Parameter Design And Application Analysis Of Three-Dimension Isolation Bearing

In this thesis, parameter design and application analysis on a three-dimensional seismic isolation bearing (MTFGZ) are carried out. The relative parameters, which affect the performance of the bearing, are designed and analyzed according to the specification of the springs. Based on which, the structure of the bearing is advanced to possess reasonable lifting load resistance and rotation capacities. Finally, the bearing is applied in a single-layer spherical lattice shell for seismic isolation, the parameters of which affecting the seismic response of the structure are analyzed. All which will provide suggestions for the bearing design when applied in lattice shell structure. The main achievements in this thesis are as follows:(1) By performing parameter design and analysis of the bearing, the criteria for choosing springs and other relative parameters are provided. Firstly, the design procedures of horizontal spring, vertical spring and the whole bearing are studied and summarized, making it convenient for practical designing and program making. Secondly, according to the specification of the springs, the properties of the bearing are investigated, such as the bearing capacity, restoring capacity, horizontal and vertical isolation performances, etc. and the affections on which are discussed when considering different kinds of springs and their combination modes. Finally, the criteria for choosing spring's modes and the relative parameters of the bearing are provided by analyzing the different performances of the bearings which are designed according to the conditions of the practical engineering.(2) The structure of the MTFGZ bearing is advanced for its reasonable lifting load resistance and rotation capacity. Based on the parameter analysis of the bearing, its structure is developed by changing its installation process and adding ring block resistance, making it possessing reasonable lifting load resistance and rotation capacity. And its lifting load resistance capacity, designed according to the practical case, is simulated and studied by ABAQUS finite element program, the results from which show that the advanced bearing possesses high stiffness, sharing good property in lifting load resistance.(3) The MTFGZ bearing is applied in a single-layer spherical lattice shell for seismic isolation, the effectiveness of its isolation capacity and isolation design are verified and some suggestions for its application in lattice shell structure are proposed. According to the seismic response and the isolation targets of the structure, the MTFGZ bearings are designed. Taking into account of different site classifications, seismic waves and intensity inputs, the seismic responses of the structure using MTFGZ bearing are compared with that of using fixed hinge bearing. Also, the displacements and periods of the designed target are compared with those of the isolated structure. The results show that the design targets are effective and the bearing shares good property in seismic isolation, but the site classifications and the vertical frequency of the seismic waves should be significantly considered for bearing design.(4) Parameter analysis of the bearing applied in the single-layer spherical lattice shell is carried out, verifying the decoupling of its horizontal and vertical stiffness and providing the suggestions of relative parameter choice. Based on the study of the isolated structure in chapter 4, different kinds of MTFGZ bearings are designed to investigate the effects of the horizontal and vertical stiffness on the seismic response of the structure, considering different site classifications, seismic waves and intensity inputs. The results show that the horizontal and vertical stiffness of the bearing decouples obviously. And according to the seismic responses of the structure under different cases, the horizontal displacement determining the horizontal stiffness and the isolation coefficient determining the vertical stiffness are suggested when designing the bearing in lattice shell structure.