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Random vibration of bridge excited by bridge deck irregularity ofheavy vehicle with coherent wheels(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2021年4期
Page:
43-55
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Random vibration of bridge excited by bridge deck irregularity ofheavy vehicle with coherent wheels
Author(s):
CHEN Shuisheng;  ZHAO Hui;  LI Jinhua;  ZHU Zhaoyang
(School of Civil Engineering and Architecture, East China Jiaotong University,Nanchang 330013, Jiangxi, China)
Keywords:
bridge engineering;  random vibration of bridge;  pseudo excitation method;  all wheels of heavy vehicle are coherent;  irregularity of bridge deck;  vehiclebridge coupling
PACS:
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DOI:
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Abstract:
In order to study the influence of coherent bridge deck excitation of each wheel of the heavy vehicle on the vibration response of the bridge. The input power spectrum matrix of bridge deck excitation for each wheel of the heavy vehicle was derived, according to the coherence function relationship of left and right wheels and the time lag relationship of front and rear wheels, and the frequency domain model of multi wheel and multipoint deck irregularity excitation was established. A fouraxle heavy truck was taken as the research object, the influence of coherent bridge deck excitation of each wheel of the heavy vehicle on the vibration response of a continuous Tbeam bridge was analyzed by using the pseudo excitation method. The results show that the coherence of each wheel of the heavy vehicle increases the excitation intensity of the bridge deck irregularity and increases the vibration response of the bridge, the vibration response of the bridge increases with the increase of the coherence strength. The vibration responses of the bridge is different under different coherence function models, but they can reflect the vibration response law of bridge under the coherent bridge deck excitation of each wheel of the heavy vehicle. The vibration response of the bridge under the synchronous bridge deck excitation of each wheel of the heavy vehicle is the largest, followed by the vibration response of the bridge under the coherent bridge deck excitation of each wheel of the heavy vehicle, and the vibration response of the bridge considering only the lag of bridge deck excitation time of each wheel is the least. The vibration response of the bridge excited by nonstationary bridge deck irregularity is greater than that of the stationary excitation. The greater the acceleration and initial speed of the heavy vehicle, the greater the vibration response of the bridge. Under different load cases, the vibration response of Tbeam directly under heavy vehicle load is greater than that under indirect load. The vibration response of the bridge increases with the deterioration of the road condition, and the root mean square value of the vibration response increases exponentially. Multi axle load vehicle is sensitive to the excitation of bridge deck irregularity. With the same vehicle load, the bridge vibration response increases with the increase of the number of heavy axles, and the bridge vibration response caused by the whole vehicle is greater than that of the trailer. The research results can not only provide reference for bridge construction and maintenance, but also provide theoretical basis for speed limit and weight limit of heavy vehicle crossing bridge, and fully explain the necessity of strengthening bridge deck maintenance. 1 tab, 15 figs, 36 refs.

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Last Update: 2021-08-12