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为研究大跨度铁路悬索桥在CRH2列车及风荷载作用下的振动响应，建立风-车-桥耦合振动分析系统模型。采用Fortran语言自编计算程序，通过设置不同风速及车速，深入分析多种工况下CRH2列车及风荷载作用下的桥梁振动响应。计算结果表明：大跨度铁路悬索桥的横向位移对风荷载有较强的敏感性；风及列车荷载共同作用时，风荷载对桥梁横向位移影响较大，车速对桥梁竖向位移影响相对较大；列车运行速度由0 km/h增至350 km/h时，桥梁主跨跨中挠度随风荷载的增加而减小，当列车车速由350 km/h提至400 km/h时，桥梁跨中挠度随风荷载的增加而增大；风荷载及列车速度对桥梁的振动响应均有较大影响，应在不同风速下控制列车速度以达到安全行车的目的。
Abstract：To study the vibration response of a large-span railroad suspension bridge under the action of CRH2 trains and wind loads, a wind-vehicle-bridge coupling system is established. By setting different wind velocities and different train speeds, the bridge vibration response under different operating conditions of CRH2 trains and wind loads is analysed in depth using a self-calculating program in Fortran language. The results show that: the lateral displacement of large span railroad suspension bridge is more sensitive to wind loads; when wind and train loads act together, the wind loads have a greater effect on the lateral displacement of the bridge, and the train speed has a relatively greater effect on the vertical displacement of the bridge; when the train speed increases from 0 km/h to 350 km/h, the vertical deflection of the main span of the bridge decreases with the increase of wind loads, and when the train speed varies from 350 km/h to 400 km/h, the deflection of the bridge span decreases with the increase of the wind loads. Wind loads and train speeds have a large impact on the vibration response of the bridge, and the train speed should be controlled at different wind speeds in order to achieve the purpose of safe traffic.
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基本信息:
DOI：10.19740/j.2096-9872.2024.03.10
中图分类号:U448.25
引用信息:
[1]王少钦,马仕杰,乔宏.风及CRH2列车荷载作用下大跨悬索桥振动响应分析[J].北京建筑大学学报,2024,40(03):86-93.DOI:10.19740/j.2096-9872.2024.03.10.
基金信息:
国家自然科学基金(52208140); 北京市教育委员会科学研究计划项目(KM202210016010)