含呼吸裂缝的桥梁振动响应与时频特性分析

PDF(1765 KB)

振动与冲击 ›› 2013, Vol. 32 ›› Issue (11) : 12-16.

论文

含呼吸裂缝的桥梁振动响应与时频特性分析

王文洁，吕中荣，刘济科

作者信息 +

The dynamic response and time-frequency analysis of the bridge with breathing cracks

WANG Wen-jie LU Zhong-rong LIU Ji-ke

Author information +

文章历史 +

摘要

本文对车桥耦合系统的动力响应进行时频特性分析。以欧拉梁模拟有损伤的桥梁，以两轴汽车模型模拟移动车辆，利用有限元法建立了有损伤桥梁结构在车辆作用下的运动方程。运用Newmark直接积分法计算出了车桥耦合系统的振动响应，分析了不同裂缝模型对桥梁动力响应的影响，并借助Hilbert-Huang变换获得损伤桥梁动力响应的时频谱和边际谱，结果表明由于呼吸裂缝的影响，桥梁动力响应将呈现出明显的谐波效应；进一步对比不同车流状况作用下桥梁动力响应的时频特性，车流会对桥梁呼吸裂缝的开合变化产生影响，随着车辆的数目增多，桥梁振动加剧，谐波能量也增大。

Abstract

This paper deals with the time-frequency analysis of a coupled bridge-vehicle system. The bridge is modeled as an Euler beam with breathing cracks. Two-axle vehicle is used to represent the vehicle. A coupled bridge-vehicle system is established using the finite element method, and Newmark direct integration is adopted to calculate the dynamic responses of the coupled system. The effect of the crack models on the dynamic response of the bridge is investigated. The HHT spectrum and HHT marginal spectrum of the dynamic response are obtained using the Hilbert-Huang transform. The results of time-frequency analysis indicate that complicated harmonic effect will appear due to the breathing effect of the cracks. And the time-frequency characteristics of the responses with different traffic flow are also compared. It can be concluded that traffic flow has an effect on breathing crack. The vibration of the bridge will be more intense and the energy of harmonics will increase when more and more vehicles move across the bridge.

导出引用

王文洁;吕中荣;刘济科. 含呼吸裂缝的桥梁振动响应与时频特性分析[J]. 振动与冲击, 2013, 32(11): 12-16

WANG Wen-jie LU Zhong-rong LIU Ji-ke. The dynamic response and time-frequency analysis of the bridge with breathing cracks[J]. Journal of Vibration and Shock, 2013, 32(11): 12-16