Hollow Kuliah

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.


Pre Tensioning


Transfer :beban berat sendiri

Servis: saat beban bekerja (beban hidup)


Akan dihitung beban hidup yang mampu di pikul, kabel di tengah


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


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)


Saat Transfer

ok

ok+1.61 N/mm2

-1.61N/mm2

-2.14N/mm2

-2.14 -3.75N/mm2

-0.54 N/mm2


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


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


-3.57 N/mm2

-25 Mpa


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


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.


Akan dihitung beban hidup yang mampu di pikul, kabel di e= d/6 (kern)


Gaya pra tegang

=

+2.14

+2.14

Pe/w

-P/A

- P/A

-Pe/w0


Saat Transfer

=

-1,609 -1.155

-1.155 - 0,531 Mpa1,609

+0.985

-0.985


Saat servis

=

-2,14 -1.155

-1.155 -0 Mpa2,14

+0.985

-0.985

-2.131


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


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


Hollow Kuliah

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