385000

Dm 9488961110385000

Dm 10488961110385000

Dm 11488961110385000

Dm 12603768110385000

Tng4630263993465000

Bng 2: Tnh ni lc cho tit din D-D bi tnh ti phn trnTnh ti phn trnDC (N)DW (N)x (mm)MyDC (Nmm)MyDW (Nmm)

Dm 1603768110385000

Dm 2488961110385000

Dm 3488961110385000

Dm 4488961110385000

Dm 5488961110385000

Dm 6488961110385000

Dm 7488961110385000

Dm 8488961110385000

Dm 9488961110385000

Dm 10488961110385000

Dm 11488961110385000

Dm 12603768110385000

Tng463026399346500

Bng 3: tnh ni lc cho tit din G-G bi trng lng bn thnKt cuTit din A-A

P(N)e (mm)M(N.mm)

B m396000000

Tng thn158000000

Tng u157500425141312500

Mu bn qu 4275080644330000

Tng cnh (ui)292503456101088000

Tng cnh (phn thn)805001790157967500

k gi33670-225-7575750

Tng cng6121170437122250

Bng 4: tnh ni lc cho tit din B-B bi trng lng bn thnKt cuTit din B-B

P(N)e (mm)M(N.m)

Tng thn85750000

Tng u332500425141312500

Mu bn qu 5500080644330000

k gi336702257575750

Tng cng1278670193218250

Bng 5: Tnh ni lc cho tit din C-C bi trng lng bn thnKt cuTit din C-C

P(N)e (mm)M(N.m)

Tng u33250000

Mu bn qu 5500038120955000

Tng cng38750020955000

1.1.5. Hot ti (LL)

Hnh 9: Xp ti dc cu.

-Theo phng dc cu xp xe trn tt c cc ln xe trn 1 nhp gy ra phn lc gi V v mmen My ln nht.-Phn lc gi do xe 3 trc:

-Phn lc ti gi do xe tandem:

-Phn lc ti gi do ti trng ln gy ra

-Phn lc ti gi do ti trng ngi b hnh gy ra

-So snh cc t hp do hot ti gy ra:-T hp 1:

-T hp 2:

-Chn t hp 2 tnh ton, lc nn ln nht khng h s c tnh nh sau :

Bng 6: Kt qu tnh ton hot tiTrucky11.0000145000298208

y20.8754145000

y30.750735000

Tandemy11.0000110000216172

y40.9652110000

Lanelan (mm2)172509.3160425

PeoplePL (mm2)172504.577625

T hp 1 (1 ln cht ti)490395

T hp 2 (1 ln cht ti)416562

Tng (n ln cht ti)1114983

1.1.6. Lc hm xe (BR).Lc hm xe c truyn t kt cu trn xung m qua gi . Tu theo tng loi gi cu v dng lin kt m t l truyn ca lc ngang xung tr khc nhau. Do m cu ta dng gi di ng do lc ngang khng nh hng n m cu.1.1.7 Lc ma st (FR).Lc ma st gi cu c xc nh da trn c s gi tr cc i ca h s ma st gia cc mt trt. FR c xc nh nh sau:

Trong : fmax : H s ma st gia b tng v gi cu (di ng), fmax=0.3N : phn lc gi do tnh ti v hot ti (khng k xung kch gy ra)

Ntt: Tng phn lc gi do tnh ti

Nht: Tng phn lc gi do hot ti

Vy

-im t lc ma st so vi mt ct D-D:

-im t lc ma st so vi mt ct G-G: 1.1.8 Lc li tm (CE).Do y ta thit k m ca cu thng nn khng c lc li tm1.1.9 Ti trng gi tc dng ln kt cu (WS).-Ti trng gi ngang-Din tch hng gi ca kt cu thng tng bxh c xc nh nh sau:

v

-Din tch hng gi ca kt cu m c xc nh bao gm din tch cnh m v thn m

-Ti trng gi ngang PB phi c ly theo chiu tc dng nm ngang v t ti trng tm ca cc phn din tch thch hp, c tnh nh sau:

Trong :

-Tc gi gi s c ly trong vng 4 do tc gi

-i vi sc gi tiu chun Trong :VB - Tc gi git c bn trong 3 giy vi chu k xut hin 100 nm thch hp vi vng tnh gi c t cu ang nghin cu, nh quy nh trong bng 3.8.1.1- 1.S : h s iu chnh i vi khu t chu gi v cao mt cu theo quy nh trong bng 3.8.1.1.2Cd : H s cn c quy nh trong A3.8.1.2.1.1, ph thuc vo t s b/d.b = 17000 Chiu rng ton b ca cu gia cc b mt lan can (mm)

d = 2970 Chiu cao kt cu phn trn bao gm c lan can c, nu c (mm). Trong bi, ta ly h s cn gi

Tng t vi sc gi tiu chun l 25 m/s th ta c

Gi s mt hng gi vung gc phng gi, khi gi ngang l:

Lc gi: -Lc gi theo phng dc bng 0Bng 7: Ti trng gi ngang WS xt ti mt ct G-GKt cuez (mm)Aw.sup (mm2)WS (N)Mx (Nmm)WS25 (N)Mx25 (Nmm)

M3162.61061552334235108271611615719472128.2

KCPT42605230500016868471859384030337129235620

Tng20291982686545136494148707748.2

Bng 8: Ti trng gi ngang WS xt ti mt ct D-DKt cuez (mm)Aw.sup (mm2)WS (N)Mx (Nmm)WS25 (N)Mx25 (Nmm)

M1362.610615523342354664861161578389528.2

KCPT2460523050001686844149626403033774629020

Tng2029194616112513649483018548.2

1.1.10. Ti trng gi tc dng ln xe c (WL). - Ti trng gi ngang: Theo A3.8.1.3, khi xt t hp ti trng cng III, phi xt ti trng gi tc dng vo c kt cu v xe c.- Ti trng ngang ca gi ln xe c bng ti phn b 1.5 N/mm, tc dng theo hng nm ngang, ngang vi tim dc kt cu v t 1.8m trn mt ng.

