梁承载力验算

MAUNSELL,,,,,,,PROJECTNO.,,,

CONSULTANTSASIALTD.,,,,,,,DATE,15-1月-04,SHEET,

,,,梁承载力检算,,,,BY,,CHKD,

,,,,,,,,,,,

,1.设计参数：,,,,,,,,,

,弯矩设计值：,,M=,1200,KN.m,,,,,

,剪力设计值：,,V=,1000,KN,,,,,

,梁宽：,,b=,800,mm,,,,,

,梁高：,,h=,1000,mm,,,,,

,保护层厚度：,,cover=,50,mm,,,,,

,混凝土强度等级,,,C30,,,,,,

,混凝土抗压强度设计值：,,fc=,14.3,N/mm2,,,,,

,混凝土抗拉强度设计值：,,ft=,1.43,N/mm2,,,,,

,纵筋抗拉强度设计值:,,fy=,300,N/mm2,,,,,

,箍筋抗拉强度设计值:,,fyv=,210,N/mm2,,,,,

,钢筋弹性模量：,,Es=,200000,N/mm2,,,,,

,混凝土极限压应变：,,εcu=,0.0033,,,,,,

,系数：,,α1=,1.0,,,,,,

,,,β1=,0.8,,,,,,

,,,βc=,1.0,,,,,,

,,,,,,,,,,,

,2.正截面承载力验算：,,,,,,,,,

,有效高度:,,h0=,937.5,mm,,,,,

,,,αs=M/α1fcbh02=,0.119,,,,,,

,,,ξ=1-√（1-2*αs）=,0.127,,≤,ξb=,0.550,,

,,,梁仅需配受拉纵筋,,,,,,,

,受压区高度：,,x=ξh0=,119.5,mm,,,,,

,,,as'=,60.0,mm,,,,,

,需配受压钢筋面积：,,As'=(M-α1fcbx(h0-x/2)/fy'(h0-as')=,,,,,,,

,,,=,0,mm2,,,,,

,实配受压钢筋：,,,,,,,,,

,,第一排：,0,φ,20,+,0,φ,16,

,,,,,,,As’=,0,mm2,

,,第二排：,0,φ,16,+,0,φ,16,

,,,,,,,As’=,0,mm2,

,,,As’=,0,mm2,,,,,

,需配受拉钢筋面积：,,As=α1fcbx/fy+As'=,4557,mm2,,,,,

,选用钢筋排数,,n=,1,,,,,,

,实配的受拉钢筋：,,,,,,,,,

,,第一排：,10,φ,25,+,0,φ,0,

,,,,,,,As=,4909,mm2,

,,第二排：,0,φ,32,+,0,φ,0,

,,,,,,,As=,0,mm2,

,,第三排：,0,φ,0,+,0,φ,0,

,,,,,,,As=,0,mm2,

,实配受拉钢筋面积：,,As=,4909,mm2,,OK!,,,

,受拉钢筋配筋率：,,ρ=,0.61,%,,,,,

,受拉钢筋最大配筋率：,,ρmax=,2.46,%,,OK!,,,

,,,,,,,,,,,

,3.受剪承载力验算：,,,,,,,,,

,,,h0/b=,1.171875,,,,,,

,,,0.25βc*fc*b*h0=,2681.3,KN,≥,V=,1000,KN,OK!

,,,0.7*ft*b*h0=,750.75,KN,＜,V=,1000,KN,

,则:,,梁需要配箍筋,,,,,,,

,,,,,,,,,,,

,,,Asv/s=,(V-0.7*ft*b*h0)/(1.25*fyv*h0),,,,,,

,,,=,1.01,,,,,,

,如果箍筋间距：,,s=,300,mm,,,,,

,则箍筋面积为:,,Asv=,304,mm