大跨度多线铁路斜拉桥行车安全性分析  

Analysis of the Train Running Safety of Multi-line Railway Cable-stayed Bridge

作　　者：罗静峰[1] LUO Jing - feng(China Railway Group Limited,Beijing 100039, China)

机构地区：[1]中国中铁股份有限公司,北京100039

出　　处：《铁道工程学报》2018年第5期58-62,共5页Journal of Railway Engineering Society

摘　　要：研究目的:列车通过桥梁时,与桥梁的耦合作用会影响桥上列车的行车安全性。大跨度斜拉桥由于自身结构柔度较大,其与列车的耦合作用往往会导致较大的桥梁响应,列车的行驶安全性更加需要予以重视。本文以某大跨度四线铁路斜拉桥为例,采用计算机模拟方法进行车-桥耦合分析,讨论不同列车类型、车速、列车行驶位置及双车交会下的桥梁及列车响应。研究结论:(1)不同速度等级下,桥梁振动响应呈往复变化,当列车施加的激励频率接近桥梁低阶自振频率时,桥梁振动接近峰值;车辆响应随车速增加而增大;(2)车辆类型对桥梁响应影响较大,其中货车C80的各项车辆响应指标更大;(3)车辆运行轨道对桥梁加速度和竖向位移的影响较小,对车辆响应的影响也较小,但对桥梁的横向位移影响较大;(4)双车运行情况下,随着两车入桥差的增加,桥梁的响应有所改善,不同的入桥距离对车辆响应的影响不明显;(5)本研究成果对类似大跨度斜拉桥的设计具有一定的参考价值。Research purposes： The vehicle - bridge coupling vibration has a great influence on the running safety of the trains on the bridge. As the structure of the long - span railway bridge is more flexible, it usually undergoes a larger response under the vehicle - bridge coupling action, and more attention should be paid to the running safety of the train. In this thesis, a long - span four - line railway cable - stayed bridge is taken as an example and the computer simulation method is utilized to analyze the vehicle - bridge system. It discusses the vehicle - bridge response in terms of the vehicle type and speed, the vehicle travelling track, and two passing trains at the bridge. Research conclusions： （ 1 ） The bridge vibration response reciprocates at different speeds, and the bridge vibration is close to the peak when the frequency of the moving load approaches the low - order longitudinal natural vibration frequency of the bridge. The train responses increase with the increase of train speeds. （2） The train type has a great impact on the bridge response, and the train response indicators of the freight train C80 are larger. （3） The running track of the train has less impact on the acceleration and vertical displacement of the bridge, as well as to the train response, but has a great impact on the horizontal displacement of the bridge. （4） Under the condition of two - train operation, the bridge response improves with the increase of the gap between the two trains, while the different inbound distance to the train response is not obvious. （5） The results of this study have certain reference value for the design of similar long- span cable -stayed bridges.

关 键 词：大跨度斜拉桥 高速铁路 动力响应 车-桥系统 耦合振动 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]