- Chiu di tham gia ti trng gi tc dng ln xe c ly bng chiu di dm tc dng ln tr

-Ti trng gi dc-Ti trng gi dc ln xe c bng ti trng phn b 0.75 N/mm tc dng nm ngang, song song vi tim dc kt cu v t cao 1800 mm so vi mt ng. -Ly trng hp xp xe ht ton b mt cu.

1.1.11. Ni lc do trng lng t p.Chiu cao t p sau m = 2600 mmChiu rng m chu tc dng ca cc lp (khng k tng cnh) = 16900 mDin tch tc dng ca cc lp = 39292500 mm2Trng lng ring ca t p sau m = 18 KN/m3Chiu cao t p trc m = 0Din tch chu tc dng = 40657500 mm2Bng 9: Tnh ni lc cho tit din G-G bi trng lng t pKt cuTit din G-G

P (N)e (mm)M (Nmm)

t sau m183888918383379877982

t trc m0-18380

Tng cng18388893379877982

1.1.12. Ni lc do p lc t EH , LS tc dng ln thn m.- p lc ngang t EH- p lc ngang ca t p ln m tnh theo cng thc

Trong b = 16.9 mH : chiu cao p lc t H1 chiu cao p lc t tc dng ti tit din G-G = 4.41 mH2 chiu cao p lc t tc dng ti tit din D-D = 2.61 mH3 chiu cao p lc t tc dng ti tit din C-C = 1.18 mK : H s p lc ngang ca t. i vi tng c dch chuyn K c ly bng Ka l h s p lc ch ng ca t.

Trong :

Gc ma st gia t p v tng

Gc ca t p vi tng nm ngang

Gc ca t p sau tng vi phng thng ng

Gc ni ma st c hiuTa c:

- cao t lc tc dng : tr khi c quy nh khc, tng ti trng ngang ca t do trng lng bn thn t lp phi gi nh tc dng cao 0.4 H.H l tng chiu cao tng tnh t mt t p n y mng.Tit dinp lc ngang ca t p ln tng (EH)

HP(N)e(mm)M(Nmm)

G-G44109584101764-1690635500

D-D26103357031044-350473945

C-C118068618472-32387710

-p lc ngang do hot ti cht thm LS-Khi hot ti ng sau m trong phm vi bng chiu cao tng chn ,tc dng ca hot ti c th thay bng lp t tng ng c chiu cao hcq-Ap lc ngang do hot ti sau m tnh theo cng thc :

-V tr t hp lc l 0.5HTrong :K = 0.324Hcq Chiu cao lp t tng ng ph thuc vo chiu cao tng chn (m)Tit dinAp lc ngang do hot ti sau m (Ls)

H(mm)hcq(mm)LS(N)M(Nmm)

G-G4410993431611-951702255

D-D26101330342134-446484870

C-C11801700197713-116650670

-Ngoi p lc ngang LS ni trn, cn phi tnh n p lc thng ng (VS) do lp t tng ng tc dng ti mt ct G-G khi thit k m. Tr s VS c tnh nh sau :

1.1.13. Ni lc do p lc t EH , LS tc dng ln tng cnh-p lc ngang t EH-Ap lc ngang ca t p ln m tnh theo cng thc

Trong L: Chiu rng tng cnh chu ti trng t p sau m

L1 :Chiu rng tng cnh tc dng ti tit din B-B:

L2: Chiu rng tng cnh tc dng ti tit din H-H: H : chiu cao p lc t

H1 chiu cao p lc t tc dng ti tit din B-B H2 chiu cao p lc t tc dng ti tit din H-H

K : H s p lc ngang ca t. i vi tng c dch chuyn K c ly bng Ka l h s p lc ch ng ca t.

Trong :

Gc ma st gia t p v tng

Gc ca t p vi tng nm ngang

Gc ca t p sau tng vi phng thng ng

Gc ni ma st c hiuTa c:

- cao t lc tc dng : tr khi c quy nh khc, tng ti trng ngang ca t do trng lng bn thn t lp phi gi nh tc dng cao 0.4 H.H l tng chiu cao tng tnh t mt t p n y mng.Tit dinAp lc ngang ca t p ln tng cnh (EH)

H (mm)L (mm)P(N)e(mm)M(Nmm)

B-B2610223044297104446245970

H-H180512702118672215296215

-p lc ngang do hot ti cht thm LSKhi hot ti ng sau m trong phm vi bng chiu cao tng chn ,tc dng ca hot ti c th thay bng lp t tng ng c chiu cao hcq-Ap lc ngang do hot ti sau m tnh theo cng thc :

-V tr t hp lc l 0.5HTrong :K = 0.324Hcq Chiu cao lp t tng ng ph thuc vo chiu cao tng chn (m)L: Chiu rng tng cnh chu ti trng t p sau m

L1 :Chiu rng tng cnh tc dng ti tit din B-B:

L2: Chiu rng tng cnh tc dng ti tit din H-H: H : chiu cao p lc t

H1 chiu cao p lc t tc dng ti tit din B-B H2 chiu cao p lc t tc dng ti tit din H-H

Tit dinAp lc ngang do hot ti sau m ln tng cnh(LS)

H(mm)hcq(mm)L (mm)LS(N)M(Nmm)

B-B26101330223045146-58915530

H-H18051598127037520-33861800

1.1.14. T hp ti trngMt ct G-GBng 10: H s ti trng mt ct G_GTn ti trngC IC IIC IIISD

Tnh ti nhp v mDC1.251.251.251

Lp phDW1.51.51.51

p lc ngang ca tEH1.51.51.51

Tnh ti t pEV1.351.351.351

Hot ti xe tLL1.7501.351

p lc ngang do hot ti sau mLS1.7501.351

Gi ln cng trnhWS01.40.40.3

Gi ln xe cWL0011

Lc hm xeBR1.7501.351

H s iu chnh ti trng1.051.051.051

Bng 11: Tm tt ti trng xt ti mt ct G-GTn ti trngV(N)Hx(N)My(Nmm)Hy(N)Mx(Nmm)

