重型车辆与桥梁耦合振动及桥梁冲击系数的数值模拟研究

发布时间：2018-06-28 18:56

本文选题：车-桥耦合振动 + 冲击系数　；参考：《结构工程师》2014年05期

【摘要】：为了更合理地评估桥梁在重型车辆作用下的耦合动力响应,在有限元软件LS-DYNA的平台上,根据车桥振动实验数据,建立了具有11个自由度的3轴重型车辆和桥梁上部结构的车桥耦合系统有限元模型。对桥梁模型进行了模态分析,并对车桥耦合振动的三个工况进行了数值模拟,所得结果与实测数据一致,验证了有限元模型的合理性、可靠性。进一步利用该有限元模型进行车桥耦合体系参数分析,选择了车辆运行速度,桥梁桥台搭板的沉降以及桥梁跨度进行桥梁冲击系数的参数敏感性研究。参数分析结果表明:冲击系数整体上随车辆速度的增大而增大,同时有局部极大值的存在;冲击系数随桥台搭板沉降量的增大而增大;冲击系数呈现随桥梁跨度的增大而增大的趋势。
[Abstract]:In order to more rationally evaluate the coupling dynamic response of bridge under the action of heavy vehicles, the finite element model of the bridge coupling system with 11 degrees of freedom 3 axle heavy vehicles and the bridge superstructure is established on the platform of the finite element software LS-DYNA, based on the experimental data of the bridge vibration, and the modal analysis is carried out on the bridge model and the vehicle is carried out. The numerical simulation of the three conditions of bridge coupling vibration is carried out. The results are in agreement with the measured data, and the rationality and reliability of the finite element model are verified. The parameters of the bridge coupling system are analyzed by the finite element model. The speed of the vehicle, the settlement of the bridge abutment and the span of the bridge and the bridge impact system are selected. The parameter analysis shows that the impact coefficient increases with the increase of vehicle speed, and there is a local maximum, and the impact coefficient increases with the increase of the abutment plate settlement, and the impact coefficient increases with the increase of the span of the bridge.
【作者单位】：同济大学结构工程与防灾研究所;
【基金】：科技部国家重点实验室基金项目(SLDRCE10-B-07)
【分类号】：U441.3

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