Upload
cong-minh
View
232
Download
0
Embed Size (px)
Citation preview
8/10/2019 Thuyt Minh Tnh Ton Coppha
1/20
Thuyt minh tnh ton coppha2.1.2 Tnh ton vn khun dmTnh vn khun dm c kch thc tit din bxh = 30x60 cm2.1.2.1 Tnh ton vn khun y dm
Vn khun y dm s d!n" vn khun kim #$%i& d'n" cc t(m )300x*+00,-c t./ #n cc th/nh 1 "2 n"/n" c/ h ch4n" y dm )1 n"/n"& 1 d5c& "i$78,9 :h;n" ch2 b< thiu h!t h$c c k> h? th@ d'n" "2 m v1$ A Bm bB$ h@nhd%n" c/ dm Cn" thDi tEnh b< chBy nc xi mFn" #1m Bnh h?n" n ch(t#-n" b tn" dm9
Ta c t hp vn khun dm chnh
Ldn
Mmax
q
Ldn Ldn Ldn Ldn
LdnLdnLdn
S tnh vn khun y dm
TBi tE5n" tc d!n" #n vn khun y dm "Cm cG
STT Tn t!i t"#n$ %n$ th&c n 'tc(da)*m2+ 'tt(da)*m2+
* TBi bBn thHn c4I Ih/ tc +*J 3Kd/: L m= *&* 3K M+9K
+ TBi tE5n" bBn thHnNTOT dm
tc
+ btct dJ h+P00Q0&6
= =
*&+ *P00 *R00
3TBi tE5n" d$ S btn"
bn" cn tE!ctc
3J M00= *&3 M00 P+0
MTBi tE5n" d$ m
btn"tc
MJ +00= *&3 +00 +60
8/10/2019 Thuyt Minh Tnh Ton Coppha
2/20
TSn" tBi tE5n" * + 3 MJ J J J J= + + + 21,- 222/- TSn" tBi tE5n" tnh t$n IhHn b4 tc d!n" #n vn y dm Jtt=)J*UJ+UJ3UJM,Q0&3=+6++&KQ0&3=R6&R d/:Lm+
a. Tnh ton khong cch x g theo iu kin bn:
U WiXu kin bXnG = MW
YQ)d/:Lcm+,9
TE$n" G Z=6&PP cm3[\m]n khn" u4n c/ vn khun& bX E^n" 300mm_
\ ` \ m]n tE$n" vn y dm \ =+Q
*0tt xg q l
*0 9xg
W Rl
q
=
+
*0Q6&PPQ+*00Q0&K*+P&M3
R6&RQ*0cm
=
Vay ch5n kh$Bn" cch "i;/ cc x1 "C n"/n" #1 #x"= 60cm9
b. Tnh ton khong cch x g theo !"ngUTBi tE5n" tiu chun tc d!n" #n vn khun tEn *m d1i
Jtc =R6&R
6PP&3 L*&+
#a$ m=
U W^ vn" c/ vn khun -c tnh th]$ cn" thcG e =MQ
*+RQ Q
tcq l
% &
U W^ vn" ch$ IhfIG [ ]*
QM00
' l=
[ ]
M
*+R 9 M00
tc
g gq l l
' '% & = =
6
33+
*+RQ Q *+RQ+&*Q*0 Q+R&M6*M+&RR
M00Q M00Q6PP&3Q*0g tc% &
l cmq
= =
TE$n" G g ` \ un 1n hCi c/ thfI_ g = +&*9*06 k"Lcm+9 ` \m]n Jun tnh c/ bX E^n" vn khun = +R&M6 cmM
t h-I + iXu kin tEn t/ ch5n #x"= 60 cm
2.1.2.2 Tnh ton vn khun thnh dm` Tnh t$n vn khun th1nh dm th.c ch(t #1 tnh kh$Bn" cch cHy ch4n"
xin c/ th1nh dm& Bm bB$ ch$ vn th1nh khn" b< bin d%n" Ju #n di tcd!n" c/ I #.c b tn" khi m S9
` ju/n nim vn khun th1nh dm #1m vic nh m^t dm #in t!c Xu nh
8/10/2019 Thuyt Minh Tnh Ton Coppha
3/20
#uatt bac nh(t& c "i tE< )nQQhd,9 WA n "iBn tE$n" tnh t$n t/ ch$ I #.c IhHn
