Study On The Influence Of Combined Application Of Multiple Support Types On Seismic Properties Of High-Rise Buildings

At present,the combined isolation technology has been applied to the field of high-rise buildings,but the current code does not clearly stipulate many problems in the seismic isolation design of high-rise shear wall structures,and the code lags behind the engineering practice.In order to study different isolation systems The effect of application in high-rise shear wall structure,the limit of height-width ratio of high-rise shear wall structure isolation design and the height limit of high-rise shear wall isolation structure,this paper mainly carries out the following work:（1）The equation of motion of the multi-particle shear system is established,and seven seismic waves are selected according to the specification requirements,including five natural waves and two artificial waves.（2）Giving an real engineering project as an example,based on ETABS,the traditional seismic and isolating structures are established,and the primary and secondary directions of the seismic waves are selected for unidirectional respectively input,and the time history analysis is proceed to figure out the influence of distinct seismic isolation systems in the high-rise shear wall structure.Seismic isolation effect,and the safety check calculation of seismic isolation layer.（3）Establish the isolation model of lead core-natural rubber isolation system with different aspect ratios,carry out the safety check of the isolation layer,and obtain the applicable aspect ratio range for the isolation design of high-rise shear wall structures.（4）Establish a large height-to-width ratio over-limit seismic isolation model and an anti-seismic model,conduct time history analysis under rare earthquakes,and compare the results to study the height limit of seismically isolated structures.The research results show that the code stipulates that the height-to-width ratio of the building should be less than 4 when the seismic isolation design is adopted,but this requirement is somewhat conservative for the shear wall structure,and the height-to-width ratio limit of the shear wall seismic isolation structure under different isolation systems is also different.The isolation structure using the lead core-natural rubber isolation system can also guarantee the safety of the isolation layer in the case of an aspect ratio of 5.43,and the isolation structure using the lead core-elastic sliding plate bearing isolation system has an aspect ratio of 5.74.The safety of the seismic isolation layer can still be guaranteed.Seismic isolation design of buildings in areas with 8（0.2g）degrees seismic intensity using lead core-elastic slide board bearing isolation system,the rare ground motion response does not exceed the rare ground motion response of the same structure in the area of the fortification intensity of 7 degrees.The height limit of the seismic structure can be appropriately relaxed.