Influence of Crossbeam Effect on Vehicle-Bridge Coupled Vibration

doi:10.3969/j.issn.1674-0696.2017.04.02

Abstract

Abstract: The simplified calculation model of additional roughness caused by crossbeam effect was proposed; the solution method for the vehicle-bridge coupled vibration considering the crossbeam effect was given. The problem that the modal synthesis method using truncated mode can’t reflect the vibration of bridge structures such as crossbeam and deck was solved. And different results considering the crossbeam effect or not were comprised and analyzed by case study. The non-dimensional parameter γ describing the change aptitude of deck system’s elastically supporting stiffness was introduced at the same time, and its influence on the vehicle-bridge coupled vibration was also studied. The results show that crossbeam effect is coupled with the vehicle-bridge vibration system, and its effect value increases with the increase of parameter γ according to high order.

Key words: bridge engineering, vehicle-bridge coupled vibration, crossbeam effect, additional roughness, modal synthesis method, elastically supporting stiffness

摘要： 提出了由横梁效应引起的附加不平整度的简化计算模型，给出了考虑横梁效应的车-桥耦合振动问题求解方法，解决了模态综合法因采用截断模态无法反映桥梁结构如横梁、桥面板等局部构件振动情况的问题，并通过算例对横梁效应考虑与否进行了对比分析，同时引入描述横梁效应桥面系刚度变化幅度的无量纲参数γ，研究了其对考虑车-桥耦合振动的影响。研究结果表明：横梁效应与车-桥振动系统存在耦合关系，其效应值随参数γ增加而增加，呈高次变化规律。

关键词: 桥梁工程, 车-桥耦合振动, 横梁效应, 附加不平整度, 模态综合法, 弹性支承刚度

CLC Number:

WANG Fan1, WU Honglin2. Influence of Crossbeam Effect on Vehicle-Bridge Coupled Vibration[J]. Journal of Chongqing Jiaotong University(Natural Science), 2017, 36(4): 7-11.

王帆1，吴红林2. 横梁效应对车-桥耦合振动的影响研究[J]. 重庆交通大学学报（自然科学版）, 2017, 36(4): 7-11.

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