b4 Xu tEn t$1n b^ chiXu c/$ th1nh dm9 OhiXu c/$ #1m vic c/ th1nh dm9 h = 0&6 ` 0&*P = 0&MP cm9
:h vay s> -c "hfI t + t(m vn b= +Pcm v1 b=+0cm9
` TBi tE5n" tc d!n" #n vn th1nh dm b/$ "Cm9U oI #.c c/ btn"G
J*=n QQ bdQhdTE$n" G n =*&3 #1 h s4 ^ tin cay
= +P00 d/:Lm3 #1 dun" tE5n" Ein" c/ b tn"
J*= *&3 Q +P00Q 0&3Q 0&6 = PRP d/:LmU oI #.c S btn"G J+= n Q IdQ hd
TE$n" G p s4 ^ tin cayG n =*&3 I #.c S btn" Id= M00 d/:Lm+ J+= *&3 Q M00Q 0&6 =3*+ d/:Lm
TSn" tBi tE5n" IhHn b4 tc d!n" #n vn th1nh dm #1G Jtt= J*U J+= PRP U 3*+ = RK d/:Lm
Ltt
Mmax
Ltt Ltt Ltt
LttLttLttLtt
q
q C tnh vn khun th1nh dma. Tnh ton khong cch n() *ng theo iu kin bn
8/10/2019 Thuyt Minh Tnh Ton Coppha
4/20
` WiXu kin bXnG =M
WYQ d/:Lcm+
TE$n" G Z ` \m]n khn" u4n c/ t(m vn th1nh_Z = M&PU M&3 = R&R cm3
\ ` \m]n tEn vn th1nh dm_ \ =+
Q*0
nq l
*0Q Q Qn#
tt
W Rl
q
=
*0QR&RQ+*00Q0&K*36&
R&Kcm=
b. Tnh ton khong cch n() *ng theo iu kin !"ngUTBi tE5n" tiu chun tc d!n" #n vn khun tEn *m d1iG
Jtc =RK
M&P L*&+
#a$ m=
U W^ vn" c/ vn khun -c tnh th]$ cn" thcG e =
M
Q*+RQ Q
tc
q l% &
U W^ vn" ch$ IhfIG [ ]*
QM00
' l=
[ ]M
*+R 9 M00
tc
n# n# q l l' '% &
= =
6
33+
*+RQ Q *+RQ+&*Q*0 Q+R& M6*36&
M00Q M00QM&PQ*0n# tc% &
l cmq
= =
TE$n" G g ` \ un 1n hCi c/ thfI_ g = +&*9*06 k"Lcm+9
` \m]n Jun tnh c/ bX E^n" vn khun = +R&M6 cmM
t h-I + iXu kin tEn t/ ch5n #nd= *+0 cm
2.1.2.3 Tnh ton ngang cho dm
l d
p
M =maxdp. l
4
an ngangan an
q
s t nh t o n ng ang
TBi tE5n" tc d!n" #n 1 n"/n" #1 t$1n b^ tBi tE5n" dm tE$n" din tEuyXn tBi c/n
8/10/2019 Thuyt Minh Tnh Ton Coppha
5/20
)din tEuyXn tBi #1 m^t kh$Bn" /n,9 N/$ "CmGU TBi tE5n" vn khun h/i th1nh dmG J*= +Q)*&*Q3KQ0&MP, = 3R&6* )d/:Lm,
U TE5n" #-n" vn khun y dmG J+= *&*Q3KQ0&3 =*+&R d/:Lm
3K d/:Lm+ ` #1 tBi tE5n" c/ *m+ vn khun dm9
U TE5n" #-n" b tn" c4t thfI dm d1y h =60 cm
J3= nQQhQb =*&+Q+P00Q0&6Q0&3 = PRP d/:Lm
U TBi tE5n" S btn" dmG JM= nQbQdTE$n" G p s4 ^ tin cayG n =*&3
p$%t tBi S btn" bn" cn tE!cG d= M00d/:Lm+
JM= *&3 Q M00Q 0&3 = *P6 d/:Lm
U TBi tE5n" m nfnG JP= nQbQJtc TE$n" G p s4 ^ tin cayG n =*&3
I #.c m nfn tiu chunG Jtc = +00 d/:Lm+
JP= *&3 Q0&3Q +00 = R d/:Lm
U TBi tE5n" thi cn"G J6 = nQbQtc TE$n" G p s4 ^ tin cayG n =*&3