Tnh ti nhp v mDC107514330-60468692500

Lp phDW9934650-22352962500

p lc ngang ca tEH0958410-169063550000

Tnh ti t pEV18388890337987798200

Hot ti xe tLL13637180-30683650503811331550

p lc ngangdo hot ti sau mLS0431611-95170225500

p lc thng ngdo hot ti sau mLS702314.10645426699.300

Gi lncng trnhNgang cu000202919826865451827700354

Dc cu000000

Gi lnxe cNgang cu00024750160998750182899200

Dc cu012375-80499375000

Lc ma stFR01252675-435304562500

Bng 12: T hp ti trng xt ti mt ct G-GT hp ti trngN(N)Hng dcHng ngang

Hx(N)My(N.mm)Hy(N)Mx(N.mm)

TTGH CI220789223617890-471477593907003321723

TTGH CII182825882824805-35881825282982911215492213

TTGH CIII212111893449607-4541793218413155634068414

TTGH SD149475052223460-38793555731103764381388685

Mt ct D-DBng 13: Tm tt ti trng xt ti mt ct D-DTn ti trngVHxMyHyMx

(N)(N)(Nmm)(N)(Nmm)

Tnh ti nhp v mDC59089330-84859092500

Lp phDW9934650-22352962500

p lc ngang ca tEH0335703-35047394500

Hot ti xe tLL13637180-30683650503811331550

p lc ngang do hot ti sau mLS0342134-44648487000

Gi ln cng trnhNgang cuWS000202919461611251

Dc cuWS00000

Gi ln xe cNgang cuWL00024750116448750

Dc cuWL012375-5822437500

Lc ma stFR01252675-209823062500

Bng 14: T hp ti trng xt ti mt ct D-DT hp ti trngN(N)Hng dcHng ngang


TTGH CI118260132472712-560520139507003321723

TTGH CII93201821844041-4220973368298291678568539

TTGH CIII112532522342010-5349942011413155559701450

TTGH SD82661161942887-4332370870856264066263675

Mt ct C-CBng 15: Tm tt ti trng xt ti mt ct C-CTn ti trngVHxMyHyMx

(N)(N)(Nmm)(N)(Nmm)

Tnh ti nhp v mDC38750002095500000

p lc ngang ca tEH068618-3238771000

p lc ngangdo hot ti sau mLS0197713-11665067000

Bng 16: T hp ti trng xt ti mt ct C-CT hp ti trngN(N)Hng dcHng ngang


TTGH CI508594471371-23785281200

TTGH CII508594108073-2350720600

TTGH CIII508594388332-18885953000

TTGH SD387500266331-12808338000

Mt ct B-BBng 17: Tm tt ti trng xt ti mt ct B-BTn ti trngHyMz

(N)(Nmm)

p lc ngang ca tEH4429746245970

Ap lc ngang do hot ti sau mLS4514658915530

Bng 18: T hp ti trng xt ti mt ct B-BT hp ti trngHng ngang

Hy(N)Mx(N.mm)

TTGH CI152723181094689

TTGH CII6976872837403

TTGH CIII133762156350167

TTGH SD89443105161500

Mt ct H-HBng 19: Tm tt ti trng xt ti mt ct H-HTn ti trngHyMz

(N)(Nmm)

p lc ngang ca tEH2118615296215

Ap lc ngang do hot ti sau mLS3752033861800

Bng 20: T hp ti trng xt ti mt ct H-HT hp ti trngHng ngang

Hy(N)Mx(N.mm)

TTGH CI10231186312596

TTGH CII3336824091539

TTGH CIII8655272090640

TTGH SD5870649158015

1.2. Thit k ct thp cho cc mt ct.Thit k ct thp cho tng thn (mt ct D-D)

Cng chu nn ca b tng a) Phng dc cu-Kim tra mnh ca ct :

-Din tch tit din :

-Mmen qun tnh theo phng y:

-Bn knh qun tnh:

Trong :

K : l h s ph thuc vo iu kin lin kt 1 u ngm 1 u t do ()L : chiu di thn tr=> Thit k ct khng xt n nh hng mnh

Thit k nh bi ton ct ngn c : ,

Chiu cao c hiu ca tit din Chiu cao vng nn trng thi ph hoi cn bng :

Cng nn thp trng thi ph hoi cn bng :

Do -Sc khng thit k trng thi ph hoi cn bng :

-Do cu kin ph hoi do, xc nh lng ct thp thng qua phng trnh ca Whitney:

Trong :

Vy ta s b tr thp theo cu to vi c

b) Phng ngang cu:-Kim tra mnh ca ct :

-Din tch tit din :

-Mmen qun tnh theo phng y:

-Bn knh qun tnh:

Trong :

K : l h s ph thuc vo iu kin lin kt 1 u ngm 1 u t do ()L : chiu di thn tr=> Thit k ct khng xt n nh hng mnh

Thit k nh bi ton ct ngn c : ,

Chiu cao c hiu ca tit din Chiu cao vng nn trng thi ph hoi cn bng :

-Cng nn thp trng thi ph hoi cn bng :

Do -Sc khng thit k trng thi ph hoi cn bng :

-Do cu kin ph hoi do, xc nh lng ct thp thng qua phng trnh ca Whitney:

Trong :

Vy ta s b tr thp theo cu to vi c) Thit k ct ai cho thn m-Kh nng chu ct ca dm phi tho mn:

