界限受压区高度εb
混凝土等级CXX
钢筋等级fcu,k=fck Es fy β1α1εcu'εcu εb HPB300
13.42100002700.810.003670.00330.576HRB335
20.12000003000.810.003600.00330.550HRB400
26.82000003600.810.003530.00330.518HRB500
32.42000004350.810.003480.00330.482HPB300
2100002700.790.990.003450.00330.569HRB335
2000003000.790.990.003450.00330.543HRB400
2000003600.790.990.003450.00330.511HRB500
2000004350.790.990.003450.00330.476HPB300
2100002700.780.980.003420.00330.561HRB335
2000003000.780.980.003420.00330.536HRB400
2000003600.780.980.003420.00330.505HRB500
2000004350.780.980.003420.00330.470HPB300
2100002700.770.970.003390.00330.554HRB335
2000003000.770.970.003390.00330.529HRB400
2000003600.770.970.003390.00330.498HRB500
2000004350.770.970.003390.00330.464HPB300
2100002700.760.960.003360.00330.547HRB335
2000003000.760.960.003360.00330.523HRB400
2000003600.760.960.003360.00330.492HRB500
2000004350.760.960.003360.00330.458HPB300
2100002700.750.950.003330.00330.540HRB335hpb300
2000003000.750.950.003330.00330.516HRB400
2000003600.750.950.003330.00330.485HRB500
2000004350.750.950.003330.00330.452HPB300
2100002700.740.940.003300.00330.533HRB335
2000003000.740.940.003300.00330.509HRB400
2000003600.740.940.003300.00330.479HRB500
2000004350.740.940.003300.00330.446说明
当C<50时，α1=1.0εb=β1/[1+fy/(Es*εcu)]Es=2.0*10^5
Es=2.1*10^550≤C≤80《混规》6.2.7条有屈服点普通钢筋《混规》6.2.1-5
《混规》6.2.6条
C混凝土等级6038.5εcu=0.0033-(fcu,k-50)×10^-5β1=0.8-[（C-50）/（80-50）]×（0.8-0.74）α1=1.0-[（C-50）/(80-50)]×（1.0-0.94）7547.48050.2混凝土受压区高度εb求解
20~506541.57044.55535.5

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