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Dynamic effect of heavy-haul train on seismic response of railway cable-stayed bridge
Journal of Central South University ( IF 4.4 ) Pub Date : 2020-08-09 , DOI: 10.1007/s11771-020-4421-z
Zhi-hui Zhu , Wei Gong , Kun Wang , Yu Liu , Michael T. Davidson , Li-zhong Jiang

This paper focuses on understanding and evaluating the dynamic effect of the heavy-haul train system on the seismic performance of a long-span railway bridge. A systematic study on the effect of heavy-haul trains on bridge seismic response has been conducted, considering the influence of vehicle modeling strategies and dynamic characteristics of the seismic waves. For this purpose, the performance of a long-span cable-stayed railway bridge is assessed with stationary trains atop it, where the heavy-haul vehicles are modeled in two different ways: the multi-rigid body model with suspension system and additional mass model. Comparison of the bridge response in the presence or absence of the train system has been conducted, and the vehicle loading situation, which includes full-load and no-load, is also discussed. The result shows that during the earthquake, the peak moment of the main girder and peak stress of stay cables increase by 80% and by 40% in the presence of fully loaded heavy-haul trains, respectively. At the same time, a considerable decrease appears in the peak acceleration of the main girder. This proves the existence of the damping effect of the heavy-haul train system, and this effect is more obvious for the fully loaded vehicles. Finally, this paper proposes an efficient vehicle modeling method with 2 degrees of freedom (DOF) for simplifying the treatment of the train system in bridge seismic checking.



中文翻译:

重载列车对铁路斜拉桥地震响应的动力影响

本文着重于理解和评估重型火车系统对大跨度铁路桥梁抗震性能的动态影响。考虑到车辆建模策略和地震波动态特性的影响,对重型列车对桥梁地震响应的影响进行了系统的研究。为此,在大跨度斜拉铁路桥的顶部安装固定火车来评估其性能,其中重型车辆的建模有两种不同的方式:带悬架系统的多刚体模型和附加质量模型。在有或没有列车系统的情况下,已经进行了桥梁响应的比较,并且还讨论了包括满载和空载在内的车辆装载情况。结果表明,在地震作用下,满载重载列车时,主梁的峰值力矩和斜拉索的峰值应力分别增加了80%和40%。同时,主梁的峰值加速度明显降低。这证明了重载列车系统的阻尼作用的存在,并且这种作用对于满载车辆而言更加明显。最后,本文提出了一种有效的具有2自由度(DOF)的车辆建模方法,以简化桥梁地震检查中列车系统的处理。主梁的峰值加速度明显降低。这证明了重载列车系统的阻尼作用的存在,并且这种作用对于满载车辆而言更加明显。最后,本文提出了一种有效的具有2自由度(DOF)的车辆建模方法,以简化桥梁地震检查中列车系统的处理。主梁的峰值加速度明显降低。这证明了重载列车系统的阻尼作用的存在,并且这种作用在满载车辆中更为明显。最后,本文提出了一种有效的具有2自由度(DOF)的车辆建模方法,以简化桥梁地震检查中列车系统的处理。

更新日期:2020-08-10
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