h$%t tBi thi cn" tiu chunG tc= +P0 d/:Lm+ J6= *&3 Q 0&3Q+P0 = K&P d/:Lm
U TBi tE5n" bBn thHn 1 n"/n"G Jn= n QbQhQ "Q8TE$n" G p s4 ^ tin cayG n =*&*
run" tE5n" Ein" c/ "2 "=600 d/:Lm3
b& h #1 chiXu E^n" v1 chiXu c/$ c/ 1 n"/n"9 Oh5n )bh, = )R *0, cm J = *&*Q0&0RQ0&*Q600Q0&6 = 3&+ d/:TBi tE5n" tSn" c^n" tc d!n" #n 1 n"/n"Jtt=)J*UJ+UJ3UJMUJ6, /nUJn=)3R&6*U*+&RUPRPU*P6UK&P,Q0&6U3&+= P3&*K)d/:,TBi tE5n" tc d!n" #n 1 Jui vX #.c taI tEun"G
= JQ #na = P3&*KQ 0&6 = 3++&3* d/:
i tE< m$m]nG m/xQ
M
#+ lM = )d/:9cm,
T/ cG Z =+Q
6
b h=
+R9*0
6= *33&33 cm3
)b h, =)R *0, cm #1 tit din n"/n" c/ 1 n"/n"9
8/10/2019 Thuyt Minh Tnh Ton Coppha
6/20
a. Tnh ton theo iu kin bn
= [ ] [ ]m/x MQ Q QQ Q
QMtt #
#
W nM + ln l
W W +
= = d/:Lcm+
MQ*33&33Q*P0Q0&RP+*0&K
3++&3*#l cm =
b. Tnh ton theo iu kin !"ng:UTBi tE5n" tiu chun tc d!n" #n vn khun
tc =3++&3*
+6R&6*&+
#a$=
U W^ vn" c/ vn khun -c tnh th]$ cn" thcG3
m/x
Q
MRQ
tc#+ l'
%&=
U W^ vn" ch$ IhfIG [ ]*
QM00
' l=
[ ]3
m/x
Q MRQ Q
MRQ M00 M00Q
tc
tc
+ l l % &' ' l
%& + = =
P 3MRQ*&*Q*0 QRQ*0*R*
M00Q+6R&6Q*+l cm =
t h-I + iXu kin tEn t/ ch5n # = *+0 cm
=Vay chiXu d1i 1 n"/n" #1 *+0cm& kh$Bn" cch "i;/ cc th/nh 1 n"/n" #160cm92.1.2.4 Tnh ton dc cho dmTBi tE5n" tc d!n" #n 1 d5c )d$ 1 n"/n" tEuyXn xu4n" ,G
dd
3++&3**6*&*6) ,
+ +
#n)) #a$= = =
i tE< m$m]n #n nh(tG \ m/x= 0&*KQddQ N = 0&*KQ*6*&*6Q*&+ = 36&M)d/:9m,` TBi tE5n" bBn thHn 1 d5cG Oh5n )b h, = )6 R,cm
Jbt= 0&06Q 0&0RQ 600Q *&* = 3&* )d/:Lm,
\bt=+ +3&* *&+
0&MP6 9*0 *0
btq l #a$ m
= =
8/10/2019 Thuyt Minh Tnh Ton Coppha
7/20
1200
Mmax
P P P P P P P P P
1200 1200 1200
1200 1200 1200 1200
0nh v 3 S ch4u 56c c7a 8 d#c dm
` / tE< mm]n #n nh(t A tnh 1 d5c th]$ bXnG \m/x= \m/x*U\bt
\m/x= 36&M U 0&MP6 = 3&+ )d/:9m,
+ +
3Q 6QR 6M6 6
b hW cm = = =
U iAm tE/ khB nFn" ch
8/10/2019 Thuyt Minh Tnh Ton Coppha
8/20
2.1., Thit k vn khun 98n
2.1.3.1 Tnh ton vn khun sn
8/10/2019 Thuyt Minh Tnh Ton Coppha
9/20
:!n$ t!i t"#n$ tc d;n$ 5n 98n
STT Tn t!i t"#n$ %n$ th&c n 'tc(da)*cm2+ 'tt(da)*cm2+
* TBi bBn thHn c4I Ih/ tc +*J 3Kk L m= *&* 3K M+9K
+TBi tE5n" bBn thHn
NTOT s1n
tc
+ btct dJ h
+P00Q0&*P
=
=*&+ 3P MP0
3TBi tE5n" d$ S btn"
bn" cn tE!ctc
3J M00= *&3 M00 P+0
MTBi tE5n" d$ m
btn"tc
MJ +00= *&3 +00 +60
PTBi tE5n" d$ d!n" c!
