从加荷至破坏,横截面始终保持一平面 Ia-抗裂验算依据 I-裂缝和变形验算依据. ·IIa-受弯正截面承载力验算依据 配筋率:p=Abh b ho截面有效高度ho=h-a 0 h as s从加荷至破坏，横截面始终保持一平面 • Ia-抗裂验算依据. • II-裂缝和变形验算依据. • IIIa-受弯正截面承载力验算依据. 配筋率: =As /bh0 h0—截面有效高度 ho=h- as As h as ho b