Trong

lc ct do ngoi lc tc dng

h s sc khng

sc khng ct ca dm -Sc khng ct ca dm

Trong

sc khng ct ca btng

(5.8.3.3-3)Trong :

h s ch kh nng ca btng b nt cho

cng chu nn ca btng

b rng bn bng hu hiu ly bng b rng bn bng nh nht trong chiu cao chu ct hu hiu

kh nng chu ct ca ct ai

(5.8.3.3-4)Trong

din tch ct thp ai chu ct trong c ly S

cng chu ct ca ct ai

chiu cao chu ct hu hiu

c ly ct thp ai

-Kh nng chu ct ca thp ai c xem l nh nht khi gc nghing ca vt nt v , do n gin trong thit k lc ct, bc thp ai s tnh trong trng hp ny

-Chiu cao vng nn:

-Kim tra iu kin

-Xc nh chiu cao chu ct hu hiu

-Kh nng chu ct ca b tng:

(5.8.3.3-3)Trong :


cng chu nn ca btng

b rng bn bng hu hiu ly bng b rng bn bng nh nht trong chiu cao chu ct hu hiu

Yu cu kh nng chu ct ca thp ai:

- Ta thy ch ring b tng kh nng chu ctVy ta b tr ct ai theo cu to 20 nhnh 16

-Kim tra theo iu kin cu to

Trong : ta c

Vy:Vy chn khong cch ct ai l 200 mmd) Kim tra iu kin chng nt thn m :-Mmen trng thi gii hn s dng

Theo phng dc cu :

Theo phng dc cu : -Kim tra nt theo phng dc cu-Cng thc kim tra:

(22TCN-272-05 iu 5.7.3.4-1)Trong :

: chiu cao b tng tnh t th chu ko ngoi cng n trng tm ct thp gn nht, .A : Din tch b tng c cng trng tm vi ct thp ch chu ko, v c bao bi cc mt ca mt ct ngang v ng thng song song vi trc trung ha.

Z: thng s b rng vt nt, i vi kh hu khc nghit th Z = 23000.

.

Do ta dng gi tr 252 MPa so snh vi .

Tnh theo cng thc: -Modun n hi ca b tng

-H s tnh i t thp sang b tng

-Chiu cao vng nn ca b tng khi nt

-Momen qun tnh tit din khi nt

=>Ta thy:

nn m bo iu kin v nt.-Kim tra nt theo phng ngang cu-Cng thc kim tra:

(22TCN-272-05 iu 5.7.3.4-1)Trong :


Z: thng s b rng vt nt, i vi kh hu khc nghit th Z = 23000.

.


-Tnh theo cng thc:

Trong :-Modun n hi ca b tng

-T s tnh i t thp sang b tng

-Chiu cao vng nn khi b tng nt

-Momen qun tnh tit din nt

=>Ta thy:

=>nn m bo iu kin v nt.1.2.2.Thit k ct thp tng nh (mt ct C C)a) Thit k ct thp dc tng nh

-Sc khng danh nh

-Chiu cao vng nn:

-Kim tra iu kin ph hoi do

vy tho iu kin

-Din tch ct thp: -Kim tra iu kin ct thp ti thiu:

Vy chn

Ta chn b) Thit k ct ai cho tng nh m-Kh nng chu ct ca dm phi tho mn:

Trong

lc ct do ngoi lc tc dng

h s sc khng

sc khng ct ca dm- Sc khng ct ca dm

Trong

sc khng ct ca btng

(5.8.3.3-3)Trong


cng chu nn ca btng

b rng bn bng hu hiu ly bng b rng bn bng nh nht trong chiu cao


kh nng chu ct ca ct ai

(5.8.3.3-4)Trong

din tch ct thp ai chu ct trong c ly S

cng chu ct ca ct ai


c ly ct thp ai

Kh nng chu ct ca thp ai c xem l nh nht khi gc nghing ca vt nt v , do n gin trong thit k lc ct, bc thp ai s tnh trong trng hp ny

-Chiu cao vng nn:


-Kh nng chu ct ca b tng:

-Yu cu kh nng chu ct ca thp ai:

Ta thy ch ring b tng kh nng chu ctVy ta b tr ct ai theo cu to ct ai 2 nhnh 16a200-Kim tra theo iu kin cu to

Trong ta c

Vy:Vy chn bc ct ai l 200 mmc) Kim tra kh nng chu nt trng thi gii hn s dng:

-Cng thc kim tra:

(22TCN-272-05 iu 5.7.3.4-1)Trong :


Z: thng s b rng vt nt, i vi kh hu khc nghit th Z=23000.Ta c :

.


-Tnh theo cng thc:-Modun n hi ca b tng

-H s tnh i t thp sang b tng

-Chiu cao vng nn ca b tng khi nt

-Momen qun tnh tit din khi nt

=>Ta thy:

nn m bo iu kin v nt.1.2.3.Tnh ton thit k phn tng cnha) Tnh ton ct thp cho mt ct B-B (tng cnh phn thn)

-Tit din tnh ton : -Cng thp: fy = 280 MPa.

-Momen tnh ton -Sc khng danh nh:

-Chiu cao c hiu ca tit din

-Chiu cao vng nn :

-Kim tra iu kin

vy tho iu kin

-Din tch ct thp: -Kim tra iu kin ct thp ti thiu:

Vy chn b tr ct thp

Ta chn b) Thit k ct ai cho tng cnh

-Lc ct cnh m theo:-Kh nng chu ct ca dm phi tho mn:

Trong

: Lc ct do ngoi lc tc dng

:H s sc khng

: Sc khng ct ca dm

Trong

:Sc khng ct ca btng

(5.8.3.3-3)Trong

: H s ch kh nng ca btng b nt cho

: Cng chu nn ca btng ,

:B rng bn bng hu hiu ly bng b rng bn bng nh nht trong chiu cao ,

: Chiu cao chu ct hu hiu

:Kh nng chu ct ca ct ai

(5.8.3.3-4)Trong

:Din tch ct thp ai chu ct trong c ly S

:Cng chu ct ca ct ai

:Chiu cao chu ct hu hiu

:C ly ct thp ai

Kh nng chu ct ca thp ai c xem l nh nht khi gc nghing ca vt nt v , do n gin trong thit k lc ct, bc thp ai s tnh trong trng hp ny

