中文摘要：

对锈蚀钢筋混凝土梁的延性特征展开研究,结合48根梁（32根锈蚀梁和12根对比试验梁）的试验数据,在平截面假定不再成立的前提下,回归分析得出不同锈蚀程度的梁在钢筋屈服和极限状态时钢筋与混凝土的应变关系,通过此应变关系得到锈蚀梁在钢筋屈服和极限状态时受压区高度的计算表达式,从而得到了锈蚀梁曲率延性系数的计算模型;根据计算模型,绘制不同锈蚀程度梁的M-φ曲线,并分析了不同锈蚀程度梁的延性变化特征及原因。

英文摘要：

The ductility of a corroded reinforced concrete（RC） beam was investigated.On the condition that the plane cross-section assumption is no longer tenable,the relation between the strain of reinforcement and concrete of beams with different corroded levels in yield state and ultimate state was conjectured based on the regression analysis of the experimental data of 48 beams（32 corroded beams and 12 contrasted beams）.Through the strain relation,the computation expression of the compressive height of corroded beam in both yield and ultimate state and the computation model of the curvature ductility factor of corroded beam was deduced.And then based on this computation model,the M-φ curve of beams with different corroded levels was drawn and the characteristic and reason of the change in ductility was discussed.