A study on dynamic load allowance of a simply supported girder bridge based on load efficiency of a dynamic load test

被引：0
|
作者：
Zhou Y. [1 ,2 ]
Zhao Y. [1 ]
Zhao Y. [1 ]
Cao Q. [3 ]
Li Z. [1 ]
机构：
[1] School of Highway, Chang'an University, Xi'an
[2] Research Center of Highway Large Structure Engineering on Safety, Ministry of Education, Chang'an University, Xi'an
[3] Hohhot Municipal Engineering Administration, Huhehaote
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2021年 / 40卷 / 20期
关键词：
Bridge engineering; Dynamic load allowance; Dynamic load test load efficiency; Quasi-design state; Simply supported beam bridge;
D O I：
10.13465/j.cnki.jvs.2021.20.026
中图分类号：
学科分类号：
摘要：
In order to evaluate the impact coefficient of small and medium span simply supported beam bridges, the relationship between the impact coefficient under light load and the impact coefficient under equivalent design load was established. The vehicle-bridge coupling vibration equation was established by using the five-degree-of-freedom three-axis plane model and the standard span simply supported small box girder bridge as the research object, and the simulation solution was carried out by using the secondary development language APDL of ANSYS software. Firstly, through the load equivalent principle, the lane load of the design load was reduced to the equivalent heavy vehicle load, and the quasi-design state analysis was carried out; secondly, based on the dynamic load test load efficiency, the change law of the impact coefficient of each main beam under the action of a single vehicle was studied, and the influence of different factors on the impact coefficient was compared and analyzed. Finally, a light load impact coefficient correction method based on the dynamic load test was proposed. The results show that the impact coefficient of the current code is unsafe, but it is higher when the bridge deck is in good condition and at low speed, and the impact coefficient decreases with the increase of dynamic load test load efficiency. There is no practical significance to compare the impact coefficient obtained by light load directly with the code value, and the impact coefficient of light load can be reduced to the impact coefficient of quasi-design state after correction. The research conclusions can provide reference for the design of small and medium-span bridges and provide a basis for the evaluation method of bridge dynamic load test. © 2021, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：207 / 216
页数：9
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