Dynamic longgauge strain solution method for highway bridge under vehiclebridge coupling
1. Jiangxi GanGuangdong Expressway Postdoctoral Workstation, Nanchang, Jiangxi 330013, China; 2. School of Civil Architecture, East China Jiaotong University, Nanchang, Jiangxi 330013, China
Abstract：To solve the problem that the vehicle bridge coupling method could not directly solve the longgauge strain of bridge, the solution method for the dynamic longgauge strain time history of bridges was investigated under the moving vehicle loads. Considering the influence of road surface irregularity, the dynamic solution equation of the longgauge strain of bridge in the vehicle bridge coupling system is solved by MATLAB software. The dynamic longgauge strains in the middle of bridge span at different speeds were solved and compared with the traditional point strain time history. The results show that the longgauge strain and the point strain time history are generally close. When the vehicle speed exceeds 20 m·s-1, the difference between them is slight. Under different vehicle speed conditions, the long gauge dynamic strain time history and the point strain time history have the same change regularity with vehicle speed. The variation regularity of longgauge strain with vehicle speed and the accuracy of theoretical test are verified.
