建筑结构学报2024，Vol.45Issue(7)：166-176,11.DOI:10.14006/j.jzjgxb.2023.0217
双向水平地震作用下边界约束型吊顶系统抗震性能研究
Seismic performance of suspended ceiling system with boundary constraints under bidirectional horizontal earthquake excitations
摘要
Abstract
The boundary condition of suspended ceiling(SC)has significant influences on its seismic performance,and the seismic responses of SCs can be effectively reduced by imposing constraints on the SC boundaries.However,the systematic studies on the seismic behavior of the SCs with different types of boundary constraints are still limited.Therefore,full-scale shaking table tests were conducted on an SC specimen with boundary constraints provided by seismic clips.The test results indicate that the unseating of grid ends is avoided when the grid ends are restrained.The main tee-cross tee connections are prone to be damaged first,and the failure of these connections will further lead to the local collapse of the SC.In the test threaded rods and grid members keep elastic.Compared to the side span of the SC,the acceleration and displacement responses at the middle span of the SC are larger.In addition,an in-depth analysis was conducted on the three-dimensional finite element model of the SC system with the aid of software SAP2000.The simulated acceleration,displacement,and axial force of grid members agree well with the corresponding experimental results.The accuracy of the numerical model is verified.Moreover,comparative study was performed on the seismic responses of the SC with two adjacent fixed boundaries and the other two semi-free boundaries,the SC with four fixed boundaries,and the SC with four semi-free boundaries.The analysis results show that the grid ends near the ceiling boundary have the largest axial force in the SC system with different types of boundary constraints,causing the surrounding grid connections to be damaged first during earthquakes.Compared to the SC with two adjacent boundaries of fixed and the other two boundaries of semi-free,setting the four sides of the SC to be fixed can simultaneously reduce the ceiling acceleration,displacement,and axial force of grid members.Besides,setting the four sides of the SC to be semi-free can evidently decrease the axial force of grid members,but the acceleration and displacement of ceiling increase.关键词
吊顶/振动台试验/有限元模拟/滞回模型/边界约束Key words
suspended ceiling/shaking table test/finite element simulation/hysteretic model/boundary constraint分类
建筑与水利引用本文复制引用
黄有露,蒋欢军,王勇,吴宸..双向水平地震作用下边界约束型吊顶系统抗震性能研究[J].建筑结构学报,2024,45(7):166-176,11.基金项目
国家重点研发计划(2022YFC3803003). （2022YFC3803003）
