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{"sheet":"钢筋和混凝土指标","index":0,"n_rows":29,"n_cols":15,"rows_kept":29,"merged":[[0,0,0,3],[0,5,0,14],[1,2,1,3],[5,2,5,3],[13,0,13,3],[18,0,18,3],[25,0,25,3]],"flags":["formulas_cached_only"]}
["钢筋和混凝土指标",{"$nulls":4},"混凝土强度及弹性模量"]
["C",25,"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＝",11.9,"(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]
["ft＝",1.27,"(N/mm2)","混凝土抗拉强度设计值 ft",null,"ft","N/mm2",1.1,1.27,1.43,1.57,1.71,1.8,1.89,1.96]
["Ec＝",28000,"(N/mm2)","混凝土弹性模量 Ec",null,"Ec","N/mm2",25500,28000,30000,31500,32500,33500,34500,35500]
["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]
["Es＝",200000,"(N/mm2)",null,null,"Es","N/mm2",210000,200000,200000]
["α1＝",{"v":1,"d":"1.00"},null,"1.0<C50<内插<C80<0.94"]
["β1＝",{"v":0.8,"d":"0.80"},null,"0.8<C50<内插<C80<0.74"]
["ξb＝",0.55,null,"ξb＝β1/(1+fy/0.0033Es)"]
["αE＝",{"v":7.142857142857143,"d":"7.14"},null,"αE＝Es/Ec"]
[]
["梁截面尺寸"]
["b＝",300,"(mm)","梁宽度 b"]
["h＝",600,"(mm)","梁高度 h"]
["ca＝",35,"(mm)","梁保护层厚度 ca"]
["h0＝",565,"(mm)","梁有效高度 h0=h-ca"]
["纵向钢筋：3φ20"]
["N＝",3,null,"纵筋根数 N"]
["φ＝",20,"(mm)","纵筋直径 φ"]
["As＝",{"v":942.477795,"d":"942"},"(mm2)","纵筋面积 As=N*(Pi*φ^2/4)"]
["ρ＝",{"v":0.005560340973451328,"d":"0.56%"},null,"纵筋配筋率 ρ=As/(b*h0)"]
["ρmax",{"v":0.021816666666666668,"d":"2.18%"},null,"最大配筋率 ρmax=ξb*(α1*fc)/fy"]
["ρmin",{"v":0.002,"d":"0.20%"},null,"最小配筋率 ρmin=max(0.45ft/fy,0.2%)"]
["注意：ρmin<ρ<ρmax，将继续计算！"]
["ξ＝",{"v":0.14017666319625197,"d":"0.140"},"(mm)","相对受压区高度 ξ=ρ*fy/(α1*fc)"]
["x＝",{"v":79.19981470588236,"d":"79"},null,"受压区高度 x=ξ*h0"]
["Mu＝",{"v":148.55337624323872,"d":"148.55"},"(kN-m)","支座抗弯承载力 Mu"]