圆形钢筋混凝土桥墩抗震性能(Ⅱ):试验结果评估

Seismic Performance of Circular Reinforced Concrete Bridge Columns(Ⅱ):Evaluation of Experimental Results

根据桥墩拟静力正交试验现象及数据结果,研究了圆形钢筋混凝土桥墩的变形特征及弯曲强度特性;并对低周反复荷载作用下桥墩的位移延性、等效刚度和刚度退化性能以及极限位移状态下累积耗能能力进行了评估,综合考察了剪跨比、轴压比、纵筋率、配箍率等因素对桥墩延性性能的影响。可为桥梁的延性抗震设计提供参考。

According to the failure phenomenon and test data in the orthogonal quasi-static test,the characteristics of deformation and flexural strength of circular reinforced concrete bridge columns are studied.And the displacement ductility,effective stiffness,stiffness degradation and capacity of accumulative energy dissipation to ultimate displacement state of bridge columns subjected to low-cyclic loading have been evaluated,so as to investigate the influence of factors such as shear-span ratio,axial-load ratio,and longitudinal reinforcement ratio and spiral reinforcement ratio on ductility performance of bridge columns.Finally,some useful conclusions are found out for the ductile anti-seismic design of highway bridges.