基于车辆响应的连续梁桥频率识别

亓兴军; 杨晓天; 王珊珊; 丁晓岩; 肖志全

doi:10.13204/j.gyjzG20061301

基于车辆响应的连续梁桥频率识别

doi: 10.13204/j.gyjzG20061301

1. 山东建筑大学交通工程学院, 济南 250101;
2. 山东高速集团有限公司, 济南 250098

基金项目:

山东省交通运输厅科技计划项目（2020B69）；山东高等学校土木结构防灾减灾协同创新中心项目（XTM201904）。

详细信息

作者简介:
亓兴军,男,1974年出生,博士,教授。电子信箱:qxi123@163.com

计量
- 文章访问数: 79
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- 被引次数: 0
出版历程
- 收稿日期: 2020-06-13
- 网络出版日期: 2022-01-11

FREQUENCY IDENTIFICATION OF CONTINUOUS GIRDER BRIDGES BASED ON VEHICLE-BRIDGE COUPLING VIBRATION

1. School of Transportation Engineering, Shandong Jianzhu University, Jinan 250101, China;
2. Shandong Hi-Speed Group Co., Ltd., Jinan 250098, China

摘要

摘要: 通过车辆振动响应识别桥梁动力特性具有方便高效和不影响交通等突出优点，采用约束方程模拟车辆与桥面接触，编制车桥耦合振动有限元计算程序，基于车辆振动方程中包含的桥梁频率信息，采用傅立叶变换对连续梁桥频率进行识别，并对车速、车辆质量和路面不平整度进行分析。结果表明：在路面平整状况下，利用车辆振动加速度识别的桥梁前三阶频率与理论计算结果吻合较好；在路面粗糙状况下，使用前、后两车在桥梁同一位置的加速度相减，通过对加速度差值进行快速傅里叶变换，可以大大降低桥面粗糙度的不利影响；车速对频率识别结果影响的规律性不明显，较低车速更为合适；车辆质量对识别结果基本没有影响；不同等级的桥面粗糙度对于桥梁频率的识别结果基本没有影响。
- 车桥耦合振动 /
- 连续梁桥 /
- 桥梁频率 /
- 傅立叶变换 /
- 车辆振动加速度
Abstract: Recognition of bridge dynamic characteristics by vehicle vibration responses has the outstanding advantages of convenience, high efficiency and no impact on traffic. Constraint equations were used to simulate vehicle-bridge contact, the finite element calculation program of coupling vibration of vehicles and bridges was programmed. Based on the fundamental frequency information of bridges contained in vehicle vibration equations, the frequency of continuous girder bridge was identified by Fourier transform, and vehicle speeds, vehicle mass and road surface roughness were analyzed. The results showed that the fundamental frequency identified by vehicle vibration acceleration was in good agreement with the theoretical calculation results in the condition of pavement smoothness; in the case of pavement irregularity, the acceleration difference between two vehicles at the same position of the bridge were transformed by fast Fourier transform, it could greatly reduce the adverse effects of bridge surface roughness;the regularity of influence of speeds on frequency-recognition results was not obvious, and the lower speed was more appropriate; vehicle mass had little effect on the identification results; the grade of bridge deck irregularity had little effect on the identification of bridge frequencies.
- vehicle-bridge coupling vibration /
- continuous girder bridge /
- bridge frequency /
- FFT /
- vehicle vibration acceleration

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参考文献(19)

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