Input Earthquake Ground Motion Research And Isolation Performance Analysis Of Base Isolation Structure

With the development of society, especially the last few year, isolated structuresexcellent isolation effect in the earthquake and isolation technology has been more andmore attention. After decades of development, isolation technology in the theoreticalanalysis, experiments, isolation bearings designed so has gradually matured. This articleincludes studies two aspects: the first part is the study of the selected input groundmotion isolation structure dynamic analysis, the second part is irregular eccentricstructure using lead core rubber isolation, friction sliding isolation, isolation of thecombination Comparative analysis of the isolation effect. Analysis described as follows:①Selesting Choose a reasonable seismic waves, is crucial to the process when theseismic analysis. Therefore, this isolated structure for the current dynamic analysis toselect the input ground motion isolation according to the structure of T1before selectingor using classical seismic wave input seismic isolation structure studies presented byT1-election wave structures were isolated after isolation process analysis structure. Alarge number of actual ground motion records as the basis, using Dual-band wavemethod to elect two groups of waves according to vibration period T1of seismicstructure and period T1of isolated structure, Classifiing seismic waves according70%of total energy time. Using SAP2000establish a framework structure model, the inputselected records history analysis, study the structural response parameter (between thebottom shear, floor layer vertex displacement and maximum displacement). The resultsshow that the structure of isolation by wave after T1-election analysis, structuralanalysis of the response was significantly less than the resultant dispersion of seismicresponse of structures isolated by former T1-election wave dispersion. When long heldunder seismic isolation structure holding short extent of the damage is greater than theseismic action, Long duration earthquake is more unfavorable for isolated structures. So,the proposed addition to elec wave by T1and Tgfor isolated structure, the need toconsider time the ground motion you select at least one long-held earthquake seismicwave.②Using SAP2000to establisht "L"-shaped eccentric structure model, were usedtheSameIsolated friction sliding isolation and combined isolation, study the structuralresponse parameter (the interlayer shear layer displacement, inter-layer torsion angle),compared to three isolated effects of different isolation measures and changes in the coefficient of friction bearing model or two parameters, analyze the impact of the twoparameters of isolated structures isolation effect. The results show:UsingtheSameIsolated,sliding isolation,combined isolation,can effectively reduce lowsuperstructure seismic response,and can effectively reduce the effect of reversing theeccentric structure;Rational choice model of LRB, sliding bearing frictioncoefficient,combined isolation can have better isolation effect than TheSameIsolatedand friction sliding isolation. Recommending irregular eccentric structure usingcombined isolation for isolation design.