地震作用下先简支后桥面连续梁桥支座损伤分析

Bearing Damage Process Analysis of Simply-Supported Bridges with Continuous Slab-decks

先简支后桥面连续梁桥是我国当前大量应用的一种桥梁结构形式。现采用Sap2000有限元软件建立了梁桥的非线性动力模型;根据支座损伤指标,采用IDA方法进行梁桥支座的损伤分析。计算结果表明,连接墩支座损伤比中间墩支座损伤要大,且场地越软弱越容易发生支座破坏,建议对于三四类场地加大支承长度。

The simply-supported bridge with continuous slab-decks is widely used at present as a form of bridge structure .This paper establishes the nonlinear bridge dynamic model by Sap 2000 finite element software . According to the bearing damage criterion , IDA analysis method is adopted for the bridge bearing damage process analysis .The calculation results show that the connection pier bearing damage is bigger than the middle pier bearing damage , and weaker is the site , more prone is the bridge to bearing damage .It is suggested that bearing length should be increased for bridge piers at Class Three or Four sites .