Research on Vehicle-Bridge Coupling Vibration of Self-Anchored Suspension Bridge with Single-Tower

doi:10.3969/j.issn.1674-0696.2015.03.01

Abstract

Abstract: Based on separated iterative algorithm of ANSYS and MATLAB, the motion equations of the vehicle and the bridge which were regarded as two separated subsystems were derived by virtual work principle and finite element method respectively. The displacement coordination condition and force balance relation at contact point were taken into consideration, in order to study the responses of self-anchored suspension bridge with single-tower under various road roughness, vehicle speed and bridge damping. Results indicate grade of road roughness has great influence on dynamic response of bridge. The impact factor behaves wavelike at different speeds. With increase of damping, the response tends to diminish in little degree. In addition, impact factor in current specification tends to be unsafe for structure design of this type of bridge. It is advised that the impact factor of suspension bridge should be regulated separately, considering the effects of road roughness and speed.

Key words: bridge engineering, self-anchored suspension bridge, vehicle-bridge coupling, separated iterative algorithm, impact factor

摘要： 选用基于ANSYS和MATLAB的分离迭代算法，将车辆和桥梁看作两个分离的子系统，分别采用虚功原理和有限元法推导了两者的振动方程；以车桥接触点位移协调关系和力的平衡关系为联系，研究了独塔自锚式悬索桥在不同的路面不平整度、车速、桥梁阻尼下的动力响应问题。研究表明：路面不平度对桥梁动力响应影响很大，冲击系数随车速呈波形变化，增大桥梁结构阻尼比对降低结构的动力响应影响较小；现有规范冲击系数取值对该类桥梁结构设计偏于不安全，建议规范独立地给出悬索桥冲击系数的规定，并考虑路面等级、车速的影响。

关键词: 桥梁工程, 自锚式悬索桥, 车桥耦合, 分离迭代算法, 冲击系数

CLC Number:

U441+.3

Li Hongquan, Zhao Mingshuai, Chen Yanjiang. Research on Vehicle-Bridge Coupling Vibration of Self-Anchored Suspension Bridge with Single-Tower[J]. Journal of Chongqing Jiaotong University(Natural Science), 2015, 34(3): 1-6.

李洪泉,赵明帅,陈彦江. 独塔自锚式悬索桥车桥耦合振动响应研究[J]. 重庆交通大学学报（自然科学版）, 2015, 34(3): 1-6.

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