横向撞击力对铁路桥梁及行车影响的模型实验研究

发布时间：2018-04-09 13:00

本文选题：撞击力　切入点：铁路桥梁　出处：《振动与冲击》2014年09期

【摘要】：高速铁路高架桥梁很多,跨越公路的桥墩被汽车撞击所引起的振动会影响列车运行安全。利用车-轨-桥耦合动力试验平台,通过模型试验研究了横向撞击力对桥梁及桥上车辆运行安全的影响规律。试验过程中采集了撞击处撞击力时程、桥墩底部动应变、墩顶动位移、墩顶加速度时程,梁1/4,1/2,3/4处的横向动位移和加速度时程,以及车辆的三向车体加速度时程,计算得到桥墩自振频率等振动特性。分析了车桥系统有无撞击力作用时的动力响应,以及撞击力对桥梁及桥上运行车辆的影响规律。结果表明,横向撞击使桥梁的动力响应大幅度增加,并对车辆运行安全有很大的影响。最后根据撞击力时程探讨了瞬态撞击力的等效静力计算方法并验证,为工程设计提供参考。
[Abstract]:There are many high-speed railway viaducts. The vibration caused by the impact of cars on the piers across the highway will affect the safety of trains.Based on the vehicle-rail-bridge coupled dynamic test platform, the influence of the transverse impact force on the safety of the bridge and the vehicle on the bridge was studied through model tests.During the test, the time history of impact force at the impact site, the dynamic strain at the bottom of the pier, the dynamic displacement of the pier top, the acceleration history of the pier top, the transverse displacement and acceleration time history of the beam at 1 / 4 / 1 / 2 / 3 / 4, and the acceleration time history of the three-way vehicle body were collected.The vibration characteristics of piers such as natural frequencies are calculated.The dynamic response of the vehicle-bridge system with or without impact force is analyzed, and the influence of the impact force on the running vehicle on the bridge and on the bridge is analyzed.The results show that the dynamic response of the bridge is greatly increased and the safety of the vehicle is greatly affected by the transverse impact.Finally, according to the time history of impact force, the equivalent static calculation method of transient impact force is discussed and verified, which provides a reference for engineering design.
【作者单位】：北京交通大学土木建筑工程学院;
【基金】：国家自然科学基金(51308035) 国家重点基础研究计划“973”项目(2013CB036203) 中央高校基本科研业务费项目(2013RC016)
【分类号】：U448.13;U298.1;U441.3

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