边界自由型吊顶系统抗震性能有限元分析  

Finite element analysis of seismic performance of suspended ceiling system with free boundary condition

作　　者：蒋欢军[1,2] 黄有露 王勇 和留生[1,2] JIANG Huanjun;HUANG Youlu;WANG Yong;HE Liusheng(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 Co.,Ltd,Beijing 100037,China)

机构地区：[1]同济大学土木工程防灾国家重点实验室,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,北京100037

出　　处：《建筑结构学报》2023年第11期58-68,共11页Journal of Building Structures

基　　金：国家自然科学基金地震联合基金项目(U2239253)。

摘　　要：吊顶系统在历次地震中受损严重,但目前有关吊顶有限元计算模型的研究相对匮乏。为此,建立了能考虑龙骨连接点的非线性行为、面板与龙骨之间以及吊顶边界处存在的非线性行为的三维有限元计算模型。为了便于快速建立具有不同尺寸的吊顶模型,提出自动化建模方法。对该吊顶模型进行非线性时程分析,并将有限元模拟得到的位移、加速度和龙骨轴力与振动台试验结果进行对比。模拟结果与试验结果吻合良好,验证了该模型的正确性。进一步研究了吊杆直径、吊杆长度、龙骨端部与边龙骨之间间隙的宽度以及长宽比对吊顶地震响应的影响。分析结果表明:增大吊杆的直径和减小吊杆的长度均有利于降低吊顶的地震响应;龙骨端部与边龙骨之间间隙的宽度对吊顶的地震响应影响显著,减小龙骨端部与边龙骨之间间隙的宽度可提高吊顶的抗震性能;在吊顶的面积相同的情况下,吊顶的长宽比对吊顶地震响应的影响并不显著。Suspended ceiling(SC)system was damaged seriously in past earthquakes,while finite element studies on SC system is quite limited.A three-dimensional finite element model,which can consider the nonlinear behavior of grid connections,the nonlinear behavior between panels and grid members and the nonlinear behavior existing at the ceiling perimeter,was proposed.To facilitate establishing the ceiling models with different sizes,an automatic modeling method was developed.Nonlinear time history analysis was conducted on this SC model,and the simulated responses,i.e.,displacement,acceleration and axial force of grid members,were compared with the shaking table test results.The numerical simulation results agree well with the experimental results,which verifies the accuracy of the proposed model.Furthermore,the influences of the diameter and length of threaded rods,the width of peripheral gap between the grid end and wall angle,and the aspect ratio on the seismic performance of the SC were investigated.The analytic results show that increasing the diameter of threaded rods and decreasing the length of threaded rods are beneficial for reducing the seismic responses of the SC.The width of peripheral gap between grid ends and wall angles has a significant effect on the seismic responses of the SC.Decreasing the width of the peripheral gap can improve the seismic performance of the SC.In the situation that the area of the SC keeps constant,the influence of aspect ratio on the seismic performance of the SC is not significant.

关 键 词：吊顶 有限元模型 参数分析 抗震性能 

分 类 号：TU391[建筑科学—结构工程] TU311.41