The Analysis Of Lead Rubber Bearing In Cold Regions Of The Bridge Seismie

The earthquake is one of natural disasters to human society, the research and application of reducing vibration isolation system is the main way of mitigating earthquake caused losses of life and property. Lead-rubber bearings, which have advantages such as damping effect, safety performance, durability and applicability of economic, are adopted more and more in bridge seismic field. The reducing vibration isolation research of lead-rubber bearings mainly concentrated on the research of various parameters value and hysteresis curve form factors, has no systematic conclusion of bearing performance change under the case of temperature change at home and abroad, while practice have confirmed that the change of temperature environments has important implications on bearing shock absorption effect, in particular, a greater impact under low temperature conditions.The paper taking lead-rubber bearings2000for object, focused on the work of the following aspects:(1)This paper comprehensively summarized and compared the theory and method of nonlinear dynamic analysis, provided the theoretical basis for the finite element simulation analysis of suspension bridge damping of rubber lead core support.(2)According to the seismic waves selection principle in nonlinear time-history analysis and the selection and adjustment of seismic wave, the article utilized the SIMQKE_GR program which generated artificial seismic waves in accordance with seismic response spectrum and obtained the synthetic seismic waves which suit for the finite element simulation analysis of lead-rubber bearing bridge.(3)Taking continuous beam bridge with the span of40m+40m+40m, bridge pier attach upper with LRB2000rubber lead core support, bridge bottom and beam ends are rubber banding, the model with finite element analysis software "MIDAS/CIVIL", the article conducted the nonlinear time-history analysis with bridges with LRB2000bearings and ordinary support apart, input the seismic waves which has in software, we can find the trends which affected by the same seismic wave are basically the same, but the changes of value are great. The conclusion is that lead-rubber bearings weakened seismic response significantly.(4) Lead rubber bearing has relevance to mechanics properties and temperature environment because of the nature of the material itself。Using MIDAS/CIVIL software to adopt the data parameter of the Lead rubber bearing in different temperature, the model input the three seismic waves to analysis Three-Span Continuous Deep Beams by the time-history analysis. The result obtains series of seismic response and find three different changed situation and Influence of Lead rubber bearing with the temperature variation in three different seismic waves。The article draws some finite element conclusions of benefit to cold regions in China in using Lead rubber bearing of bridge.