中文摘要：

以ANSYS软件为平台,在充分考虑混凝土与钢筋界面滑移影响的基础上,建立不同锈蚀率下钢筋混凝土简支梁模型,以此来分析锈蚀钢筋混凝土简支梁的承载力变化。采用SOLID65单元模拟混凝土,LINK8单元模拟钢筋,Combine39模拟钢筋-混凝土界面的粘结滑移关系,并通过对Combine39单元进行修正来考虑钢筋锈蚀对钢筋与混凝土之间粘结力降低的影响,同时考虑钢筋锈蚀造成的钢筋截面减少和屈服强度降低这3种因素,计算不同锈蚀率下钢筋混凝土简支梁的承载力。结果表明：随着锈蚀率的增加,梁的刚度降低、钢筋与混凝土之间的相对滑移增大、裂缝向跨中靠近、承载力明显降低并由延性破坏向脆性破坏转变。

英文摘要：

Based on the Bond-slip between the steel bars and concrete,the FE models of RC simply supported beam in different corrosion ratios were built by ANSYS software for analyzing the load bearing capacity of corroded RC simply supported beam.The elements of SOLID 65,LINK 8 and Combine 39 were used to simulate concrete,steel bar and bond-slip between bars and concrete respectively.The effect of corrosion ratio on bonding force between bars and concrete was simulated by adjusting the parameter of Combine 39.Besides,the load bearing capacities of RC simply supported beam in different corrosion ratios were calculated considering the area reduction of bar＇s section and decrease of yield strength.The results show that with corrosion ratio increasing,the stiffness of beam decreased,the slip between bars and concrete increased,the cracks propagated to mid-span,the load bearing capacity obviously decreased,and ductile failure turned to brittle failure.