Analysis on Vehicle-bridge Coupled Random Vibration under the Action of Heavy Vehicle Considering Non-uniform Effect

被引：0

作者：

Zhu N. ^{[1
,2
]}

Chen S. ^{[1
]}

机构：

[1] School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang

[2] School of Civil and Architecture Engineering, Nanchang Institute of Technology, Nanchang

来源：

Journal of Engineering Science and Technology Review | 2023年 / 16卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Non-uniform effect; Pseudo-excitation method; Random vibration; Simply supported T-beam; Six-axle heavy vehicle;

D O I：

10.25103/jestr.164.25

中图分类号：

U41 [道路工程]; TU997 [];

学科分类号：

0814 ;

摘要：

In the highway vehicle-bridge coupling random vibration analysis, only the input model of uniform effect under the complete incoherence of vehicle wheels is generally considered but neglecting the influence of non-uniform effect triggered by road irregularity excitation on vibration response. To accurately judge the dynamic response and frequency spectrum characteristics of the bridge when the heavy vehicle was excited by the road surface, a vehicle-bridge coupling random vibration model of a six-axle heavy vehicle under multi-point coherent excitation was established on the basis of the structural dynamical principle and the pseudo-excitation method, and a 30-m simply supported T-beam bridge model was constructed through finite element analysis. Then, the random dynamic response and frequency spectrum characteristics of the bridge considering the non-uniform effect of the road surface spectrum under the influence of speed were analyzed and compared with those only considering the uniform effect. Results show that the response value of bridge mid-span under the action of a six-axle heavy vehicle is obviously lower than that under the uniform effect, especially at a speed of 50km/h, the maximum root mean square (RMS) values of the displacement and acceleration of the former are only 0.299 times and 0.348 times those of the latter. When the maximum response occurs, the position of the front wheel of the vehicle is different from that under the same speed and only considering the uniform effect. When the vehicle is driving at low speed and high speed, the number of main frequencies of the bridge considering the nonuniform effect increases, and the amplitude of power spectral density (PSD) is highly reduced compared with that considering the uniform effect. At the speed of 120km/h, the number of main frequencies increases from 2 under the uniform effect to 4. Conclusions obtained in the study have a significantly academic value for the application of heavy vehicle in the research on bridge reliability. © 2023 School of Science, IHU. All rights reserved.

引用

页码：205 / 213

页数：8

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