The Temperature On Seismic Performance Of Rubber Bearing Impact Analysis In Cold Regions

Since ancient times,the seismic hazard is one of humanity's worst natural disasters,and the bridge across the rivers,lakes and other obstacles of its structure occupies a very important position in transportation systems,regarded as the lifeline engineering,seismic action once the bridge is damaged,it will have very serious loss relief and subsequent reconstruction work in disaster areas,so we study the performance of the bridge reduced isolation has very important significance.Currently,most scholars at room temperature for bridge seismic,and vast areas of China,such as the Northeast,North China and other northern and northwest,and winter temperatures are above-25?,especially in the Northeast,the winter temperature reaches-40 ?.And how seismic behavior of low temperature or cold areas,bridges,domestic and foreign scholars study not too much.Laminated rubber bearing is one of the most ordinary common isolation bearing bridge engineering,is currently at home and abr oad for the study of this bearing mainly on the value of the common parameters,but for a change in temperature of the bearing performance effects or less for a temperature change on bearing isolation Save even less,since quantitative conclusions are not yet formed.For bridges,piers effect of temperature on the material is also very important.At different temperatures,especially on concrete piers,its constitutive equations changes.This bridge a greater impact on the seismic performance of the cold region.This paper introduces the damage to bridges and calculation basis,as well as usual reducing isolation device,also introduced the basic methods of earthquake response analysis and theoretical calculations on this basis,check the information and concluded that,at different temperatures of the concrete change and configuration changes of bearing performance relationship,we laminated rubber bearings for the study,with a viaduct in Changchun as an engineering example,the use of finite element software Midas established finite element model performs under different temperature conditions dynamic time history analysis,the rubber bearings at different temperatures of minus isolation capacity situation at the same time,it focused on the laminated rubber bearing dynamic response at low temperature changes,and constitutive relations of concrete piers low seismic influence.The main contents are as follows:1.Based on kinetic theory,refer to the relevant design drawings,finite element software,according to the corresponding methods and procedures,the finite element model of the bridge.2.This thesis summed the variation of parameters and rubber bearings,as wel l as variation of constitutive relation of concrete piers at 20?,10?,0?,-10?,-20?,-30? and-40?different temperatures.3.Two kinds of different seismic waves and simulate an artificial wave were selected according to the relevant data in line with the model.The bridge seismic response under three types of seismic waves was calculated by the nonlinear time history analysis methods based on the above data that the result of parameters under different temperature conditions.4.The change law of laminated rubber bearing on seismic performance and concrete constitutive relationship compromising on piers under seismic with different temperatures was obtained at low temperatures.