Finite Element Analysis On The Ultimate Bearing Capacity Of The Rubber Pot Bearing In High-speed Railway Bridges

The bearing is a critical part of bridge structure which indicated that the reaction of superstructure can be effectively delivered to the substructure.A large number of rubber pot bearings applied in railway bridges in recent years.As we all know,china is a country where earthquake often happen.The bearing damage is very common in previous earthquake,so it is necessary to study the ultimate load capacity of the high-speed railway 32 m Simple Support Box Girder KTPZ series of rubber pot bearings.In this thesis,through combination of ANSYS finite element software numerical simulation and theoretical calculation,it can be calculated and analyzed the vertical and horizontal load bearing capacities of rubber pot bearing respectively,and using numerical simulation to optimize the critical size of rubber pot bearing.The major content of this dissertation can be concluded as follows:(1)Through combination of the domestic and international literature search and research report,which not only introduced the background and significance research of rubber pot bearing's ultimate load capacity,but also introduced interrelated development overseas and domestic researches,the existing problems.(2)According to the characteristics of the high-speed railway 32 m Simple Support Box Girder KTPZ series of rubber pot bearings and the current domestic and international design guidelines,then establish a three-dimensional ANSYS finite element modeling.According to the load transfer mechanism of rubber pot bearing,setting up interface elements and the super-elastic rubber material parameters.(3)First of all,based on the simulation of finite element method,the vertical load bearing capacities of rubber pot bearing is analyzed.Then by theory computation and analysis we can obtain vertical load bearing capacities of rubber pot bearings.The results showed that the consequence of finite element numerical simulation and theoretical calculation results are approximately consistent.The results of numerical simulation basically agree well with the results of experiments which obtained by the academy of railway sciences on pot rubber bearings vertical ultimate bearing capacity.The comparative analysis results indicated that the ANSYS three-dimensional finite element numerical simulations is reasonable.(4)In the presence of large-scale universal finite element software ANSYS to analyze the horizontal load bearing capacities of ontology-rubber pot bearings and the shearing capacity of anchor bolts separately,and the results are compared with those based on material mechanics the third strength theoretical computations.It turned out that the horizontal load bearing capacities of rubber pot bearings is controlled by the shear strength of anchor bolts,the theoretical computations results agree well with ANSYS finite element software numerical simulation.(5)Based on the vertical bearing capacity,the strain curve of different sizes of rubber pot bearings.Optimize the bearing dimension mainly for three important parameters,namely,rubber thickness,bottom flange thickness,steel pot ring thickness.It can be insure that reduce the production cost of rubber pot bearing under the condition of the vertical load remains constant with the help of size optimization.