Numerical Simulation And Shaking Table Test Of Segment Isolation System Connected With Adjacent Structure Dampers

China has a large number of adjacent buildings.Seismic isolation technology can effectively reduce the seismic response of structures.Most of the existing shock-absorbing means of adjacent buildings are in a single form,that is,only one isolation method(Base isolation,layer isolation or segmented isolation),or a method of energy consumption(Connecting the damper to dissipate energy)is used.The corresponding seismic isolation effect may be better under the specific seismic wave type.But the actual earthquake is a mixed waveform,which comprises a plurality of frequency-domain seismic waves.The single form of the fortification structure is unable to meet the vibration reduction requirements of a variety of ground motions.Aimed at the vulnerability of isolated structures to long periodic wave failure,the vulnerability of connected damper structures to Pulse Wave failure,a hybrid passive control system is proposed in this paper,that is the passive control system combining Segment isolation with adjacent structure connection Energy dissipation,in order to resist actual ground motion.The shaking table test of this new type of structure hasn't been widely carried out in China before.Based on this,the hybrid passive control structure is taken as the research object.Through numerical simulation and shaking table test,the main research contents and achievements are as follows:(1)The dynamic responses of segmented isolated structure and hybrid passive control structure under ordinary ground motion,long period ground motion and pulse type ground motion are numerically simulated and analyzed.It is found that the displacement of isolation layer is larger under long period ground motion,and it is possible to exceed the limit.Hybrid passive Control can effectively reduce displacement of isolation bearing,preventing structural failure due to failure of support.When the middle isolation layer of the adjacent main structure is located near the foundation layer,the comprehensive ability to deal with all kinds of seismic waves is better.And with the increase of the middle seismic isolation layer,the displacement of the two isolation supports increases,and the acceleration response of the structure increases.(2)A model of adjacent structures with a scale of 1:16 is established,in which the main structure is equipped with base isolation and inter-story isolation,and the slave structure is a non-isolated structure.The viscous damper is connected with the main structure at the top of the slave structure to form a mixed passive control structure.For the normal seismic wave,long period seismic wave and pulse type seismic wave with the input acceleration peak values of 0.20 g,0.40 g and 0.60 g respectively,it is found that the long period seismic wave has the greatest influence on the structure.When the inter story isolation of the main structure is set in the middle position,the comprehensive effect of reducing and isolation is the best.(3)Seven single-story steel frame models mentioned above are designed and fabricated.According to the four-story main structure,they are assembled from the three-story structure.The shaking table tests of the above-mentioned system under the corresponding conditions are carried out,and the results are compared with those obtained by numerical simulation.The results show that the variation law of the seismic response of the structure is basically the same and the error is small,which verifies the correctness of the general law obtained by the numerical analysis.Furthermore,the segmented isolated structure and the pure steel adjacent structure are obtained by changing the assembling mode,and the better isolation effect of the hybrid passive control structure is verified under the corresponding ground motion.