高墩刚构桥系梁抗震分析

为研究系梁对高墩刚构桥抗震性能的影响,以系梁设置位置、系梁与桥墩截面刚度比以及系梁模拟方式为基本参数,通过分析结构动力特性及地震响应的变化,研究系梁对结构抗震性能的影响。研究结果表明：设置系梁后,桥梁的横桥向抗震性能降低,桥墩和系梁均成为抗震设计的薄弱环节;从提高结构整体抗震性能的角度出发,在墩中设置系梁效果最优,其中系梁与桥墩截面刚度比取0.5效果最优;系梁端部出现塑性铰后,对结构抗震性能的影响很小,可预先将系梁设计为与墩身铰接,以兼顾静力性能、动力性能和稳定性要求。

Seismic analysis of tie beam of rigid frame bridge with high pier

Seismic analysis was done to investigate the influence of tie beam to seismic performance of rigid frame bridge with high pier.Choosing the set location of tie beam,stiffness ratio of tie beam and pier’s section,and simulation methods of tie beam as the three basic parameters,the influence of tie beam to the structure earthquake resistance performance was studied through analyzing the changes of the dynamic performance and the earthquake responds.The results show that the transverse seismic performance of bridge is decreased by tie beam,while pier and tie beam become the weak link of seismic design.On the point of getting relatively better seismic performance of the whole structure,the set location of tie beam at the middle of pier is the best way,while stiffness ratio of tie beam and pier’s section is chosen as 0.5.The tie beam have little impact on seismic performance when plastic hinge occurred at its end,the tie beam can be pre-designed to articulate with pier to meet the requirements of static performance,dynamic performance and stability.