Bab Iii Plat.docx

BAB III Desain Plat Desain plat ditinjau dari plat yang memiliki luasan paling besar, seperti pada gambar :

Arah Bondek Arah Bondek Arah Bondek

Tinjauan Perhitungan Gambar 3.1 Tinjauan Perhitungan Plat

Sehingga diperoleh bentang plat (l) sebesar = 6.675/2 = 3.3375 m 3.1.Data Perencanaan

Gambar 3.2 Plat Bondek yang Digunakan

Tebal plat beton

= 120 mm

f'c

= 25 MPa

fy (plat bondek)

= 550 MPa

fy (Tulangan)

= 400 MPa

As (Luasan Plat Bondek)

= Ketebalan x 1000 = 0.9 x 1000 = 900 mm2

3.2.Pembebanan yang Bekerja 

Beban Mati (Dead Load) NO

JENIS BEBAN

BEBAN

1.1 kN/m2

1

Keramik + Spesi

2

Ducting

0.19 kN/m2

3

Plafon

0.05 kN/m2

4

Floordeck

Berat Jenis Beton

SUMBER

SATUAN

12.48 kg/m2

(ASCE 7-10 Table C31, Ceramic or quarry tile (19mm) on 25mm mortar bed (ASCE 7-10 Table C31, Mechanical Duct Allowance) (ASCE 7-10 Table C31, Acoustical Fiberboard) User Guide Lysaght Bondek

= 2400 kg/m3 x 0.12 m = 288 kg/m2



Beban Hidup (Live Load) Perpustakaan



= 718 kg/m2

Kombinasi Pembebanan (1.2D + 1.6L) Comb

= 1.2D + 1.6L = 1.2 (434.48) + 1.6(718) = 1670.176 kg/m2



Momen Maksimum (Mu) Mu

= 1/8 x q x l2 = 1/8 x 1670.176 x 3.33752 = 2325.492 kgm/m = 2325.492 kgm/m x 1 m = 2325.492 kgm = 23254917.356 Nmm

3.3.Detailing Plat Bondek

Gambar 3.3 Dasar Deatailing Plat Bondek

Dicoba menggunakan Tulangan D16 – 200



Sumbu Netral (a) = =

𝐴𝑠 𝑥 𝑓𝑦 0.85 𝑥 𝑓 ′ 𝑐 𝑥 𝑏 900 𝑥 550 0.85 𝑥 25 𝑥 1000

= 23.294 mm 

Ts (Bondek)

= As x fy = 900 x 550 = 495000 N



Z

=h–½a = 120 – ½ (23.294) = 108.353 mm



Tsr (Tulangan)

= As x fy = [5 x (0.25 x 3.14 x (162)] x 400 = 401920 N



d1

= h – tinggi bondek – 20 – ½ (a) – ½ (d) = 120 – 54 – 20 – ½ (23.294) – ½ (16) = 26.353 mm



Mn

= Kapasitas Bondek + Kapasitas Tulangan = (Ts x Z) + (Tsr x d1) = (495000 x 108.353) + (401920 x 26.353) = 64226480 Nmm

Mn = 64226480 Nmm > Mu = 23254917.356 Nmm (AMAN) Sehingga penulangan D16 – 200 dapat digunakan.