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["钢筋和混凝土指标",{"$nulls":4},"混凝土强度及弹性模量"]
["C",20,"C?(20,25,30,35,40,45,50,55) 混凝土等级",null,null,"强度","类型","C20","C25","C30","C35","C40","C45","C50","C55"]
["fc＝",9.6,"(N/mm2)","混凝土抗压强度设计值 fck",null,"fc","N/mm2",9.6,11.9,14.3,16.7,19.1,21.1,23.1,25.3]
["HRB",335,"HRB(235,335,400) 纵筋强度等级",null,null,"强度","类型","HPB235","HRB335","HRB400"]
["fy＝",300,"(N/mm2)","纵筋抗拉压强度设计值 fy",null,"fy","N/mm2",210,300,360]
[]
["钢管混凝土柱承载力计算"]
["Pi＝",3.14159265,null,"Pi=3.14159265"]
["l0＝",{"v":3.2,"d":"3.200"},"(m)","柱计算长度 l0"]
["dc＝",500,"(mm)","柱直径 dc"]
["t＝",10,"(mm)","钢管壁厚度 t"]
["φ＝",{"v":0.8218427660744588,"d":"0.822"},"长细比影响系数 φ=if(l0/dc>4,1-0.115sqrt(l0/dc-4),1)"]
["Aa＝",{"v":15707.96325,"d":"15707.96"},"(mm2)","钢管横截面积 Aa=Pi*dc*t"]
["Ac＝",{"v":196349.54062500002,"d":"196349.54"},"(mm2)","核心混凝土面积 Ac=Pi*dc^2/4"]
["θ＝",{"v":2.5,"d":"2.50"},null,"套箍系数 θ=(Aa*fy)/(Ac*fc)"]
["Nu＝",{"v":6447938.8105190545,"d":"6.448E+06"},"(N)","Nu=φ*fc*Ac*(1+2*sqrt(θ))"]