考虑屈曲约束支撑的桥梁排架墩抗震性能研究

Investigation on of Seismic Performance for Bridge Bents with Buckling-restrained Braces

为进一步提升桥梁双柱式排架墩抗震性能,本研究通过在排架墩中设置屈曲约束支撑对该体系抗震性能进行优化。首先构建与实际工程情况相符合的单个排架墩数值模型,并利用不同类型地震作用对其进行研究,在此基础上,进一步分析了屈曲约束支撑与排架墩刚度比、屈服位移比、屈曲约束支撑布置形式以及排架墩布置形式对其抗震性能的影响。研究结果表明:通过设定屈曲约束支撑可在一定程度上有效地降低排架墩地震损伤,对不同类型排架墩而言,设定屈曲约束支撑减震率范围为30%至80%。屈曲约束支撑与排架墩刚度比和屈服位移比建议取值的合理范围分别为0.5~2.0以及0.5~1.5。

In order to further improve the seismic performance of the double column bent pier,this study optimizes the seismic performance of the system by setting buckling restrained brace in the bent pier.Firstly,the numerical model of single bent pier which is consistent with the actual engineering situation is constructed,and different types of seismic actions are used to study it.On this basis,the influence of the rigidity ratio,yield displacement ratio,layout form of buckling restrained support and bent pier layout form on its seismic performance is further analyzed.The results show that the seismic damage of bent piers can be effectively reduced to some extent by setting buckling restrained braces.For different types of bent piers,the range of damping ratio of setting buckling restrained braces is 30%to 80%.The reasonable range of stiffness ratio and yield displacement ratio of buckling restrained brace to bent pier is 0.5~2.0 and 0.5~1.5 respectively.