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近场地震作用下支座布置对连续梁桥的抗震性能影响分析

DOI: 10.13197/j.eeev.2015.04.155.wuwp.018, PP. 155-163

Keywords: 桥梁工程,近场地震,时程分析,板式橡胶支座,铅芯橡胶支座,恢复力机制

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Abstract:

针对我国中小跨径混凝土连续梁桥的4种传统支座布置以及目前常用的5种新型支座布置形式,以一典型四跨连续梁桥为例,分别建立有限元模型并输入7组近场实测地震动,然后进行非线性动力分析。研究了在近场强震作用下不同的支座布置形式对主梁位移、支座和桥墩变形的影响,探讨了各类传统支座布置形式存在的问题,以及新型支座布置形式在改善桥梁抗震性能方面的优势。分析结果表明,近场强震作用下传统支座布置形式难以同时保证梁体位移和桥墩受力的合理性,尽管直接搁置的板式橡胶支座能大大减小桥墩受力,但在近场脉冲激励下会导致主梁产生不可恢复的滑移;采用铅芯橡胶支座的新型支座布置形式能有效协调梁体位移和桥墩受力,减小桥梁整体的破坏概率。

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