-Chiu cao vng nn:a = 10.5 mm-Kim tra iu kin


-Vy kh nng chu ct ca b tng:

-Yu cu kh nng chu ct ca thp ai:

Ta thy ch ring b tng kh nng chu ctVy ta b tr ct ai theo cu to 2 nhnh 16

-Kim tra theo iu kin cu to

Trong ta c

Vy:Vy chn khong cch ct ai l 200 mmc) Kim tra iu kin chng nt-Ta s kim tra nt cnh m trng thi gii hn s dng:

-Tit din tnh ton:

Cc gi tr ca c trn.-Khong cch t th chu ko ngoi cng n trng tm ct thp chu ko gn nht:

-Din tch ca vng btng bc quanh 1 nhm thp

-Din tch trung bnh ca btng bc quanh 1 thanh thp:

-Khi lng ring ca btng:

-Modul n hi ca btng:

-Modul n hi ca thp:

-H s tnh i t thp sang btng:

-Chiu cao vng nn ca btng khi tit din nt:

-Moment qun tnh ca tit din btng khi nt:

-ng sut trong ct thp do ngoi lc gy ra:

-Da vo iu kin mi trng tra ra Z,:

-ng sut cho php trong ct thp:

So snh: nn chn kim tra

Vy =>Vy tit din tho iu kin chu ntd) Kim ton mt ct B-B thun tin cho vic b tr v thi cng ct thp tng cnh, ta s b tr ct thp tng cnh(phn ui) ging vi ct thp tng cnh(phn thn) c tnh ton trn. Do cc gi tr lc ct v momen u thp hn ti mt ct B-B nn ta khng cn kim ton.1.3. Thit k mng m1.3.1.a cht khu vc 1.3.2.Bng tm tt cc ch tiu c l ca cc lp a cht1.3.3.La chn cc thng s c bn ca cc- ng knh D = 1.2 m- Chiu di cc L = 45 m tnh t y i cc, trong chiu di cc t y i cc n mt lp t sau xi l l 0 m, chiu di cc ngm trong dt l 45 m, chiu di cc ngm trong i cc l 200 mm.- Chu vi mt ct ngang cc: 3.768 m- Din tch mt ct ngang cc: 1.13 m2- ng knh ct thp dc: 20 mm- Khong cch tim n tim gia cc cc phng dc cu : d = 1.8 m- Khong cch tim n tim gia cc cc phng ngang cu : d = 1.8 m

- Trng lng ring ca vt liu lm cc: = 25 KN/m3.- Cng btng: fc = 30 MPa.1.3.4.Tnh ton sc chu ti ca cc theo vt liu- Sc chu ti ca cc theo vt liu cho bi cng thc sau (s dng ct ai xon):

Trong : = 0.75 : H s un dc.fc= 30 MPa : Cng chu nn ca btng.Ac = 1.745 m2 : Din tch ca phn btng.fy = 400 MPa: Cng chu nn ca ct thp.

: Din tch ca thp. (1820)

1.3.5.Tnh ton sc chu ti ca cc theo t nnSc chu ti ca cc theo t nn c cho bi cng thc sau y:

Trong : : h s nhm cc, theo 10.7.3.10.2 : = 0.73Qp : Sc khng mi cc (N)Ap : Din tch mi cc (m2)Qs : Sc khng thn cc (N)As : Din tch b mt thn cc (m2)

: h s sc khng mi trong t st

= 0.55 (Bng 10.5.5-3)

: h s sc khng thnh bn trong t st:

= 0.65 (Bng 10.5.5-3)1.3.6.Tnh sc khng n v ca thn cc qs (MPa)- t ct : (Tnh theo Reese v Wright) (iu 10.8.3.4.2)

(vi N 53)

(vi 5360)N: S ba SPT cha hiu chnh, ly N theo tng loi t.-t dnh : (iu 10.8.3.3.2)

-Loi t ti mi cc l ct, ch s SPT l : 44, vy sc khng mi cc l :

1.3.8.Tng hp sc chu ti ca cc (N)

Xt y ni ca cc:Trng lng ca phn cc ngp trong nc

Vy sc chu ti theo t nn ca cc:

So snh vi sc khng ca cc theo vt liu ta chn sc chu ti ca cc theo t nn thit k cc.

1.3.9.Tnh ton s lng cc.

Trong : n : S lng cc trong mng

V: Tng lc ng tnh ti y b TTGH CDI Q: Sc chu ti tnh ton ca cc theo t nn: H s k n nh hng ca ti trng ngang v momen, = 1.1 1.5 chn = 1.5

Chn 8 cc v c b tr nh sau.

Hnh 10: Mt bng m cu1.3.10.Xc nh ni lc u cc v chuyn v i ccXc nh chiu di chu un LM v chu nn LN ca cc:

Trong : Lo: Khong cch t y b n mt t sau khi xi L0 = 0 m D: ng knh cc. L: Chiu di cc .

: Gc nging ca cc

M un n hi ca btng : (fc = 30 MPa)

Din tch tit din ngang :

Momen qun tnh : Bng 21: Tng hp ni lc ti mt ct y b G-GTTGHP(kN)Hng dcHng ngang

Hx(kN)My(kN.m)Hy(kN)Mx(kN.m)

CI220793618471507003

CII18283282535882981215

CIII2121134504542415634

SD14948222338791104381

Kim tra cc trng thi gii hn cng nh s th t cc:

Hnh 11: Mt bng ccK hiu cc trong ii cc c xem nh cng tuyt i.Ta tnh ton trong hai mt phng nh hnh v, v ni lc ln nht trong cc c tnh bng cch cng hai trng hp li vi nhau-Tnh cho trng hp ngang cuTi trng tnh ton trng thi gii hn cng 1 c lc nn max

H phng trnh chnh tc xc nh chuyn v ti y b l:

u,v, : chuyn v ngang, chuyn v thng ng, gc quay ca b quang im O (trng tm h to tnh ton ti y b) rik : phn lc trong lin kt i do chuyn v n v ti lin kt k gy ra Tnh cc h s rik :

