内容介绍：b (mm) h (mm) as=as' (mm) fcft α 1 fy=fy' As' (mm2) M (kN.m) ξ bαξ1000 12025 11.9 1.27 1.00 300 016 0.550 0.149 0.162x (mm)ρρ min As (mm2)15.4 0.64% 0.20% 6111000 40056 11.9 1.27 1.00 300 053 0.550 0.