基于车桥振动接触加速度的桥梁频率识别  

Bridge Modal ldentification Based on Vibration Acceleration of Vehicle-bridge Contact Point

作　　者：孙绪法 Sun Xufa(School of Traffic Engineering,Shandong Jianzhu University,Jinan 250101,China)

机构地区：[1]山东建筑大学交通工程学院,济南250101

出　　处：《特种结构》2022年第1期86-89,95,共5页Special Structures

摘　　要：本文以连续梁桥为研究对象,研究车辆和桥梁的接触点响应问题。依据实际桥梁参数,建立车桥有限元模型,获取车辆响应,通过中心差分法,计算出接触点加速度,进而识别出桥梁频率。数值模拟结果表明,在平整条件下,通过车辆的接触点响应识别桥梁频率优于车辆响应识别;在粗糙条件下,桥梁频率难以很好识别,为了更清晰、更直观得出较好的桥梁频率结果,加入车流的影响,得出车流对桥梁频率识别更有利。In this paper,an actual continuous girder bridge was taking as the research object to study the response of vehicle-bridge contact point.According to the bridge parameters,a finite element model of the vehicle-bridge was established and the vehicle response was obtained.Through the central difference method,the acceleration of the contact point was calculated,and then the bridge frequency was identified.Numerical simulation results showed that under smooth road conditions,the contact point response can better identify the bridge frequency than the vehicle response;under rough road conditions,the bridge frequency is difficult to identify well.In order to obtain the bridge frequency,the influence of traffic flow was considered.It was shown that considering the traffic flow is beneficial to the identification of bridge frequency.

关 键 词：中心差分法 接触点加速度 数值模拟 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]