业之发住宅装饰装修工程施工及验收标准凤飞飞

C20强度类型fc＝9.6(N/mm2)混凝土抗压强度设计值fckfcN/mm2HRB335强度类型fy＝300(N/mm2)纵筋抗拉压强度设计值fyfyN/mm2Pi＝3.14159265Pi=3.14159265l0＝3.200(m)柱计算长度l0dc＝500(mm)柱直径dct＝10(mm)钢管壁厚度tφ＝0.822Aa＝15707.96(mm2)钢管横截面积Aa=Pi*dc*tAc＝196349.54(mm2)核心混凝土面积Ac=Pi*dc^2/4θ＝2.50套箍系数θ=(Aa*fy)/(Ac*fc)Nu＝6.448E+06(N)Nu=φ*fc*Ac*(1+2*sqrt(θ))钢管混凝土柱承载力计算钢筋和混凝土指标混凝土强度及弹性模量C?(20,25,30,35,40,45,50,55)混凝土等级HRB(235,335,400)纵筋强度等级长细比影响系数φ=if(l0/dc4,1-0.115sqrt(l0/dc-4),1)C20C25C30C35C40C45C50C559.611.914.316.719.121.123.125.3HPB235HRB335HRB400210300360混凝土强度及弹性模量