某城市天桥减隔震设计研究

通过对某城市天桥进行非线性动力分析,计算结果表明固定墩墩底弯矩远大于自由墩墩底弯矩,且固定墩墩底弯矩已经超越桥墩结构抗力。针对这一问题,为了使桥墩均匀地承受地震作用,提高结构抗震性能,文章采取了将固定墩的固定支座改为减隔震支座的设计方案,并对不同减隔震支座的屈服力和屈服前刚度进行了计算,分析了各工况下的地震响应,最后建议了选用支座的型号。

Research on Seismic Design for Overline Bridge

In this paper,the nonlinear dynamic analysis of a city bridge is carried out;the calculation results show that the bending moment of the fixed pier bottom is far greater than that of the bottom of the free pier,and the bending moment of the fixed pier bottom has surpassed the structure resistance of the pier.To solve this problem,in order to make the pier bear the earthquake action and improve the seismic performance of the structure,a design scheme that changed the fixed support of the fixed piers to the isolation bearing is adopted.The yield force and yield stiffness of different isolation bearings are calculated,and the seismic responses under different working conditions are analyzed.Finally,the type of support is recommended.