变速移动荷载作用下简支梁桥的动力响应及共振分析

王少钦;夏 禾;郭薇薇;安 宁;杜宪亭

振动与冲击 ›› 2010, Vol. 29 ›› Issue (2) : 26-30.

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PDF(1192 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (2) : 26-30.
论文

变速移动荷载作用下简支梁桥的动力响应及共振分析

  • 王少钦;夏 禾;郭薇薇;安 宁;杜宪亭
作者信息 +

Dynamic Response and Resonance Analyses of Simply-supported Bridgeunder Speed-varying Loads

  • Wang Shaoqin;Xia He;Guo Weiwei;An Ning;Du Xianting
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摘要

基于振型叠加原理,采用广义坐标变换的方式建立了移动荷载匀变速通过简支梁桥时系统的动力平衡微分方程并编写了分析程序。以某3×32 m铁路多跨简支箱梁桥为例,计算得到车辆匀速运行时桥梁最大挠度随车速的变化曲线,选取曲线上的代表值点进一步计算,并从车桥共振的角度详细分析了桥梁最大挠度的变化趋势以及车辆变速运行对桥梁最大挠度的影响。

Abstract

Based on the modal superposition technique, the dynamic equations of the coupled vehicle-bridge system are established with generalized coordinates when the vehicle loads traverse the bridge with varying speed, and a computer code is worked out. The proposed framework is then applied to the analysis of a railway bridge with 3×32 m multi-span simply-supported box-girders. The distribution curve of the bridge maximum deflection versus vehicle speed was drawn based on the calculated data. To study the influence of the speed variation on the bridge deflection, a further calculation was performed on selected typical values on the curve. The influences of speed varying of loads on the peak bridge deflections and their varying tendency were explained in detail by the vehicle-bridge system resonance mechanism.

关键词

移动荷载 / 变速运动 / 简支梁 / 动力响应 / 共振分析

Key words

moving-load / motion with varying speed / simply-supported bridge / dynamic response / resonance analysis

引用本文

导出引用
王少钦;夏 禾;郭薇薇;安 宁;杜宪亭. 变速移动荷载作用下简支梁桥的动力响应及共振分析[J]. 振动与冲击, 2010, 29(2): 26-30
Wang Shaoqin;Xia He;Guo Weiwei;An Ning;Du Xianting. Dynamic Response and Resonance Analyses of Simply-supported Bridgeunder Speed-varying Loads[J]. Journal of Vibration and Shock, 2010, 29(2): 26-30

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