一、前言目前,我国港工钢筋混凝土结构通用的设计方法是按弹性状态计算内力,按破损状态进行强度设计,二者在理论上是不协调的。实际上,结构在工作状态下,材料的应力应变关系往往超出弹性状态,尤当构件出现裂缝以后,以至于达到极限状态的破坏阶段时,由于内力 I. Introduction At present, the common design method of Hong Kong-made reinforced concrete structures in Hong Kong is to calculate the internal force according to the elastic state and to design the strength according to the damaged state. Both of them are theoretically uncoordinated. In fact, the structure in the working state, the material often stress-strain relationship beyond the elastic state, especially when the component cracks, so that the state reached the limit of destruction, due to internal forces