板式樓梯配筋計算介紹模板

1、板式樓梯配筋計算書時間：2021.03.01創(chuàng)作：歐陽語說明：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150mmx300mme采用混凝 土強度等級C25,鋼筋為I級。樓梯上均布活荷載標(biāo)準(zhǔn)值q = 3.5KN/m2.樓梯板計算 板傾斜度 tga=150/300=0.5 cosa二0.894 設(shè)板厚h二130mm,約為板斜長的1/30.取lm寬板帶計算1)荷載計算荷載分項系數(shù)Yg二12 Yq = l-4梯段板的荷載荷載種類荷載標(biāo)準(zhǔn)值 (KN/m)恒水磨石面層(0.3+0.15)x0.65x1/0.3=0.975三角形踏步1/2x03x0.15x25x1/0

2、.3=1.88斜板0.13x25xl/cos a =3.635載板底抹灰0.02xl7xl/cos a =0.380小計6.87活載3.5基本組合的總荷載設(shè)計值p 二 6.87xl.2 + 3.5xl.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 = l/8pLn2=l/8xl3.144x3.32=17.892KN.mho=130-20=110mmas=M/fcmbho2=17.892xlO6/H.9xlOOOxllO2=0.124查表得Ys二0.933As=M/Ysfyho=17.892xlO6/O.933x21OxllO=830.17mm2i(pl2125

3、 As=904mm2分布筋q8 #每級踏步下一根(2)平臺板計算設(shè)平臺板厚h = 100mm/取lm寬板帶計算。平臺板的荷載荷載種類荷載標(biāo)準(zhǔn)值 (KN/m)恒水磨石面層100厚混凝土板 板底抹灰0.650.1x25=2.50.02x17=0.34載小計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 = l/8pL02=l/8x9.088x2.242=5.70KN.mho=lOO-2O=8Ommas=M/fcmbho2=5.7OxlO6/H.9xlOOO

4、x8O2=0.0748查表得Ys二0.9611As=M/Ysfyho=5.7xlO6/O.9611x21Ox8O= 353.02mm2選(p8125 As=402mm2平臺梁(TLJ)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(035-0)x25=l250.02(0.35-0.1 )x2x 17+0.2.x0.02x 17=0.2383.49x2.1/2=3.66456.87x3.3/2=11.3355小計16.488活載3.5x(3.372+2.172)=9.451)荷載計算總荷

5、載設(shè)計值p=1.2xl6.488 + 1.4x9.45 = 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 = l/8pL02=l/8x33.0156x4.02152=66.743KN.mV=l/2pLn=l/2x33.0156x3.83=15.806截面按倒L形計算bf = b + 5hf=200+5xl00=700mm ho=35O-35 = 315mmas=M/fcmbho2=66.743xlO6/H.9x7OOx3152=0.08075查表得Ys二0.9577As=M/ysfyho=66.743xlO6/O.9577x3OOx315=737.47mm2選用鋼筋 選 3018 As=763.5mm2斜截面受剪承載力計算 配置箍筋46200則 Vcs=O.O7fcbho+1.5fyVAsvho/s=0.07x11.9x200 x365 + 1.5x210 x2x28.3/200 = 60898.145N15806N 滿足要求配箍率 psv=nxAsvi/bs=2x28.3/