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在役钢筋混凝土连续刚构桥梁抗震性能评估

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Keywords: 桥梁工程,在役桥梁,增量动力分析法,抗震性能评估,材料耐久性

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Abstract:

?为了分析材料耐久性劣化对结构抗震性能的影响,针对遭受氯离子侵蚀的钢筋混凝土连续刚构桥,提出在役桥梁结构的抗震性能评估方法。应用菲克第二定律,得到损伤混凝土、锈蚀钢筋力学性能随时间的衰减规律;应用Min概率分布函数,得到针对桥梁结构的地震危险性曲线方程;应用IDA增量动力分析法,得到损伤构件和结构整体的地震易损性曲线和风险性曲线,完成结构的抗震性能评估。研究结果表明:得到的材料耐久性损伤劣化规律易于工程应用;桥梁结构与建筑结构相比,地震危险性曲线公式相差一个常数0.301;在相同地震作用下,桥墩纵桥向的易损性大于横桥向,结构系统的易损性和风险性均大于构件;结构发生同等损伤程度的易损性和风险概率均随服役时间而增大。

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