M=95kn/m fy=360kn/mfc=14.3n/mm2 α1=1 b=250mm c=20mmh=550mm ho=530mmαs=M/α1*fc*b*ho=0.0946 ξ=1-(1-2αs)^1/2= 0.0996 As=α1*fc*b*ξ*ho/fy= 523.99mm2 实配3根16
