板式樓梯配筋計算書

1、樓 梯 計 算 書板式樓梯配筋計算書說明：xxxxxxxxx中學(xué)現(xiàn)澆板式樓梯，樓梯平面布置圖如下：層高3.600米踏步尺寸150mmx300mm。采用混凝土強度等級C25,鋼筋為級。樓梯上均布活荷載標(biāo)準(zhǔn)值q=3.5KN/m2.(1)樓梯板計算板傾斜度 tg=150/300=0.5 cos=0.894設(shè)板厚h=130mm,約為板斜長的1/30.取1m寬板帶計算1）荷載計算荷載分項系數(shù) g=1.2 q=1.4梯段板的荷載荷載種類荷載標(biāo)準(zhǔn)值（KN/m)恒載水磨石面層三角形踏步斜 板板底抹灰（0.3+0.15)x0.65x1/0.3=0.9751/2x0.3x0.15x25x1/0.3=1.880.1

2、3x25x1/cos=3.6350.02x17x1/cos=0.380小 計6.87活 載3.5基本組合的總荷載設(shè)計值 p=6.87x1.2+3.5x1.4=13.144KN/m2)截面設(shè)計板水平計算跨度Ln=3.3m彎矩設(shè)計值 M=1/8pLn2=1/8x13.144x3.32=17.892KN.m h0=130-20=110mm s=M/fcmbh02=17.892x106/11.9x1000x1102 =0.124 查表得s=0.933 As=M/sfyh0=17.892x106/0.933x210x110 =830.17mm2 選12125 As=904mm2 分布筋8，每級踏步下一根

3、(2)平臺板計算 設(shè)平臺板厚h=100mm,取1m寬板帶計算。平臺板的荷載荷載種類荷載標(biāo)準(zhǔn)值（KN/m)恒載水磨石面層100厚混凝土板板底抹灰0.650.1x25=2.50.02x17=0.34小 計3.49活 載3.51)荷載計算總荷載設(shè)計值 p=1.2x3.49+1.4x3.5=9.088KN/m2)截面設(shè)計板的計算跨度 L0=2.220-0.2/2+0.12=2.24m彎矩設(shè)計值 M=1/8pL02=1/8x9.088x2.242=5.70KN.m h0=100-20=80mm s=M/fcmbh02=5.70x106/11.9x1000x802 =0.0748 查表得s=0.9611

4、As=M/sfyh0=5.7x106/0.9611x210x80 =353.02mm2 選8125 As=402mm2(3)平臺梁(TL-1)計算 設(shè)平臺梁截面 b=200mm h=350mm平臺梁的荷載荷載種類荷載標(biāo)準(zhǔn)值（KN/m)恒載梁 自 重梁側(cè),梁底粉刷平臺板傳來梯段板傳來0.2x(0.35-0.1)x25=1.250.02(0.35-0.1)x2x17+0.2.x0.02x17=0.2383.49x2.1/2=3.66456.87x3.3/2=11.3355小 計16.488活 載3.5x(3.3/2+2.1/2)=9.451)荷載計算總荷載設(shè)計值 p=1.2x16.488+1.4x

5、9.45=33.0156KN/m2)截面設(shè)計梁的計算跨度 L0=1.05Ln=1.05x(4.2-0.37)=4.0215m內(nèi)力設(shè)計值 M=1/8pL02=1/8x33.0156x4.02152=66.743KN.m V=1/2pLn=1/2x33.0156x3.83=15.806截面按倒L形計算 bf=b+5hf=200+5x100=700mm h0=350-35=315mm s=M/fcmbh02=66.743x106/11.9x700x3152 =0.08075 查表得s=0.9577 As=M/sfyh0=66.743x106/0.9577x300x315 =737.47mm2選用鋼筋 選318 As=763.5mm2斜截面受剪承載力計算配置箍筋6200則 Vcs=0.07fcbh0+1.5fyvAsvh0/s =0.07x11.9x200x365+1.5x210x2x28.3/200 =60898.145N15806N 滿足要求配箍率sv=