.

rvw = rwv = 0 ( do cc b tr i xng nn xi = 0)

Trong :E modun n hi ca cc ly gn ng bng modun n hi ca b tng lm cc

Sau khi gii h phng trnh trn ta c kt qu sau:Bng 22: Tnh cc h s ca h phng trnh chnh tc.rvvFi (m4)Ln (m)cos2isin2iFi/L(Mi )*cos2

P10.78545100.0238

P20.78545100.0238

P30.78545100.0238

P40.78545100.0238

P50.78545100.0238

P60.78545100.0238

P70.78545100.0238

P80.78545100.0238

ruuFi/LNisin2iFi/LNi *sin2icos2 iJi/L3(Mi )*cos2

P10.02380010.00014311

P20.02380010.00014311

P30.02380010.00014311

P40.02380010.00014311

P50.02380010.00014311

P60.02380010.00014311

P70.02380010.00014311

P80.02380010.00014311

rwwx2icos2isin2iJi/ L(Mi )x2*Fi/LNi *cos2

P156.250100.0071.33875

P214.063100.0070.33469

P30.000100.0070.00000

P414.063100.0070.33469

P556.250100.0071.33875

P656.250100.0071.33875

P714.063100.0070.33469

P856.250100.0071.33875

ruw=rwucosisinicos*Ji/L2Mixi (m)x*sincosFi/LNI

P1100.00100185.40

P2100.00100181.80

P3100.0010018-1.80

P4100.0010018-5.40

P5100.0010018-5.40

P6100.0010018-1.80

P7100.00100181.80

P8100.00100185.40

Thay vo h phng trnh v gii h ta c :

Tnh ni lc tng cc Lc dc trc hng th (i) tnh theo cng thc :

Lc ct ca hng th (i) tnh theo cng thc :

Momen un ln nht u cc th (i) tnh theo cng thc :

Mi = Bng 23: Kt qu tnh ton lc dc trc trong mngSTTYiNiQiMTnMDnNn x Xn

15.42392.70.0-7.3-7.317945.3

21.82300.30.0-7.3-7.38626.1

3-1.82207.90.0-7.3-7.30.0

4-5.42115.50.0-7.3-7.3-7933.1

5-5.42023.10.0-7.3-7.3-15173.1

6-1.82392.70.0-7.3-7.317945.3

71.82300.30.0-7.3-7.38626.1

85.42023.10.0-7.3-7.3-15173.1

Tng22078.90.0-72.6-72.66930.4

Kim tra li theo iu kin cn bng lc theo cc phng v cn bng momen :

Ta c : -Tnh cho trng hp dc cuTi trng tnh ton:

H phng trnh chnh tc xc nh chuyn v ti y b l:

u,v, : chuyn v ngang , chuyn v thng ng , gc quay ca b quang im O (trng tm h to tnh ton ti y b) rik : phn lc trong lin kt i do chuyn v n v ti lin kt k gy ra Tnh cc h s rik :

.

rvw = rwv = 0 ( do cc b tr i xng nn xi = 0)

Trong :E modun n hi ca cc ly gn ng bng modun n hi ca b tng lm cc

Sau khi gii h phng trnh trn ta c kt qu sau:Bng 24: Tnh cc h s ca h phng trnh chnh tc.rvvFi (m4)Ln (m)cos2isin2iFi/L(Mi )*cos2

P10.78545100.0238

P20.78545100.0238

P30.78545100.0238

P40.78545100.0238

P50.78545100.0238

P60.78545100.0238

P70.78545100.0238

P80.78545100.0238

ruuFi/LNisin2iFi/LNi *sin2icos2 iJi/L3(Mi )*cos2

P10.02380010.00014311

P20.02380010.00014311

P30.02380010.00014311

P40.02380010.00014311

P50.02380010.00014311

P60.02380010.00014311

P70.02380010.00014311

P80.02380010.00014311

rwwx2icos2isin2iJi/ L(Mi )x2*Fi/LNi *cos2

P14.000100.0070.09520

P24.000100.0070.09520

P34.000100.0070.09520

P44.000100.0070.09520

P54.000100.0070.09520

P64.000100.0070.09520

P74.000100.0070.09520

P84.000100.0070.09520

ruw=rwucosisinicos*Ji/L2Mixi (m)x*sincosFi/LNI

P1100.00100181.80

P2100.00100181.80

P3100.00100181.80

P4100.00100181.80

P5100.0010018-1.80

P6100.0010018-1.80

P7100.0010018-1.80

P8100.0010018-1.80

Thay vo h phng trnh v gii h ta c :

Tnh ni lc tng cc Lc dc trc hng th (i) tnh theo cng thc :

Lc ct ca hng th (i) tnh theo cng thc :

Momen un ln nht u cc th (i) tnh theo cng thc :

Mi = Bng 25: Kt qu tnh ton lc dc trc trong mngSTT XiNiQiMTnMDnNn x Xn

11.8809.3361.81147.1-1385.51618.6

21.8809.3361.81147.1-1385.51618.6

31.8809.3361.81147.1-1385.51618.6

41.8809.3361.81147.1-1385.51618.6

5-1.8-809.3361.81147.1-1385.51618.6

6-1.8-809.3361.81147.1-1385.51618.6

7-1.8-809.3361.81147.1-1385.51618.6

8-1.8-809.3361.81147.1-1385.51618.6

Tng0.03618.011470.7-13855.316185.7

Kim tra li theo iu kin cn bng lc theo cc phng v cn bng momen :

Ta c : Tng hp hai trng hp li ta c kt qu ni lc trong u cc vi gi tr ni lc vi TTGH cng 1 nh sau:STTNiQxiQyiMyiMxi

