考虑车辆运行参数变化的悬索桥车激振动分析

发布时间：2018-01-13 05:21

本文关键词：考虑车辆运行参数变化的悬索桥车激振动分析　出处：《铁道科学与工程学报》2017年07期 　论文类型：期刊论文

【摘要】：悬索桥跨度大,柔性高,在车辆通过时,易发生振动。为了研究其车激振动问题,利用动力平衡原理和有限元法,建立车桥系统振动微分方程。以湘西矮寨大桥为背景,通过对桥面不平顺进行数学模拟,利用计算机软件ANSYS分析大跨度悬索桥在车流分别以不同速度和车重运行时主梁跨中位移、主缆、吊杆和腹杆的动力响应。研究结果表明:随着行车速度或车重的增加,结构响应通常增大,但主梁跨中横向振动位移随车速的变化具有不确定性;车辆运行参数对主梁竖向振动位移的影响显著;而对主梁横向振动位移的影响较小;结构动力响应对车速的变化比对车重的变化更为敏感。
[Abstract]:In order to study the problem of vehicle-induced vibration, the suspension bridge has large span and high flexibility. In order to study the problem of vehicle-induced vibration, the dynamic balance principle and finite element method are used. The vibration differential equation of vehicle-bridge system is established. Based on the background of Xixi Paizhai Bridge, the bridge deck irregularity is simulated by mathematics. The mid-span displacement and main cable of the main girder of the long-span suspension bridge are analyzed by using the computer software ANSYS when the vehicle flow is running at different speeds and vehicle weights respectively. The results show that the structural response usually increases with the increase of driving speed or vehicle weight, but the variation of lateral vibration displacement of the main beam in the middle of the span is uncertain with the speed of the vehicle. The effect of vehicle operating parameters on the vertical vibration displacement of the main beam is significant. But the influence on the transverse vibration displacement of the main beam is small. The dynamic response of the structure is more sensitive to the change of the vehicle speed than the change of the vehicle weight.
【作者单位】：郑州大学土木工程学院;黄河建工集团有限公司;
【基金】：国家自然科学基金青年资金资助项目(51408557)
【分类号】：U441.3
【正文快照】： 悬索桥由于桥面存在不平顺,在重复的移动车辆荷载作用下,将会与车辆形成动力相互作用,其结果是桥梁某些构件可能产生较大的动位移和应力。为了确保结构安全,在进行桥梁结构设计时,应认真考虑桥梁结构在移动车辆荷载作用下的动力响应。车桥耦合振动的研究已取得很多成果[1-4]。

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