Study On The Mechanical Properties And Isolation Performance Of Three-dimensional Isolation Support

Earthquakes are a sudden and devastating natural disaster that endangers the safety of human life and property.With the development of economy and society,earthquakes bring more and more disasters to human beings.According to statistics,90% of the deaths in the earthquake were caused by the collapse of buildings.In order to reduce earthquake disasters,researchers from all over the world are studying how to improve the seismic safety of housing construction.Engineering practice has proved that the use of isolation technology is a more common and effective method to enhance the seismic performance of buildings.After several years of research,it has been found that vertical ground motions are strong in epicenters and seismogenic faults,and the damage they bring is also very large,so it is necessary to adopt certain methods to control this type of disaster within a certain range.However,at present,some commonly used isolation techniques only aim at horizontal earthquake action,but cannot effectively isolate vertical earthquake action.Therefore,it is necessary to take effective measures to further control the three-dimensional seismic response of the structure.Based on the research results of many scholars and researchers,this paper proposes a tandem three-dimensional seismic isolation support,and puts forward some new insights on the technology.The following is the main content of this research:(1)With the support of the seismic isolation bearing theory,a new three-dimensional seismic isolation bearing is proposed,which is composed of a common laminated thin rubber bearing and a thick rubber bearing in series.Through the reasonable form of the support structure,the decoupling phenomenon of the vertical and horizontal isolation of the support occurs.The horizontal deformation of the earthquake is borne by the ordinary laminated rubber,and the vertical deformation of the earthquake is borne by the thick rubber,thus achieving three-dimensional isolation.(2)The parameter design method of three-dimensional isolation support is proposed,Combined with the relevant specifications of laminated rubber bearings,a vertical rigidity correction formula for thick rubber bearings is proposed to determine the detailed dimensions of each component of the bearings.(3)The use of ABAQUS finite element software to establish a new type of threedimensional isolation bearing overall model,And the mechanical properties of the support were studied.The research results show that the simulated value of the vertical stiffness of the seismic isolation support is consistent with the theoretical correction value,and it has good compression performance and shear performance.(4)Use SAUSAGE structural analysis software to analyze the seismic dynamic response of ordinary buildings and buildings with three-dimensional isolation bearings.Then find out the difference between their displacement response,acceleration response and other indicators.Finally,it is found that the reasonably-arranged isolation bearings,using three-dimensional isolation bearings,can not only extend the natural vibration period of the building,but also slow down the acceleration response of the building.The interlayer shear force and interlayer displacement angle are lower than those of non-isolated structures.After the use of threedimensional seismic isolation support,the structural seismic response is obviously controlled,which can significantly reduce the horizontal and vertical seismic response,and the seismic isolation effect is remarkable.