Analysis And Application Of Static And Dynamic Characteristics On Lateral-torsional Coupling LRB Isolated System

In this dissertation, the shear force-displacement relationship of Lead RubberBearing (LRB) is researched firstly. At the base of existing equipment conditions, bydesigning the charger and working condition, the rubber is set in biaxially loadingwith various proportions. And then, the forces and distortions of LRB in the diffirentbiaxially force conditions are attained through the test. It is suggested in the test thatthe shear force-displacement relationship is bilinear model with Bauschinger effect,and the plastic deformation could meet the plastic flow rules.Based on the aboveresults, the mathematical function formula and the loading-static loading-unloadingconditions are proposed. Then the static characteristics of multiple LRB under thevarious loadings and the distributions are also analysed. It is drawn from theconclusions that: LRB is effective to decrease the displacement and angle of isolationlayer; the increase of isolation layer eccentricity is disadvantageous for isolation layersecurity; the plastic deformation and isolation layer angle could be restrained byincreasing the rigidity radius of isolation layer.At the same time, a simplified model and computational formulas of LRB on theconsidering of biaxial nonlinear deformation are proposed. Though analyzing thedynamics characteristics of lateral-torsional coupling LRB isolated system, theoptimization methods of arranging the stiffness and the damping are obtained. Ashaking table tests for seismic simulation of three-storey two-bay steel frame with thelateral-torsional coupling model is finished at last. It is compared with the finiteelement analysis model established by SAP2000. At last, two examples are taking forvalidating the research conclusion in this dissertation. The experimental data indicatesthat the LRB could reduce the earthquake translational and rotational motion responseof superstructure obviously. Basic displacement and acceleration of systems could becontained effectively by setting appropriate LRB. Making the place of stiffness centerand damping center close to the mass center of the substructure could decrease thetorsion-response of base-isolated buildings, and expanding the stiffness radius and thedamping radius could also reduce the torsion-response of base-isolated buildings.