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Hollow core slab
5/1/2015 Prof Dr Ing Johannes Tarigan 1
Hollow cored slab = Pelat Berongga
Prof Dr Ing Johannes Tarigan 25/1/2015
Why use Precast Concrete Hollowcore Slab ?
Precast Concrete Hollowcore floors offer manyadvantages over alternative flooring methods likemetal deck, in-situ and timber.Prestressed Hollowcore floors are fast to erect and are agreat choice of flooring system for the construction of: Hotels Apartments Office Blocks Car parks Industrial Buildings
5/1/2015 3Prof Dr Ing Johannes Tarigan
Benefits of using Hollowcore Floor Slabs
Quick installation ensures a reduction in building programme time and site costs.
Eliminates the need for costly and time-consuming on-site concrete pours.
Eliminates on site formwork and steel fixing. Units can be grouted immediately after installation. Immediately stable floor platform suitable for working off. High load
capacity and long spans. Provides high levels of inherent fire resistance The hollow cores provide an excellent sound resistance. Manufactured offsite to rigorous quality standards. Progress on site is not weather dependant. Can be designed to incorporate notches, splays, balconies etc.
5/1/2015 4Prof Dr Ing Johannes Tarigan
Pre Tensioning
5/1/2015 Prof Dr Ing Johannes Tarigan 5
5/1/2015 Prof Dr Ing Johannes Tarigan 6
5/1/2015 7Prof Dr Ing Johannes Tarigan
5/1/2015 8Prof Dr Ing Johannes Tarigan
5/1/2015 9Prof Dr Ing Johannes Tarigan
5/1/2015 10Prof Dr Ing Johannes Tarigan
5/1/2015 11Prof Dr Ing Johannes Tarigan
5/1/2015 12Prof Dr Ing Johannes Tarigan
5/1/2015 13Prof Dr Ing Johannes Tarigan
Transfer :beban berat sendiri
Servis: saat beban bekerja (beban hidup)
5/1/2015 14Prof Dr Ing Johannes Tarigan
Akan dihitung beban hidup yang mampu di pikul, kabel di tengah
5/1/2015 15Prof Dr Ing Johannes Tarigan
300kg/m1
4 m
Mutu beton fc= 50 Mpa
Menghitung gaya Pra tegangB h d A A(ling) Anetto BJ Berat sendiri
1155 150 61 173,250.00 26,288.87 146,961.14 2500 367,402,837.50
1.155 0.15 0.061 0.17 0.02629 0.15 2500 367.40 kg/m
367.40 kg/m2
Berat kabel 67.4
300.00 kg/m2
q berat sendiri = 1.155 x 300.00 346.50 kg/m
q Beban hidup 115.50 kg/m
462.00 kg/m
M 924.01 kg m
f 21.45 kg/cm2
2.14 N/mm2
f P/A
P 315,219.98 N
5/1/2015 16Prof Dr Ing Johannes Tarigan
Pada saat Transfer Pada saat transfer
q (kg/m) L (m) M (kgm) B (cm) h(cm) Inertia (cm4) ya=yabW (momen tahanan) cm3
346.50 4 693.01 115.5 15 32484.375
6.1 175.2591
32309.1159 7.5 4307.88212
f (kg/cm2)f(N/mm2)
16.09 1.61
P N 315,219.98
A mm2 146,961.14
f(N/mm2) N/mm2 2.14
Akibat qbs Akibat P Total
f'c fa (1.61) (2.14) (3.75)
25 50 fb 1.61 (2.14) (0.54)
5/1/2015 17Prof Dr Ing Johannes Tarigan
Saat Transfer
ok
ok+1.61 N/mm2
-1.61N/mm2
-2.14N/mm2
-2.14 -3.75N/mm2
-0.54 N/mm2
5/1/2015 18Prof Dr Ing Johannes Tarigan
Pada saat servis
q (kg/m) L (m) M (kgm) B (cm) h(cm)Inertia (cm4) ya=yab W (momen tahanan) cm3
115.50 4 231.00 115.5 15 32484.38
6.1 175.2591
32309.12 7.5 4307.88212
f (kg/cm2)
f(N/mm2)
5.36 0.54
P N 315,219.98
A mm2 146,961.14 924.01
f(N/mm2) N/mm2 2.14 2.14 21.45
atas (2.14) fa (2.14) (4.29) =
bawah 2.14 fb (2.14) -
f'c
16.5 50
5/1/2015 19Prof Dr Ing Johannes Tarigan
2.14 N/mm2
-4.29 N/mm2
0
-2.14 N/mm2 - 2.14 N/mm2
-2.14 N/mm2 OK
Tdk ok
Saat servis
5/1/2015 20Prof Dr Ing Johannes Tarigan
-3.57 N/mm2
-25 Mpa
5/1/2015 21Prof Dr Ing Johannes Tarigan
Perhitungan jumlah kabel
Gaya pra tegang Zv 315,219.98 N
fy 1860N/mm2
A 169.47 cold down wire diam 5 19.6
n 8.65 9unit
5/1/2015 22Prof Dr Ing Johannes Tarigan
Pelat hollow dengan kabel di tengah
Pelat bisa memikul berat sendiri dan beban hidup 100 kg/m2
Gaya pra tegang 315,219.98 N dengan jumlah kabel 9 diam 5 mm.
5/1/2015 23Prof Dr Ing Johannes Tarigan
Akan dihitung beban hidup yang mampu di pikul, kabel di e= d/6 (kern)
5/1/2015 24Prof Dr Ing Johannes Tarigan
Gaya pra tegang
=
+2.14
+2.14
Pe/w
-P/A
- P/A
-Pe/w0
5/1/2015 25Prof Dr Ing Johannes Tarigan
Saat Transfer
=
-1,609 -1.155
-1.155 - 0,531 Mpa1,609
+0.985
-0.985
5/1/2015 26Prof Dr Ing Johannes Tarigan
Saat servis
=
-2,14 -1.155
-1.155 -0 Mpa2,14
+0.985
-0.985
-2.131
5/1/2015 27Prof Dr Ing Johannes Tarigan
Pelat hollow dengan kabel di e=d/6
Pelat bisa memikul berat sendiri dan beban hidup sebesar 100 kg/m2
Gaya pra tegang 16.973 ton=169,730 N
5/1/2015 28Prof Dr Ing Johannes Tarigan
Kesimpulan
Kabel di tengah Kabel di e=d/6
Zv= 315 kN Zv=169 kN
Beban hidup yang dapat dipikul 100 kg/m2
Kabel 10 diam 15 mm
Beban hidup yang dapat dipikul 100 kg/m2
5/1/2015 29Prof Dr Ing Johannes Tarigan
5/1/2015 30Prof Dr Ing Johannes Tarigan
5/1/2015 31Prof Dr Ing Johannes Tarigan
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5/1/2015 36Prof Dr Ing Johannes Tarigan