C25强度类型fc=11.9(N/mm2)混凝土抗压强度设计值fckfcN/mm2ft=1.27(N/mm2)混凝土抗拉强度设计值ftftN/mm2Ec=28000(N/mm2)混凝土弹性模量EcEcN/mm2HRB335强度类型fy=300(N/mm2)纵筋抗拉压强度设计值fyfyN/mm2Es=200000(N/mm2)EsN/mm2α1=1.001.0C50内插C800.94β1=0.800.8C50内插C800.74ξb=0.55ξb=β1/(1+fy/0.0033Es)αE=7.14αE=Es/Ecb=300(mm)梁宽度bh=600(mm)梁高度hca=35(mm)梁保护层厚度cah0=565(mm)梁有效高度h0=h-caN=3纵筋根数Nφ=20(mm)纵筋直径φAs=942(mm2)纵筋面积As=N*(Pi*φ^2/4)ρ=0.56%纵筋配筋率ρ=As/(b*h0)ρmax2.18%最大配筋率ρmax=ξb*(α1*fc)/fyρmin0.20%最小配筋率ρmin=max(0.45ft/fy,0.2%)ξ=0.140(mm)相对受压区高度ξ=ρ*fy/(α1*fc)x=79受压区高度x=ξ*h0Mu=148.55(kN-m)支座抗弯承载力Mu钢筋和混凝土指标混凝土强度及弹性模量HRB(235,335,400)纵筋强度等级注意:ρminρρmax,将继续计算!梁截面尺寸纵向钢筋:3φ20C?(20,25,30,35,40,45,50,55)混凝土等级C20C25C30C35C40C45C50C559.611.914.316.719.121.123.125.31.11.271.431.571.711.81.891.962550028000300003150032500335003450035500HPB235HRB335HRB400210300360210000200000200000混凝土强度及弹性模量