Statistical analysis on vehicle bridge separation of highway bridges caused by near fault ground motions

被引：0
作者：
Xu Y. [1 ]
Lin G. [1 ]
Cui C. [2 ]
机构：
[1] Tongji University, Shanghai
[2] Shanghai Municipal Engineering Design Institute ( Group ) Co.Ltd., Shanghai
来源：
Tumu Gongcheng Xuebao/China Civil Engineering Journal | 2024年 / 57卷 / 02期
关键词：
dynamic contact; highway bridge; near fault ground motions; seismic response; vehicle-bridge detachment;
D O I：
10.15951/j.tmgexb.22111090
中图分类号：
学科分类号：
摘要：
In recent years, with the increase of China' s per capita car ownership, the domestic traffic density has increased significantly and intensified traffic congestion occurs frequently. In addition, the phenomenon of heavy truck overload has become more and more serious, increasing the impact of vehicle load on small and medium-span bridges. In the meanwhile, the probability of vehicles on the bridge is increased in the event of an earthquake , Therefore, considering the influence of vehicles on the bridge response under earthquake will help to accurately evaluate the seismic performance of the bridge. Taking a typical three-span continuous girder bridge as the engineering background, this paper uses the dynamic model considering the influence of vehicles ( contact or separation with the bridge deck) to statistically analyze the vehicle bridge coupling system under the action of recorded near fault ground motions. And the relationship between the action of vehicles on the bridge and the peak ground acceleration (PGA) , the influencing factors of vehicle separation and the statistical influence law of vehicle separation on vehicle bridge coupling response are studied. The results show that under the action of near fault ground motion, the presence of vehicles may increase or decrease the vertical displacement response of the bridge, and with the increase of PGA, the effect of vehicles on the bridge tends to be unfavorable. The dynamic interaction between vehicle and bridge may lead to vehicle bridge separation , which is not directly related to the PGA of ground motion, but the time step of vehicle bridge separation increases with the vehicle vertical frequency. When vehicle bridge separation occurs, the maximum contact force between the vehicle and the bridge may reach 7. 9 times that of vehicle weight, which has extremely adverse impact on the bridge. However, it is also found that the vertical displacement responses of the bridge depend less on the separation between the vehicle and the bridge. © 2024 Chinese Society of Civil Engineering. All rights reserved.
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页码：46 / 55
页数：9
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