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

作　　者：黄有露 蒋欢军[1,2] 王勇 吴宸 HUANG Youlu;JIANG Huanjun;WANG Yong;WU Chen(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;China State Construction Engineering Corporation,Beijing 100029,China)

机构地区：[1]同济大学土木工程防灾减灾全国重点实验室,上海200092 [2]同济大学土木工程学院,上海200092 [3]中国建筑股份有限公司,北京100029

出　　处：《建筑结构学报》2024年第7期166-176,共11页Journal of Building Structures

基　　金：国家重点研发计划(2022YFC3803003)。

摘　　要：吊顶的边界条件对其抗震性能影响显著,对吊顶边界施加约束可有效降低吊顶的地震响应,但目前对不同约束类型边界吊顶的抗震性能仍缺乏系统研究。为此,对采用抗震夹约束边界的吊顶试件进行了足尺振动台试验,试验结果表明:对龙骨端部施加约束可避免其从边龙骨上脱落;主次龙骨节点容易率先发生破坏,且节点的破坏会进一步引起吊顶发生局部坍塌;试验过程中吊杆和龙骨构件始终保持弹性状态;相比于吊顶的边跨,吊顶中间跨的加速度和位移响应更大。同时,采用SAP2000软件对该吊顶的三维有限元模型进行了深入分析,模拟得到的吊顶加速度、位移和龙骨轴力与试验结果吻合良好,验证了该模型的正确性。进一步对比研究了两边固定两边半自由型、四边固定型和四边半自由型吊顶系统的地震响应。分析结果表明:在具有不同边界约束条件的吊顶中靠近端部的龙骨轴力均最大,在地震作用下该处的龙骨节点率先破坏;相比于两边固定两边半自由型吊顶,将吊顶的四边均设置为固定能够同时减小吊顶的加速度、位移和龙骨轴力,将吊顶的四边均设置为半自由虽然能够明显减小龙骨轴力,但加速度和位移均增大。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 accelerati

关 键 词：吊顶 振动台试验 有限元模拟 滞回模型 边界约束 

分 类 号：TU391[建筑科学—结构工程] TU317.1