Abstract

Info

Title:: Research on Mechanical Properties of Rubber Bearings with Initial Rotation Under Horizontal Seismic Forces in Different Directions

Author(s):: XU Zhong-gen; ZHU Xiang-sheng; DENG Chang-gen; School of Civil Engineering， Guangzhou University

Keywords:: large-span spatial structure; rubber bearing; initial rotation; horizontal stiffness; fortification intensity

Abstract:: In order to analyze the bearing rotation of large-span spatial structures,the horizontal mechanical properties of the rubber bearings with relative rotation between upper and lower faces were studied. The finite element software ABAQUS was used to analyze the horizontal mechanical properties of rubber bearings without initial rotation. Then the horizontal mechanical properties of rubber bearings with initial rotation were analyzed when the horizontal displacement loading in X direction, Y direction and 45° direction. Finally, the varying trends of horizontal stiffness and shear strains were obtained. The results show that when shear strains are small, the horizontal stiffness of bearings decreases with the increases of the rotation at first, and then increases at X direction and 45° direction. When shear strains are large, the horizontal stiffness decreases with the increases of the rotation angle at first, and then increases at Y direction.Comparing with rubber bearings without initial rotation, the horizontal stiffness of the rubber bearings with initial rotation is larger, which makes the seismic isolation effect under seismic fortification intensity worse. In the range of engineering stress, the vertical pressures have little effect on the horizontal stiffness under three different horizontal displacement loading directions.