Seismic Response Analysis Of Cryogenic Rubber Bearing Bridge

The earthquake has been a serious threat to human and natural disasters.And the bridge occupies a very important position in the traffic system, called as the lifeline engineering.Once destroyed in the earthquake, the disaster relief and reconstruction work causes incalculable loss.So it is very important to study the seismic performance of the bridge reduction.Laminated rubber bearing and lead rubber bearings are of two kinds of isolation bearing.At present, at home and abroad for the two kinds of isolation bearing research mainly focuses on the value of the common parameters. Temperature changes in the bearing performance under the condition of research is less.The temperature change is less influence on the reduction of is olation bearing.So far we has not yet formed a quantitative conclusion.This paper firstly introduces the bridge damage, the basis of calculation, the commonly used seismic isolation device, and introduces the basic theory and method of calculation of the bridge seismic response. On this basis, the laminated rubber bearing and lead rubber bearing as the research object, in Changchun area of an elevated bridge as an example, the finite element model is established using the the finite element software Midas.Using the laminated rubber bearing and lead rubber bearing, the dynamic temperature under different time history analysis, the two kinds of bearings bearings under different temperature isolation ability.At the same time, changes in the dynamic response and focused on the research of laminated rubber bearing and lead rubber bearings under low temperature, we conclude a summary of the law.The main research contents are as follows:1 Based on the kinetic theory, refer to the relevant design drawings and finite element software, we establish a finite element model of the bridge according to the corresponding methods and procedures.2 Bridges to the study were used laminated rubber bearings and LRB, and calculate the seismic response of the bridge at a different temperature conditions, three seismic wave under the nonlinear time history analysis.3 Through a large number of calculations were obtained at two bearing vibration response to various temperatures, and then draw a curve related to the temperature, comparing two different bearing curve.We can get laminated rubber bearings and Lead rubber bearings at low temperature conditions, seismic isolation performance changes with temperature changes in the law, in order to get some beneficial uses low-temperature region of cold laminated rubber bearings or LRB bridges conclusions, as well as some helpful design data and conclusions of work.