Experimental Research And Simulation Analysis Of The Mechanical Properties For Bridge Roller Plate Expansion Joint

In recent years,the continuous and rapid development of China’s economy has continuously expanded the demands for infrastructures such as roads and bridges,and the number of bridges has shown a sharp increase.With the increase of vehicle loads and the transportation times,in order to provide a smooth and safe transportation environment,the working performance of the bridges need to meet higher requirements for use.Among them,expansion joints,widely used as a modern bridge technical device,is an important component that affects the stability of the bridge structure.The expansion joints is usually a structure installed in a bridge to prevent deformation due to temperature changes,creep,shrinkage,etc.It can give the deformation of bridge structure in a certain space range,allowing even relatively large displacements between the bridge plates.There will still be no major impact on the performance of the bridge.The correct design and construction of the expansion joints can effectively reduce the temperature stress and impact load of the bridge,ensure the safety of the vehicle transportation as well as the smooth and comfortable driving.Different from the several expansion joints widely used in bridge construction at present,this paper mainly studies a kind of bridge roller plate expansion joint,which is a new type of expansion joints.It uses multiple roller plates to slide on a curved bracket to realize implement scaling.The specific research content of this thesis is as follows: First,through the test and research of the bridge roller plate expansion joint,it includes the tension test of the roller joint between the telescopic devices,frictional resistance test and overall fatigue test.Focusing on the principle of the test,the content of the test,and the test results,we analyzes the mechanical properties of the friction joints,stress strain,and tensile properties under specific conditions of the expansion joint.Secondly,the ABAQUS is used to make modeling and finite element analysis of the bridge roller plate expansion joint.We establish a finite element model,and simulate a corresponding mechanical properties of the test device by the finite element model to study the mechanical properties such as friction,stress and strain at specific positions of the expansion joint under different working conditions.Finally,based on experimental research and numerical simulation,we compare the test results with the simulation results to further demonstrate the correctness of the model,and then explore the improvement measures of the bridge roller plate expansion joint.