Research Of Seismic Isolation Of SMA Compound Bearing In Different Ni-Ti Content

At present, in the field of seismic isolation for building structures, two seismicisolation components are most widely used, laminated rubber bearing and lead rubberbearing. However they expose various problems in using. The former, laminatedrubber itself is easy to inadequate dissipation and reduces the bearing stability; andthe latter, lead rubber bearing has the defect of self recovery capability due toexcessive deformation, so the bearing can’t restitute to the original position.A new bearing material--shape memory alloy (SMA) can effectively solve theseproblems. SMA having pseudo-elasticity transformation, SMA is arranged aroundlaminated rubber bearing to provide additional power, helps the bearing restitute tothe original position and maintain stability. Different components in SMA cause agreat difference in mechanical properties. According to this characteristic, thedissertation studies the pseudo-elasticity transformation and energy consumptioncharacteristics of different Ni-Ti SMA, expecting to find excellent performance ofNi-Ti SMA, and apply it to the laminated rubber bearing to establish SMA-laminatedrubber compound bearing. Seismic response Experiments analyze the Frame structureseismic isolation system on SMA-laminated rubber compound bearing. By thenumerical simulation analysis of the isolation effect of the bearing, provides scientificbasis for project design. In this paper, the main research work and achievements are asfollows:(1) Studying the pseudo-elasticity transformation of Different Ni, Ti content ofshape memory alloy (SMA) material to find the perfect Ni, Ti ratio in SMA.(2) Improving the SMA-laminated rubber compound bearing，analyzing theworking principle and establishing the mechanics analysis model of it. Make thestructural dynamic response analysis experiment on the improved SMA-laminatedrubber compound bearing to analyze the isolation performance of it.(3) Making the numerical simulation analysis of base-isolated structure onSMA-laminated rubber compound bearing. By analyzing the numerical simulationcomparative data of six layers of steel frame structure in three different supportingconditions under earthquake excitation, to verify the design of SMA-laminated rubbercompound bearing has good isolation effect on frame structure.