Seismic Response Analysis Of Super High Rise Isolated Structure With Anti Lift Off And Anti Overturn Device

In recent years,with the increasing number of high-rise buildings,isolation technology has been widely applied to high-rise and super high-rise buildings.At home and abroad,high-rise buildings using isolation technology show superior shock absorption effect.When the isolation technology is applied to super high-rise buildings,under the action of external forces such as ground motion,it is very easy to overturn and the bearing is very easy to yield.At present,the anti overturning device is arranged in the isolation layer to solve this problem.The research on the application of anti overturning devices to high-rise isolated buildings is in progress,and the research on the seismic response characteristics of super high-rise isolated buildings with anti overturning devices is rare.In this paper,three kinds of numerical simulation models are established by using the finite element software SAP2000,which are super high-rise seismic buildings,super high-rise isolation buildings without anti overturning devices and super high-rise isolation buildings with anti overturning devices.The anti overturning problem of super high-rise isolation buildings is studied.In this paper,the characteristics of tension and compression stiffness of lead rubber bearing are simulated by parallel connection of rubber isolato unit and gap unit.Hook unit simulates anti overturning device.According to the ground motion parameters of the proposed site,three groups of seismic records(El Centro wave,Ctralif wave and Ren Gong wave)are selected,considering the multiple occurrence,fortification and anti overturning device Dynamic analysis of four seismic levels is carried out in rare and rare cases:(1)the change of bearing axial force and vertical lift deformation before and after anti overturning device is analyzed;The change of the axial force at the bottom of the column and the shear force at the bottom of the column corresponding to the support;The displacement difference and turning angle of the isolated layer are calculated;(2)Input three groups of seismic waves to calculate the horizontal damping coefficient;By comparing the floor acceleration amplification factor,story displacement angle and story shear force of super high-rise seismic isolated building with anti overturning device and super high-rise seismic isolated building with anti overturning device,the damping effect of super high-rise seismic isolated building with anti overturning device is analyzed;(3)The dynamic time history analysis of long period remote source ground motion records is carried out to evaluate the characteristics of seismic response.The results show that:(1)the vertical bearing capacity and horizontal displacement of the isolation bearing and the anti lifting anti overturning device meet the requirements,and the overall stability check meets the requirements under rare and extremely rare earthquakes;The anti lifting and anti overturning device plays an important role in rare and extremely rare horizontal ground motions,and it is feasible to use this device;(2)The results show that the axial tensile stress and vertical uplift deformation of each isolation bearing are greatly reduced,the hysteretic curve of lead rubber bearing is more plump and smooth,and the hysteretic curve of sliding plate bearing is slightly disordered;The deformation trajectory of the four corners of the building is the same,and the anti lift and anti overturn device has no effect on the horizontal deformation of the isolation layer;(3)The results show that the displacement difference and overturning angle of the far and near ends of the isolation layer are significantly reduced,and the decline of the shear wall is greater than that of the frame;(4)The average value of the horizontal damping coefficient calculated by inputting three groups of seismic waves is small,and the seismic response analysis of the isolation building with anti lift and anti overturn device and the anti-seismic building is compared:the seismic response of the super high-rise isolation building with anti lift and anti overturn device is significantly lower than that of the superstructure of the non isolation building,and the damping effect is more obvious with the increase of seismic intensity;Under the action of remote source long-period ground motion records,the isolation layer can meet the safety checking calculation,greatly reduce the seismic response,and has good damping effect.