Researches On The Seismic Performance Of Bridge Bearing And Stopper

Bridge bearing is an important component of the upper and lower parts of the bridge,which plays an important role in the transmission of the force.In the normal use stage,the load of the upper structure(vehicle load,crowd load,wind load,etc.)will be transferred to the lower part of the foundation structure.In the event of an earthquake,bridge bearing can reduce the transmission of inertia force to the lower part of the structure to a certain extent,and avoid the serious structural damage of the bridge.When the relative displacement of the structure greatly exceeds the allowable displacement,stopper will form a second line of defense to protect the bridge to prevent the occurrence of falling beam.The mutual coordination between them ensures the safety requirements of the use of the bridge.Bridge bearing and stopper are widely used in modern bridge.In recent years,earthquakes occurred frequently at home and abroad,due to the earthquake,the bridge bearing damage,and even the phenomenon of falling beam is very common,causing serious economic losses and casualties..It is very important about how to fully play the role of the bridge bearing and stopper,so as to reduce the earthquake damage to the overall structure of the bridge.On the basis of consulting the domestic and foreign related research,this paper mainly studies the seismic performance of four kinds of bearings(laminated rubber bearing,high damping rubber bearing,sliding plate bearing and basin rubber bearing),combined with experimental research and numerical simulation technique to analyze the mechanical properties.At the same time,the paper takes the Baihua bridge as the research carrier,and compares the seismic response of the bridge with the non-seismic block and the different support combination.The main work of this paper are as follows:(1)This paper briefly introduces the structural characteristics of various bridge bearings and stopper,and summarizes the seismic damage phenomena of various bridge bearing and the present situation of research on seismic performance.(2)Combined with the existing test conditions,the proposed method is developed for the quasi-static test of bridge bearings,studying on the horizontal constitutive relation of bearing under different vertical load and frequency,analyzing and comparing the energy dissipation characteristics of bearings and the difference between single and bidirectional energy dissipation.(3)The finite element model of ANSYS was established according to the actual size of the bearing,and laboratory tests are carried out to compare and expand the scope of numerical simulation,getting the single and bidirectional curve of the bearings,then comparing and analyzing the seismic performance of the energy dissipation.(4)Based on the test data of bridge support and Midas Civil software,the finite element model of the whole bridge was established to analyze the seismic response of the bridge,analyzing of the effect of transverse stoppers in earthquake and the influence of different support combinations on the seismic resistance of bridge.