Seismic Performance Of Tridimensional Parking Structure And Parameter Optimization Of Horizontal Damping Support

The high-rise parking structure have become the priority to solve the parking problem in metropolitan area because of its land-saving,high-efficiency and security.Because of lower inherent damping of the high-rise three-dimensional parking structure,it is inefficient to solve the vibration problem by reinforcing structure.In this paper,the high-rise three-dimensional parking structure is researched by controlling the horizontal displacement of the structure under horizontal excitation.The main research contents of this paper include:The dynamic characteristics and seismic performance of tridimensional parking structure are analyzed.A parametric finite element model of tridimensional parking structure is presented in this paper,modal analysis and elastic time history analysis of tridimensional parking structure under the horizontal excitation are carried out as well.The results show that the foundamental frequency of high-rise tridimensional parking structure is lower,and the horizontal deformation of the structure is obvious under horizontal excitation.Therefore,a damper should be introduced to respond control.Parameter optimization of horizontal damping support are carried out.The horizontal damping support of the original research and development is applied to the high-rise tridimensional parking structure in this paper.The plane shear angle of the parking zone and the plane shear angle of the lifting zone under the horizontal excitation is taken as the performance index.Based on the dynamic time history analysis,the effect of supporting bar layout,damping coefficient and energy loss coefficient of the visco-elastic material on response control of horizontal damping support is studied.After comparison and analysis,the optimal level of horizontal damping support parameters are determined.Results show that when the optimal supporting bar layout is applied and damping coefficient is 200kN·s m^-1 and energy loss coefficient is 5.0,the peak plane shear angle of the parking zone under different two-dimensional seismic waves decrease 65.67%,51.72%and 51.59%respectively,the peak plane shear angle of the lifting zone is reduced by 73.23%,72.51%and 75.36%respectively.The synchronization of the beam and column deformation in the structure plane is enhanced,and the working environment stability of the lifting equipment is improved significantly and the horizontal damping support is in good working condition.The universality of optimal parameter setting scheme is studied.Via analyzing the response control efficiency of the dampers under different structural parameters,the universality of the optimal parameter setting scheme under different structural layers and structure geometric parameters is verified.The results of this study are helpful for the design of viscous dampers to control the response of high-rise tridimensional parking structure.