13202.0361.80.01147.1-7.3

23109.6361.80.01147.1-7.3

33017.2361.80.01147.1-7.3

42924.8361.80.01147.1-7.3

52832.4361.80.01147.1-7.3

61583.4361.80.01147.1-7.3

71491.0361.80.01147.1-7.3

81213.8361.80.01147.1-7.3

Tng22078.93618.00.011470.7-72.6

Tng t ta tnh ton cho TTGH SD. Ta c:Ti trng tc dng ln h cc theo phng ngang

Bng 26: Ni lc cc theo phng ngang cuSTTYiNiQiMTnMDnNn x Xn

15.41620.611.033.6-43.412154.3

21.81557.711.033.6-43.45841.3

3-1.81494.811.033.6-43.40.0

4-5.41431.911.033.6-43.4-5369.7

5-5.41369.011.033.6-43.4-10267.7

6-1.81620.611.033.6-43.412154.3

71.81557.711.033.6-43.45841.3

85.41369.011.033.6-43.4-10267.7

Tng14948.0110.0335.6-434.44716.6

Ti trng tc dng ln h cc theo phng dc

Bng 27: Ni lc cc theo phng dc cuSTTXiNiQiMTnMDnNn x Xn

11.8543.0222.3698.1-858.01086.0

21.8543.0222.3698.1-858.01086.0

31.8543.0222.3698.1-858.01086.0

41.8543.0222.3698.1-858.01086.0

5-1.8-543.0222.3698.1-858.01086.0

6-1.8-543.0222.3698.1-858.01086.0

7-1.8-543.0222.3698.1-858.01086.0

8-1.8-543.0222.3698.1-858.01086.0

Tng0.02223.06980.6-8580.410859.6

Bng 28: Tng hp ni lc cc theo 2 phng ng vi trng thi gii hn s dngSTTNiQxiQyiMyiMxi

12163.6222.311.0698.133.6

22100.7222.311.0698.133.6

32037.8222.311.0698.133.6

41974.9222.311.0698.133.6

51912.0222.311.0698.133.6

61077.6222.311.0698.133.6

71014.7222.311.0698.133.6

8951.8222.311.0698.133.6

Tng14948.02223.0110.06980.6335.6

1.3.11.Kim ton cc-Kim tra sc chu ti ca cc.So snh ta thy trng thi gii hn cng

Do cc m bo kh nng chu lc.-Kim ton cng nn t ti v tr mi ccXc nh kch thc khi mng qui c

Gc m c tnh theo cng thc:

Trong

l gc ma st trong ca t nn c tnh trung bnh cho cc lp t:

l gc ma st trong ca cc lp tli chiu dy ca cc lp t tng ng

-Theo phng dc cu:

-Theo phng ngang cu:

Trong :a: khong cch tim gia hai hng cc theo phng dc cu a = 4.0 mn: s hng cc theo phng dc cu, n = 2d ng knh cc, d = 1.2 mLc chiu su cc ngm trong t, Lc = 45 mb khong cch tim gia hai hng cc theo phng ngang cu b = 3.6 mm s hng cc theo phng ngang cu m = 4Thay s vo tnh ta c:

Din tch mng khi quy c c tnh theo cng thc:

Momen khng un theo phng ngang cu:

Momen khng un theo phng dc cu:

Xc nh kh nng chu ti ca t nn di mi ccSc chu ti tnh ton ca t nn theo QPXD 45-78 c tnh nh sau:

Trong :m1, m2 ln lc l h s lm vic ca nn t v h s iu kin lm vic ca cng trnh tc ng qua li vi nn t c chn theo bng 1.22 (Nn mng, Chu Ngc n)m1 = 1.1m2 = 1ktc h s tin cy, ly bng 1 i vi cc c trng tnh ton ly t th nghim.A, B, D gi tr sc chu ti, ly ng vi gc ma st trong ca t nn l 23o52: A = 1.447; B = 6.318; D = 8.983Df chiu su chn mng Df = 33 m

trng lng n v th tch ca t t y mng tr xung,

trng lng n v th tch ca y mng tr ln mt t

b b rng khi mng qui c b = 9.44 mc lc dnh n v ca t di y mng, c = 0 kN/m2Vy sc chu ti ca t nn di mi cc l:

-Xc nh ng sut di y khi mng qui c.Trng lng th tch ca mng khi qui c

Trong :

trng lng n v trung bnh ca t t mi cc tr ln

: trng lng ring ca b tng : nc : s lng cc, nc = 10 cc

Fc : din tch tit din ngang ca cc Lc : chiu di cc : Lc = 45 m

Vqu : th tch khi mng qui c :

=> Chuyn ti trng v trng tm y mng qui c.-Ti trng thng ng tnh ton:

-Ti trng ngang tnh ton theo phng ngang cu,

-Ti trng ngang tnh ton theo phng dc cu:

-Momen tnh ton theo phng dc cu

-Momen tnh ton theo phng ngang cu:

-ng sut nn ln nht:

-ng sut nn nh nht:

-ng sut nn trung bnh:

-Kim ton ng sut di y mng.

-iu kin kim ton:

Thay vo ta c: vy tha iu kin kim ton-Kim tra ln ca cc.

-Ti trng thng ng tnh ton: Ptt lc thng ng ti y i c t hp trng thi gii hn s dng

Trng lng cc: -ng sut do ti trng thng ng gy ra di y khi mng qui c:

Ta chia t di mi cc thnh cc lp c chiu dy 1m tnh ln. bin dng trong tng lp c tnh theo cng thc:

Trong :Si: ln lp t phn t.hi : chiu dy lp phn t th i.

: ng sut ti v tr gia lp phn t do ti trng gy ln gy raNi (ba/30cm) : Tr s SPT c trng cho lp phn t.

: H s tnh t h s poison ca t theo cng thc sau:

( l h s Poisson)

Ta c th ly gn ng i vi t di y mng khi l t ct

: Modun bin dng ca t:

(T/m2) ln tng cng ca nn t di y mng c xc nh:

ln cho php ca cng trnh l:

(L l chiu di nhp tnh ton cu cu c tnh bng m, Ltt = 23.6m)Chiu su lp t tnh ln c xc nh ti v tr ng sut do ti trng bn thn ln hn 10 ln ng sut do ti trng ngoi gy ra.V s liu th nghim lp di y khi mng qui c khng di tnh ln nn ta xem nh lp cui cng su v hn.

