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基于性能的中等跨径混凝土斜拉桥抗震风险分析

Keywords: 桥梁工程,中等跨径斜拉桥,增量动力分析,地震风险分析,快速非线性分析

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Abstract:

?为促进基于性能的概率性抗震评估方法在中等跨径混凝土斜拉桥中的应用,以一实际工程为例,建立了有限元动力分析模型.结合快速非线性分析(FNA)和增量动力分析(IDA)的优点,从PEER强震数据库中选取13条远场地震波进行快速增量动力分析(FNIDA),采用非参数统计方法形成了16%,50%和84%三种概率水平的IDA分位曲线.基于桥址处的地震危险性曲线建立了算例桥梁的概率地震风险评估曲线,并根据《公路桥梁抗震设计细则》对其抗震性能和抗震风险进行了分析.研究结果表明:FNIDA方法能很好地解决传统IDA方法在斜拉桥抗震分析中计算量大和耗时多的缺点;纵桥向地震作用下支座最易破坏,横桥向地震作用下挡块最易破坏,且塔底截面横桥向的抗震能力也有待加强;所提出的概率性风险评估曲线可直接用于斜拉桥结构的抗震性能评估.

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