pondasi
Post on 04-Oct-2015
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Design Pondasi
A. Data teknis
Gaya aksial Perlu/vertikal (Pu)=718.33kg
Gaya aksial Perlu/horizontal (Ph)=0kg
Momen perlu (Mu)=10kgm
f'c=22.5Mpa
fy=240Mpa
Lebar kolom (b)=150mm
dimensi Pondasi
Lebar pondasi (B)=500mm
Tebal pondasi (d)=100mm
B. Analisa
Berat tangki=2000kg
Berat minyak tanah=17430kg
Berat sendiri plat (t:10 cm)=2880kg
Berat total=22310kg
Daya dukung tanah + gelam=18000kg
Berat sisa (untuk satu kolom)=718.333kg
Data penyelidikan tanah
g (Wet density)=1.289t/m3
f(angle of internal friction)=4.5o
c(cohesion)=0.05kg/cm2
t (timbunan tanah merah)=0cm
Analisa Terzaghi
qult = 1,3.c.Nc.+q.Nq+0,4.g.B.Ng
Tabel Tersaghi untuk nilai :f,Nc,Nq,Ng
f=05
Nc=5.77.3
Nq=11.6
Ng=00.5
Untuk sudut geser (f)=4.5o
Nc=7.14
Nq=1.54
Ng=0.45
qult = 1,3.c.Nc.+q.Nq+0,4.g.B.Ng=0.466kg/cm2
SF ( safety factor)
=1.5
qa tanah = qult/SF
=0.311kg/cm2
Daya dukung gelamf10-600 =0.02kg/cm2
Rencana jumlah gelam=4bh
Daya dukung gelam totalf10-600 =0.08kg/cm2
qa tanah + gelam
=0.391kg/cm2=0.0391N/mm2
Pu/B^2 r =0.0105
r max =0.75*rb =0.2008
Lengan momen (a)=(Aperlu*fy)/(0.85*f'c*b)=13.1514
fMn =fAs*fy(d-0.5a)=9399233Nmm
=939.923kgm> Mu10kgmOk!
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