双链式悬索桥在单车荷载下的振动特征

丁南宏;林丽霞;吴亚平;钱永久

振动与冲击 ›› 2010, Vol. 29 ›› Issue (7) : 216-220.

PDF(1433 KB)
PDF(1433 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (7) : 216-220.
论文

双链式悬索桥在单车荷载下的振动特征

  • 丁南宏1,2;林丽霞1;吴亚平1;钱永久2
作者信息 +

Vibration Character of Double Cable Suspension Bridge under Single Vehicle Load

  • Ding Nan-hong1;Lin Li-xia1; Wu Ya-ping1;Qian Yongjiu2

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摘要

鉴于车体点头刚度对双链式悬索桥动态响应的影响很小,采用单个移动质量-弹簧-阻尼车辆模型,应用达朗贝尔原理和位移协调条件,推导出车桥耦合振动的运动方程。考虑几何非线性及桥面平整度因素,就车辆沿桥纵轴向中心行驶和偏心行驶两种工况,探讨单个移动车辆荷载对双链悬索桥振动响应的影响。针对不同车速、不同桥面平整度,分析了单个车辆对双链式悬索桥的冲击效应。引入主缆形状系数,将单链式悬索桥作为双链式悬索桥的特例,就双链式悬索桥和单链式悬索桥车振响应进行对比分析,揭示双链式悬索桥车振特征。双链式悬索桥车振响应特征的研究对该类桥设计选型、动力性能评估及动力加固设计都有积极的意义。

Abstract

Taking into account the fact that the stiffness of vehicle body nod has little effect on the dynamic responses of double cable suspension bridge, a single moving mass-spring-damper model is adopted to simulate the vehicle model. The equation of vehicle-bridge coupling vibration is derived, using D'Alembert principle and the conditions of displacement compatibility. The dynamic responses of a double cable suspension bridge to the vehicle moving at different speeds were analyzed, considering the geometric nonlinearity and the bridge carriageway irregularity factor, under two types of vehicle loading conditions, namely moving along the center and the eccentric longitudinal axis. Then the influence of vehicle velocity and bridge carriageway irregularity on impact coefficient of double cable suspension bridge is discussed. Single cable suspension bridge can be taken as a special case of double cable suspension bridge, after the main cable shape coefficient is introduced. The dynamic responses of double cable suspension bridge and single cable suspension bridge are compared to reveal the character of vehicle vibration of double cable suspension bridge. The study of the dynamic responses character of double cable suspension bridge has a positive significance on structural form selection of such type bridge during designing, dynamic performance evaluation and reinforcement design has positive significance.

关键词

双链式悬索桥 / 桥面平整度 / 车桥耦合振动 / 冲击系数 / 主缆形状系数

Key words

double cable suspension bridge / bridge carriageway pavement irregularity / vehicle-bridge coupling vibration / impact coefficient / cable shape coefficient

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导出引用
丁南宏;林丽霞;吴亚平;钱永久. 双链式悬索桥在单车荷载下的振动特征[J]. 振动与冲击, 2010, 29(7): 216-220
Ding Nan-hong;Lin Li-xia;Wu Ya-ping;Qian Yongjiu . Vibration Character of Double Cable Suspension Bridge under Single Vehicle Load[J]. Journal of Vibration and Shock, 2010, 29(7): 216-220

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