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钢管混凝土系杆拱桥车桥耦合振动分析

Keywords: 车桥耦合,钢管混凝土,系杆拱桥,动力放大系数

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Abstract:

为了研究钢管混凝土系杆拱桥在车辆荷载作用下的动力冲击效应,综合采用包括空间梁、板和杆单元的桥梁结构有限元模型和三维7自由度车辆模型,通过数值模拟车、桥动力相互作用,计算得到桥梁的位移、内力响应及对应动力放大系数,研究桥梁不同构件所受到的动力冲击作用及主要影响因素,分析桥梁不同位置加速度响应的频谱特征.结果表明,桥梁局部构件的动力冲击系数常超过规范取值,且路面不平度是最主要的影响因素;长、短吊杆的动力冲击系数差异很大,短吊杆的受力和抗疲劳性能远低于长吊杆.

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