建筑结构学报2025，Vol.46Issue(1)：30-50,21.DOI:10.14006/j.jzjgxb.2024.0004
双向地震作用下设置隔震楼盖的可恢复功能钢框架振动台试验研究及结构动力分析
Shaking table test and structural dynamic analysis for resilient steel frames with seismically isolated floor under bi-directional seismic action
摘要
Abstract
A seismically isolated floor was proposed to solve the problem of uncoordinated deformation between the floor and the resilient steel frame.In order to study the dynamic characteristics and resilience of the resilient steel frame of this seismic isolation building,a 3-story,2×2-span test model with a scaled-down scale of 1∶4 was designed and constructed,and the shaking table tests were completed for three seismic waves(horizontal bi-directional peak accelerations from 0.07g-0.75g),including Chi-Chi waves,El-centro waves,and artificial waves.The test results show that the maximum opening at the beam-column nodes of the structure is 5.76 mm and the rotation angle is 3.8％.Thus the seismically isolated floor can accommodate the"expansion effect"of the resilient steel frame while realizing the load carrying capacity and transmitting the horizontal force.Under the action of very rare earthquakes,the maximum inter-storey drift of the structure is 1/71 in the Y direction,1/147 in the X direction,and the maximum inter-story torsion angle is 1/151,and the maximum strain of the structure occurs at the footing of the center column of the first floor,with the maximum strain of 1.529×10-3,which does not exceed the elastic limit.And after the completion of the test,the beam-column opening,stress-strain,inter-story drift and inter-story torsion angle can return to the initial state of the structure under prestressing.Therefore,the resilient steel frame with seismically isolated floor has strong post-earthquake recovery ability under bidirectional seismic action and is not affected by torsion and lateral-torsional coupling action.A theoretical dynamic analysis model of the seismically isolated floor was proposed,and it was found that the dynamic response of the main structure was the smallest when the self-vibration frequency of the seismically isolated floor was the same as the self-vibration frequency of the main structure through the dynamic analysis.And the test was compared with the theoretical frequency,and the error of the 1st order and 2nd order frequency was not more than 5.92％,and the theoretical model can simulate the dynamic characteristics of the structure well.关键词
钢框架/隔震楼盖/可恢复功能结构/双向地震作用/振动台试验/扭转效应/动力特性Key words
steel frames/seismically isolated floor/resilient structures/bi-directional seismic actions/shaking table test/torsional effects/dynamic properties分类
土木建筑引用本文复制引用
张艳霞,武丙龙,张爱林,李杨龙,张昊,肖晨雨..双向地震作用下设置隔震楼盖的可恢复功能钢框架振动台试验研究及结构动力分析[J].建筑结构学报,2025,46(1):30-50,21.基金项目
国家自然科学基金面上项目(51770863). （51770863）
