减隔震支座对不同墩高桥梁地震反应的影响

Effects of Isolation Bearing on Seismic Responses of Beam Bridge with Different Pier Heights

以一座连续梁桥为例,采用有限元程序SAP2000,对其减隔震体系以及常规体系进行非线性动力时程分析,研究了不同墩高下减隔震支座对桥梁地震反应的影响,并与常规体系进行了比较。分析结果表明,在墩高较小时,减隔震支座可以显著的降低结构内力响应,改善结构的抗震性能,而在墩高较高时,减隔震支座的减震效果不明显。

In this paper, the nonlinear dynamic responses of a continuous beam bridge with seismic isolation and one with regular bearing, were analyzed by using the finite element program SAP2000. During analyses, effects of isolation bearing on seismic responses of beam bridge with different pier heights were considered. Responses of the bridge with isolation bearing were compared with the one using regular bearing. The results showed that the use of isolation bearing improves the anti-seismic performance of bridge. The internal forces of pier substantially decreased for the low pier.