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地震作用下钢筋混凝土桥墩塑性铰区抗剪强度试验

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Keywords: 桥梁工程,钢筋混凝土桥墩,拟静力试验,弯剪破坏,抗剪强度,塑性铰区

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Abstract:

?针对地震作用下钢筋混凝土桥墩塑性铰区剪切破坏模式,研究了抗剪强度计算问题。进行了12根钢筋混凝土短柱桥墩拟静力试验,在试验基础上比较了各国主要桥梁抗震设计规范中的桥墩抗剪强度计算公式。辅以太平洋地震工程研究中心(PEER)钢筋混凝土柱拟静力试验数据库,对地震作用下塑性铰区混凝土抗剪强度影响因素进行了统计分析,最后参考相关规范及研究成果提出了桥墩塑性铰区抗剪强度计算公式。结果表明:满足中国现行桥梁抗震设计规范最低配箍要求的钢筋混凝土短柱桥墩仍有很大可能发生塑性铰区的剪切破坏,宜引起足够重视。

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