Pembesian Slab.docx

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Momen rencana lapangan Mu = 19.82 kNm Mutu beton : K - 290 Kuat tekan beton, fc' = 28.8 MPa Mutu baja : U - 400 Tegangan leleh baja, fy= 400 MPa Tebal slab beton, h= 240 mm Jarak tulangan terhadap sisi luar beton, d' = 30 mm Modulus elastisitas baja, Es = 200000 MPa Faktor bentuk distribusi tegangan beton, β1 = 0.85 ρb = β1*0.85*(fc'/fy)*600/(600+fy) = 0.031212 Rmax = 0.75*ρb*fy*[1-((1/2*0.75*ρb*fy)/(0.85*fc'))] = 7.572812 Faktor reduksi kekuatan lentur, φ = 0.8 Tebal efektif slab beton, d = h - d' = 210 mm Ditinjau slab beton selebar 1 m, b = 1000 mm Momen nominal rencana, Mn = Mu/φ = 24.775 kNm Faktor tahanan momen, Rn = (Mn*10^6) / (b*d^2) = 0.561791 Rn < Rmax (OK) Rasio tulangan yang diperlukan : ρ= 0.85*fc'/fy*[1-√1-((2*Rn)/(0.85*fc'))] = rasio tulangan minimum, ρmin = 25%*(1,4/fy) = Rasio tulangan yang digunakan, ρ = Luas tulangan yang diperlukan, As = ρ*b*d = Diameter tulangan yang digunakan, D Jarak tulangan yang diperlukan, s = [(π*D^2)/4]*b/As = Digunakan tulangan, D As = [(π*D^2)/4]*b/s = Tulangan bagi / susut arah memanjang diambil 50% tulangan pokok, As' = 50%*As = Diameter tulangan yang digunakan, Jarak tulangan yang diperlukan, Digunakan tulangan,

D s = [(π*D^2)/4]*b/As = D As = [(π*D^2)/4]*b/s =

0.001421 0.000875 0.001421 298.4047 mm^2 16 mm 673.4478 16 803.84 mm^2

250

401.92 mm^2 13 mm 330.0781 13 530.66 mm^2

250

Momen rencana tumpuan Mu = 37.1 kNm Mutu beton : K - 290 Kuat tekan beton, fc' = 28.8 MPa Mutu baja : U - 400 Tegangan leleh baja, fy = 400 MPa Tebal slab beton, h = 240 mm Jarak tulangan terhadap sisi luar beton, d' = 30 mm Modulus elastisitas baja, Es = 200000 MPa Faktor bentuk distribusi tegangan beton, β1 = 0.85 ρb = β1*0.85*(fc'/fy)*600/(600+fy) = 0.031212 Rmax = 0.75*ρb*fy*[1-((1/2*0.75*ρb*fy)/(0.85*fc'))] = 7.572812 Faktor reduksi kekuatan lentur, φ = 0.8 Tebal efektif slab beton, d = h - d' = 210 mm Ditinjau slab beton selebar 1 m, b = 1000 mm Momen nominal rencana, Mn = Mu/φ = 46.375 kNm Faktor tahanan momen, Rn = (Mn*10^6) / (b*d^2) = 1.051587 Rn < Rmax (OK) Rasio tulangan yang diperlukan : ρ= 0.85*fc'/fy*[1-√1-((2*Rn)/(0.85*fc'))] = rasio tulangan minimum, ρmin = 25%*(1,4/fy) = Rasio tulangan yang digunakan, ρ = Luas tulangan yang diperlukan, As = ρ*b*d = Diameter tulangan yang digunakan, D Jarak tulangan yang diperlukan, s = [(π*D^2)/4]*b/As = Digunakan tulangan, D As = [(π*D^2)/4]*b/s = Tulangan bagi / susut arah memanjang diambil 50% tulangan pokok, As' = 50%*As = Diameter tulangan yang digunakan, Jarak tulangan yang diperlukan, Digunakan tulangan,

D s = [(π*D^2)/4]*b/As = D As = [(π*D^2)/4]*b/s =

0.002688 0.000875 0.002688 564.4797 mm^2 16 mm 356.0092 16 803.84 mm^2

250

401.92 mm^2 13 mm 330.0781 13 530.66 mm^2

250

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