附设间隙阻尼减震装置的高位隔震连体结构振动台试验研究OA北大核心CSTPCD

A gap damper device was proposed to control the displacement of isolation bearing of the corridor when a high-level isolation connected structure was subjected to rare earthquakes.A twin tower connected model structure with an aspect ratio of 6 was firstly designed.The corridor and tower were connected by the isolation only and by the combination of the isolation and gap damper device,respectively.The two structural systems were tested by a series of shaking table tests.The far-field El Centro wave and pulse-like near-field Chi-Chi and Kobe waves were selected as seismic excitations.The horizontal displacement of the isolation bearing,the force and displacement responses of the gap damper device,the acceleration response of the corridor,and the acceleration and displacement responses of the tower structure were measured.The control effect of the gap damper device on the displacement of isolation bearing under rare and extremely rare earthquakes,as well as the influence of the gap damper device on the corridor and tower structure were analyzed.The results show that the gap damper device can effectively control the isolation bearing displacement under rare and extremely rare earthquakes.Under the rare earthquakes with intensity 8,the maximum displacement of the isolation bearing can be reduced by up to 59.61％.The gap damping device generates a severe impact between the transmission shaft and limit ring,inducing high-frequency vibration energy into the corridor structure.The horizontal acceleration responses of the corridor are amplified,and the vertical acceleration responses are more serious.Under the far-field earthquakes,the activation of the gap damping device increases the floor acceleration response and inter-story drift of the tower structures to some extent,but it do not cause adverse effects on the tower structures.Under the near-field earthquakes,where the velocity pulse period is close to the fundamental natural period of the overall structure,the gap damping device provides some seismic control effects on the tower structures.When the peak ground acceleration of the ground motion is 0.40g,the peak acceleration and peak inter-story drift of the tower structure are reduced by 24.09％and 31.7％,respectively.