thi cn"tc
PJ +P0= *&3 +P0 3+P
TSn" tBi tE5n" * + 3 M PJ J J J J J= + + + + 12< 1=->/-
S t hp vn khun 98n tn$ i?n hnh
U q1nG q d!n" cc t(m #$%iG 300*R00mm& +00x*+00mm& 300x*+00mm
8/10/2019 Thuyt Minh Tnh Ton Coppha
10/20
U Oh2 n1$ czn h? ch{n thm vn khun "2 d1y +0mm9
` Tnh kh$Bn" cch "i;/ cc 1 n"/n"& 1 d5c | vn khun s1nG
WA thuan tin ch$ vic thi cn"& t/ ch5n kh$Bn" cch "i;/ th/nh 1 n"/n"m/n" vn s1n # = 60cm& kh$Bn" cch #n nh(t "i;/ cc th/nh 1 d5c # =*+0cm
)bn" kch thc c/ "i$ 78,9T kh$Bn" cch ch5n tEc t/ s> ch5n -c kch thc Ih' h-I c/ cc th/nh
19Tnh t$n& kiAm tE/ ^ bXn & ^ vn" c/ vn khun s1n v1 ch5n tit din cc
th/nh 19iAm tE/ ^ bXn& ^ vn" ch$ m^t t(m vn khun s1nG
Ld
Mmax
q
Ld Ld Ld
LdLdLdLd
0nh v3 S ch4u 56c vn khun 98na. Tnh ton theo iu kin bn:
= MW
YQd/:Lcm+9
TE$n" G Z = 6&PPcm3 ` \m]n khn" u4n c/ t(m vn khun E^n" 300
\ ` \m]n tE$n" vn y s1n_ \ =+Q
*0#q -
*0Q Q Q#
tt
W Rl
q
=
*0Q6&PPQ+*00Q0&KRR&0+
*P&KKcm=
b. Tnh ton theo iu kin !"ng
UTBi tE5n" tiu chun tc d!n" #n vn khun tEn *m d1iGJtc= *+6Md/:Lcm+
U W^ vn" c/ vn khun -c tnh th]$ cn" thcG e =MQ
*+RQ Q
tcq l
% &
U W^ vn" ch$ IhfIG [ ]*
QM00
' l=
8/10/2019 Thuyt Minh Tnh Ton Coppha
11/20
[ ]M
*+R Q M00
tc
# #q l l
' '% &
= =
6
33+
*+RQ Q *+RQ+&*Q*0 Q+R&M6**M&R
M00Q M00Q*+6MQ*0# tc% &
l cmq
= =
TE$n" G g ` \ un 1n hCi c/ thfI_ g = +&*9*06 k"Lcm+9 ` \m]n Jun tnh c/ bX E^n" vn khun = +R&M6 cmM
/t h0) 1 iu kin t23n ta ch4n l#5 67 cm
2.1.3.2 Tnh ton kim tra thanh ngang
` Oh5n tit din th/nh x1 "C n"/n"G bh = R*0cm& "2 nhm V} cG
"2= *P0 kLcm+v1 g =*&*Q*0PkLcm+9
` TBi tE5n" tc d!n"GU ~1 "C n"/n" ch
8/10/2019 Thuyt Minh Tnh Ton Coppha
12/20
thi cn"
TSn" tBi tE5n" * + 3 M PJ J J J J J= + + + + 12< 1=->/-U TBi tE5n" bBn thHn 1 n"/n"G
J6= n Qb QhQ "TE$n" G
p s4 ^ tin cayG n =*&*
run" tE5n" Ein" c/ "2 "= 600 d/:Lm3
b& h #1 chiXu E^n" v1 chiXu c/$ c/ 1 n"/n"9 Oh5n bxh=Rx*0cm J6= *&*Q0&0RQ0&*Q600 = P&+R d/:Lm=TSn" tBi tE5n" IhHn b4 tc d!n" #n x1 "C #1G Jtt= )J*U J+U J3 UJM U JP,Q#nU J6 Jtt= )M+&KUMP0UP+0U+60U3+P,Q0&6U P&+R = K6M&0+ d/:Lm
= \m/x =+ +Q K&6MQ*+0
*3RR*&6 9*0 *0
tt +8-q , #a$ cm= =
T cn" thc G Z =+Q
6
b h=
+RQ*0
6= *33&33 cm3
= m/x*3RR*&6
*0M&***33&33
tt M
W = = = d/:Lcm+ w = *P0 d/:Lcm+
= Oh5n 1 n"/n" )R *0, #1 Bm bB$ khB nFn" ch
8/10/2019 Thuyt Minh Tnh Ton Coppha
13/20
2.1.3.3 Tnh ton kim tra thanh dc
