梁承載力驗(yàn)算

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

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

,,,梁承載力檢算,,,,BY,,CHKD,

,,,,,,,,,,,

,1.設(shè)計(jì)參數(shù)：,,,,,,,,,

,彎矩設(shè)計(jì)值：,,M=,1200,KN.m,,,,,

,剪力設(shè)計(jì)值：,,V=,1000,KN,,,,,

,梁寬：,,b=,800,mm,,,,,

,梁高：,,h=,1000,mm,,,,,

,保護(hù)層厚度：,,cover=,50,mm,,,,,

,混凝土強(qiáng)度等級(jí),,,C30,,,,,,

,混凝土抗壓強(qiáng)度設(shè)計(jì)值：,,fc=,14.3,N/mm2,,,,,

,混凝土抗拉強(qiáng)度設(shè)計(jì)值：,,ft=,1.43,N/mm2,,,,,

,縱筋抗拉強(qiáng)度設(shè)計(jì)值:,,fy=,300,N/mm2,,,,,

,箍筋抗拉強(qiáng)度設(shè)計(jì)值:,,fyv=,210,N/mm2,,,,,

,鋼筋彈性模量：,,Es=,200000,N/mm2,,,,,

,混凝土極限壓應(yīng)變：,,εcu=,0.0033,,,,,,

,系數(shù)：,,α1=,1.0,,,,,,

,,,β1=,0.8,,,,,,

,,,βc=,1.0,,,,,,

,,,,,,,,,,,

,2.正截面承載力驗(yàn)算：,,,,,,,,,

,有效高度:,,h0=,937.5,mm,,,,,

,,,αs=M/α1fcbh02=,0.119,,,,,,

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

,,,梁僅需配受拉縱筋,,,,,,,

,受壓區(qū)高度：,,x=ξh0=,119.5,mm,,,,,

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

,需配受壓鋼筋面積：,,As'=(M-α1fcbx(h0-x/2)/fy'(h0-as')=,,,,,,,

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

,實(shí)配受壓鋼筋：,,,,,,,,,

,,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,,,,,

,需配受拉鋼筋面積：,,As=α1fcbx/fy+As'=,4557,mm2,,,,,

,選用鋼筋排數(shù),,n=,1,,,,,,

,實(shí)配的受拉鋼筋：,,,,,,,,,

,,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,

,實(shí)配受拉鋼筋面積：,,As=,4909,mm2,,OK!,,,

,受拉鋼筋配筋率：,,ρ=,0.61,%,,,,,

,受拉鋼筋最大配筋率：,,ρmax=,2.46,%,,OK!,,,

,,,,,,,,,,,

,3.受剪承載力驗(yàn)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,

,則:,,梁需要配箍筋,,,,,,,

,,,,,,,,,,,

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

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

,如果箍筋間距：,,s=,300,mm,,,,,

,則箍筋面積為:,,Asv=,304,mm