罕遇地震下简支梁桥墩延性抗震分析

Seismic Ductility Analysis of Simply Supported Girder Bridge Pier under Rare Earthquake

桥墩的延性设计是提高桥梁结构抗震能力的一个重要方面。其功能主要在于保证结构在构件屈服后仍具有充足的变形能力,屈服部分发生延性破坏,进而避免结构发生脆性破坏和整个桥梁结构的倒塌。文章以国外某高速铁路区间大曲线半径双线32 m简支梁桥为研究对象,基于纤维模型的基本原理建立该桥的弹塑性分析模型,并进行罕遇地震下桥梁弹塑性地震时程响应分析及抗震延性计算,探索了低配筋率下简支梁桥墩的抗震性能,为今后的设计提供参考。

Ductility design of pier plays an important role in bridge seismic capacity which would provide enough deformability after the structure yielded,the ductile failure of the yielded part may prevent brittle failure even collapse of the bridge structure. This article studies a 32 m simply supported girder bridge on some high speed railway abroad,building elastic-plasticity analyzing model of the bridge according to the fiber-based model theory,and doing the seismic time history response analysis and ductility calculation of the bridge under rare occurrence earthquake. Seismic performance of the pier in low reinforcement ratio is also researched in this article,which would provide experience in the future design.