Oh5n tit din th/nh 1 d5cG ch5n tit din bh = *0*+ cm "2 nhm V} cG
"2 = *P0 d/:cm+v1 g =*&*Q*0Pd/:Lcm+
` TBi tE5n" tc d!n" #n th/nh x1 "C d5cGU ~1 "C d5c ch
8/10/2019 Thuyt Minh Tnh Ton Coppha
14/20
tt= /x +6MRK
**0&3V+M0
mM
W= = d/:Lcm+ w = *P0kLcm+9
Th$B mn yu cu bXn
` iAm tE/ vn"G
U V@ cc tBi tE5n" taI tEun" t "n nh/u cch nh/u 0&6m& nn t/ c thA tnhbin d%n" c/ 1 d5c "n n" th]$ dm #in t!c Xu nh
8/10/2019 Thuyt Minh Tnh Ton Coppha
15/20
%Du tEo vn khun dm/ 98n
2.2 Tnh ton khFi 5Gn$ cn$ tc2.2.1 !h"i #$%ng cng tc &' tng (Tnh ton cho 1 tng in h)nh*
Tn"O(u kin
WVT ch thc )m,
q4#-n"
)ci,
h4i #-n"TSn"
TSn" c^ntn"8$%i hiu *c(u kin T$1n b^
3
O^t
O* m3 093Q09PQ3 ++ 09MP K9K
M09+R*
*P39R0O+ m3 093Q09Q3 +0 0963 *+96
O3 m3 09PQ09PQ3 M 09P 3Ohiu "h m3 +9+KQP9Q09* * *930P3 *930P3V th/n" * m3 +9+KQ393Q09* * 09PP 09PPVch th/n" m3 09+PQR9MRQ3 + 6936 *+9+
rm r* m3 093Q09MRQ90* +M *90* +M9+M 3K90K6r+ m3 09++Q09*RQ3 *+ 09*+ *9MM
8/10/2019 Thuyt Minh Tnh Ton Coppha
16/20
r3 m3 09++Q09+RQ39K M0 09+M K96rM m3 09++Q093RQP9 M 09MR *9K+rP m3 09*PQ09*RQ396 M 09* 09Mr6 m3 09*PQ09*RQP9R*P 3 09*6 09MR
V th/n" + m3 *9PMQ393Q09* + 09P0R+ *90*6M
q1n
* m3 696RQ396Q09*+ *6 +9RK M69+M
M9M+0
+ m3 396RQ+9RQ09*+ *0 *9+3 *+933 m3 M9M6Q396Q09*+ + *9K3 39R6M m3 P96RQP9+Q09*P * M9M3 M9M3P m3 P96RQ396Q09*+ + +9MP M9K6 m3 P9MRQM90K+Q09*+ * +96K +96K
2.2.2 !h"i #$%ng cng tc c"t th+, (Tnh ton cho 1 tng in h)nh*
Tn"O(ukin
hiu
8 Ein"k"Lm3,
8 NT* O )m3,
p1m#-n"),
q4#-n")ci,
h4i #-n")k", TSn")k",
TSn"c^n")T(n*c(u kin T$1n b^
3
O^t
O* RP0 09MP + ++ 096P *PPM93
+M*9
+09+O+ RP0 0963 + +0 KR9K* *KR9+
Ohiun"h
RP0 *930P3 *9P * *P396KK* *P396KK*
V th/n"*
RP0 09PP *9P * RR9KR36R RR9KR36R
O3 RP0 09P + M **9P M*VchTh/n"
RP0 6936 3 + *MK9R +KKP9P6
rm
r* RP0 *9+6 *9R +M *R903R M++9K*+
+*09*
r+ RP0 09+ *9R *+ +R9+6 33K9*+r3 RP0 093M *9R M0 MR90M+ *K+*96RrM RP0 0963 *9R M RK90*K 3P6906rP RP0 09*6 *9R M ++960R K09M3+r6 RP0 09+6 *9R 3 3693R **09+*M
V th/n"+ RP0 09P0R+ *9P + PK9RM0PP **K96R**
q1n * RP0 +9RK * *6 ++69R6P 36+K9RM PRM++ RP0 *9+3 * *0 K69PPP K6P9PP3 RP0 *9K3 * + *P*9P0P 30390*M RP0 M9M3 * * 3M9PP 3M9PPP RP0 +9MP * + *K+93+P 3RM96P
8/10/2019 Thuyt Minh Tnh Ton Coppha
17/20
6 RP0 +96K * * +**9*6P +**9*6P
2.2.3 !h"i #$%ng cng tc vn khun (Tnh ton cho 1 tng in h)nh*
Tn"
O(u kin Wn
v