Study On Transverse Distribution Of Bridge-vehicle Interaction Of Simply Supported Plate Girder Bridge

As the national economy continously increases,the requirement for transportation escalates. So, many highway and city freeways have been built recently. And because of high speed of vehicle and heavy traffic on the highway bridges, and also because the simply supported plate girder bridge is the most frequently bridge type of structure used in the bridge design.So the dynamic response of the plate girder bridge under moving loads are the problem which is concerned about all along, and also a project to be studied deeply.In this paper, the theories of bridge dynamics and numerical calculation are introduced firstly, and then Eular beam is decided on as the simulation of biridge.and movable invariable load and movable vibration mode are decided on as the simulation of vehicle loads to analyse the dynamic response and transverse distribution of the plate girder bridge.At last, present the concept of transverse distribution of the plate girder bridge. And the wide bridges and narrow bridges are analysed with FEA method and analysis method.The main contents are as the following:1. Viewing the single plate girder as the studying target, Eular beam is decided on as the simulation of biridge. Firstly, dynamic responses of plate girder are analysed with movable invariable load and then creat FEA model of plate girder,compare the numerical and the analysis results.Then analyse the dynamic responses of plate girder with different speed of vehicle and different span of bridge,and the influence of different speed of vehicle and different span of bridge on impacting factor of plate girder bridge is analyzed.And dynamic responses of plate girder are analysed with movable vibration mode and then creat bridge-vehicle interaction differential eguation of plate girder.The Newmark method is used to solve the differential eguation.Also analyse the dynamic responses and impacting factor of plate girder with different speed of vehicle and different span of bridge. And the results obtained with the two methods are compared and analyzed. The impacting factor obtained with the two methods are compared with the new code and the old code.2. Viewing the single plate girder bridge as the studying target, vehicle loads is simplified as mobile invariable load. Firstly, present the concept of transversedistribution of the plate girder bridge on moving load, deduce the analysis results of dynamic response of each beam of plate girder bridge,and creat FEA model of plate girder bridge and analyzed with FEA method. The results obtained with the two methods are compared and analyzed.And analyze the wide bridges and narrow bridges,get the applicability of the analysis results. The method and results of this paper will provide certain theoretical method and reference for continuous research on dynamic analyse of the simply supported plate girder bridge. And also provide certain theoretical method and reference for continuous research on dynamic design and moving loads identification of the simply supported plate girder bridge.