近海大气环境下考虑锈蚀的不同剪跨比RC框架梁抗震性能试验

为了研究近海大气环境下锈蚀RC框架梁的抗震性能，采用人工气候加速腐蚀方法对8榀剪跨比分别为2.6和5（λ=2.6和λ=5）的RC框架梁进行腐蚀试验，进而进行拟静力试验，研究锈蚀程度和剪跨比对RC框架梁抗震性能的影响。结果表明:随着钢筋锈蚀程度的增加，RC框架梁破坏时剪切变形所占的比例增大，破坏过程更加迅速，延性更差。另外，随着钢筋锈蚀程度的增加，RC框架梁的强度、变形能力和耗能能力都逐渐降低，尤其是对剪跨比较小的框架梁，降低幅度更大。因此，钢筋锈蚀对剪跨比较小的RC框架梁抗震性能影响更加严重。同时，该文拟合出锈蚀RC框架梁延性系数、功比指数及累积耗能与剪跨比和锈蚀率之间的关系曲线，为锈蚀劣化RC框架梁抗震性能的定量分析提供理论依据。

ASEISMIC PERFORMANCE TEST OF RC FRAME BEAMS CONSIDERING CORROSION WITH DIFFERENT SHEAR SPAN RATIO IN THE COASTAL ATMOSPHERE

In order to study the aseismic performance of corroded RC frame beams in coastal atmosphere, the accelerated corrosion test of 8 RC frame beams with shear span ratio being 2.6 and 5 were conducted by applying the technique of artificial climate accelerated corrosion, and the quasi-static test were then carried out to research the effect of corrosion degree and shear span ratio on the aseismic behavior of RC frame beams. The analytical results show that with the increase of the degree of corrosion, the more proportion of shear deformation of the specimens would be brought out in the damage state, and that the damage process would be more rapid and the ductility would be worse. In addition, with the increase of the degree of corrosion of the reinforcement, the strength, the deformation capacity and energy dissipation capacity of RC frame beams would be gradually reduced, especially for the frame beams with small shear span ratio. Therefore, the effect of reinforcement corrosion on the small shear span ratio was more serious. Meanwhile, the relationship between ductility coefficient, power ratio index and cumulative energy dissipation and shear span ratio and corrosion rate of corroded RC frame beams was fitted, which provides a theoretical basis for quantitative analysis of aseismic performance of corroded RC frame beams.