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工程力学  2014 

罕遇地震下曲线钢-混凝土组合梁桥的墩柱扭转效应

Keywords: 钢-混凝土组合结构,纤维梁模型,扭转效应,罕遇地震,有限元

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Abstract:

为了研究曲线钢-混凝土组合梁桥在罕遇地震下的墩柱扭转效应,基于考虑扭转效应的钢管混凝土纤维梁模型,建立了曲线组合梁桥的杆系有限元分析模型。对不同输入方向的三条地震波作用下是否考虑墩柱扭转效应的纤维梁模型的计算结果进行了对比,包括墩顶位移、墩柱扭转角和墩柱内力等。在此基础上,对曲线组合梁桥在罕遇地震作用下的扭转效应的关键影响参数进行了分析。结果表明:采用考虑扭转效应的纤维梁模型分析曲线组合梁桥在地震作用下的受力反应,可有效的反映罕遇地震下曲线钢-混凝土组合梁桥的墩柱扭转效应。另外,曲率半径和墩高是影响曲线组合梁桥在纵向地震作用下墩柱扭转效应的主要因素。

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