: ng sut do ti trng bn thn t nn gy ra (T/m2)

: ng sut do ti trng gy ln gy raZi : su im tnh ng sut tnh t y mng khi quy c. (m)B : b rng y mng khi quy c. (m)K : h s ph thuc t s Z/B. : Trng lng ring y ni ca cc lp phn t. (T/m3)Bng 29: Tnh phn b ng sut trong t.STTB dyimh x

ZiZi/BKi

10.489.600.0000.000-----

0.489.64.6084.608-----

20.856.400.0004.608-----

0.856.45.44010.048-----

31.0110.500.00010.048-----

1.0110.510.60520.653-----

40.742.500.00020.653-----

0.742.51.85022.503-----

50.99> 9.000.00022.503-----

0.995.1515.09927.60200.0001.00011.1002.487

0.996.1510.99028.59210.1060.96110.6702.680

0.997.1510.99029.58220.2120.92310.2412.889

0.998.1510.99030.57230.3180.8639.5743.193

0.999.1510.99031.56240.4240.7918.7753.597

0.9910.1510.99032.55250.5300.7238.0254.056

0.9911.1510.99033.54260.6360.6677.4054.530

0.9912.1510.99034.53270.7420.6116.7855.090

0.9913.1510.99035.52280.8470.5556.1655.762

0.9914.1510.99036.51290.9530.5005.5456.585

0.9915.1510.99037.502101.0590.4555.0477.431

0.9916.1510.99038.492111.1650.4184.6448.288

0.9917.1510.99039.482121.2710.3824.2429.308

0.9918.1510.99040.472131.3770.3463.84010.541

Bng 30: Tnh lnZi(m)Hi(m)

0111.10010.885500.5638300.00159

110.670

1110.67010.456500.5638300.00153

210.241

2110.2419.908500.5638300.00145

39.574

319.5749.174500.5638300.00134

48.775

418.7758.400500.5638300.00123

58.025

518.0257.715500.5638300.00113

67.405

617.4057.095500.5638300.00104

76.785

716.7856.475500.5638300.00095

86.165

816.1655.855500.5638300.00086

95.545

915.5455.296500.5638300.00077

105.047

1015.0474.846500.5638300.00071

114.644

1114.6444.443500.5638300.00065

124.242

1214.2424.041500.5638300.00059

133.840

ln tng cng0.01383

ln tng cng ca cng trnh l: 1.38 cm < (cm)Vy iu kin v chuyn v tha mn.1.3.12.Thit k ct thp cho i ccXem i cc nh mt dm cng xn b ngm vo tr, tit din tnh ton i qua mp ct v b un bi cc phn lc u cc khng nm di chn trCc cnh tay n dng tnh mmen ln b.Thp t theo phng dc cu:-Thit k ct thp

Tit din tnh ton:Phn lc u cc trong giai on khai thc i vi nhm cc ngoi cng:

Ta c khong cch t trng tm nhm cc n mt ct xt l 1200 mm

-Sc khng un ca cu kin:

S dng hai lp thp c fy = 400 MPa.Khong cch t trng tm ct thp chu ko n mp chu nn l:

Din tch ct thp l: Chiu cao vng nn ca btng:

< 0.42-Mmen khng un danh nh:

Sc khng un:

Suy ra: . Vy tho mn iu kin chu un-Kim tra kh nng chu nt ca tit din-iu kin chu nt

( * )

Tit din tnh ton , = 1540 mm,

T s moun n hi:

Chiu dy lm vic ca btng sau khi b nt:

Ta ln lt tnh cc gi tr trong biu thc ( * ) :Tnh fs (ng sut trong thp do ti trng gy ra):

-Momen qun tnh ca tit din nt:

-Ta kim ton nt ca b cc theo phng ngang TTGH s dng nn phn lc u cc TTGH ny

-Do :

Tnh -Thng s vt nt : Z = 30000 N/mm-dc khong cch t trng tm ct thp chu ko ngoi cng n mp ngoi ca b tng chu ko v khng c ln hn 50 mm-Din tch trung bnh ca btng bao quanh mt thanh thp:

; vi

-Tnh

Vy: Tho iu kin chu nt Thp t theo phng ngang cu:c t ging thp b dc cu tin thi cng v gia cng ct thp.1.3.13.Kim tra chc thng i cc

Hnh 12: B ccThp xuyn thng b ccKh nng chu ct ca b tng i cc

kips (hnh 12.6 mc 11.3 - ACI 318-2002)Trong b0 chu vi dc theo tit din gii hn b0 = 942 cm = 371 ind chiu cao tnh ton ca mng d= 200 cm = 70.9 inVy kh nng chu ct ca b tng i cc l:

Vi Lc ct ln nht do cc tc dng ln b:

iu kin kim tra chc thng b cc:

Vy b cc m bo kh nng chu chc thng

CHNG 2: CU TO CHUNG KT CU NHP2.1. Cu to dm.

Hnh 13.1: Mt ct u dm gia Hnh 13.2: Mt ct gia dm gia

Hnh 14.1: Mt ct u dm bin Hnh 14.2: Mt ct u dm bin n tt nghip Trng i hc cng ngh Giao thng Vn ti

D inh Quang Huy 75 Lp 63DLCD - 07

Hnh 15: Mt chnh phin dm

Hnh 16: Mt bng phin dm gia

Hnh 17: Mt bng phin dm bin inh Quang Huy 81 Lp 63DLCD - 07

2.2. Lan can, tay vn

Hnh 18: Mt bng phin dm bin Hnh 18.1: Chi tit B Hnh 18.2: Mt ct I-I Hnh 18.3: Mt ct II-II

76

83 inh Quang Huy Lp 63DLCD - 07

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