Influence Of Design And Construction Defects On Seismic Reduction Behavior Of Isolation Structures

In view of the design and construction defects is commonly existing on isolation structures, the influence of seismic reduction of the change of horizontal stiffness of isolation layer and two main defects are discussed in this paper, the main research is as following:(1)The horizontal stiffness of isolation layer can be approximated as the one of the isolation structure, so the seismic reduction effect of isolation structure is directly affected by the horizontal stiffness of the bearings. The research of the equivalent stiffness of the non-standard design effect on isolation structure is shown through the finite element analysis software ETABS. Respectively, comparative analysis of horizontal stiffness of small range and large range changes is shown on the models under frequent earthquake and rare earthquake It compares the different horizontal stiffness of isolation structure of the inter-story shear force, absolute displacement,inter-layer displacement, story drift and peak acceleration of structures. The essay investigates the influence degree of the change of the upper structure when the horizontal stiffness of isolation layer varies in different ranges.(2)Through the finite element analysis software ETABS, the paper compares the dynamic responses of the non-standard design of bearing isolation structure models and normal isolation structure model based on the same isolation building mentioned before. It compares the changes of the inter-story shear force, absolute displacement, inter-layer displacement, story drift and peak acceleration of structures under frequent earthquake and rare earthquake. The influences even damage of the isolation layer and the upper structure is analyzed.( 3) A serious structural defect, the lift wells of isolation structure are not cut off from ground, is discussed deeply in this paper. It compares the dynamiccharacteristics of the non-cutting off lift wells isolation structure and the normal isolation structure and analyzes influences and even damages to the isolation layer and the upper structure. Based on a frame core tube isolation structure example,combined elastic-plastic analysis software Perform-3D, the comparative analysis of normal isolation structure and lift wells are not cut off isolation structure on inter-story shear force, absolute displacement, inter-layer displacement, story drift and peak acceleration of structures under rare earthquake is shown. Represented by AW1 seismic wave, the paper compares the elastic-plastic yield mechanism of this two models under rare earthquake.