b (mm) h (mm) as=as' (mm) fc ft α1 fy=fy' As' (mm2) M (kN.m) ξb α ξ x (mm) ρ ρmin As (mm2) 1000 120 25 11.9 1.27 1.00 300 0 16 0.550 0.149 0.162 15.4 0.64% 0.20% 611 1000 400 56 11.9 1.27 1.00 300 0 53 0.550 0.038 0.038 13.2 0.15% 0.00% 524 250 400 40 14.3 1.43 1.00 300 0 60 0.550 0.130 0.139 50.1 0.66% 0.21% 597 1400 2000 65 19.1 1.71 1.00 300 0 12000 0.496 0.120 0.128 247.8 0.82% 0.26% 22086 200 300 40 25.05 2.355 1.00 405 0 66.7 0.496 0.197 0.221 57.6 1.37% 0.26% 712 1000 450 45 28.65 2.565 1.00 405 0 176 请输入 0.037 0.038 15.5 0.27% 0.29% 1154 b (mm) h (mm) a=a' (mm) fc ft α1 fy=fy' As' (mm2) M (kN.m) ξb α ξ x (mm) ρ ρmin As (mm2) C20 9.6 1.10 1 ξb (C20~C50) 求ξb β1 fy Es εcu C25 11.9 1.27 1 210 HPB235 0.614 0.496 0.8 405 2.0 0.0033 C30 14.3 1.43 1 300 HRB335 0.550 C35 16.7 1.57 1 360 HRB400 0.518 C40 19.1 1.71 1 360 RRB400 0.518 C45 21.1 1.80 1 C50 23.1 1.89 1 。