吊顶龙骨节点和拼接点荷载-位移恢复力模型

Force-Displacement Hysteretic Model for Grid Joints and Splices of Suspended Ceiling

摘要:

开展了吊顶主龙骨拼接点、主次龙骨节点和边节点的低周往复加载试验，总结了龙骨节点和拼接点的破坏模式，分析了龙骨节点和拼接点的承载力与变形性能，采用有限元软件OpenSEES中的Pinching4模型建立了龙骨节点和拼接点的荷载?位移恢复力模型。该恢复力模型与试验得到的荷载?位移滞回曲线比较一致，且随着循环加载圈数的增加，两者的累积耗能变化规律也比较一致。在此基础上，进一步建立了各类龙骨节点和拼接点的通用恢复力模型，并给出龙骨节点和拼接点通用恢复力模型参数的建议值。

关键词:吊顶;龙骨节点和拼接点;抗震性能;试验研究;荷载‒位移恢复力模型

Abstract:

Low cycle tests on the main tee splices， main-cross tee joints and peripheral joints of suspended ceiling were conducted. The failure modes of grid joints and splices were summarized. The load-bearing ability and deformation capacity of grid joints and splices were analyzed. The Pinching4 model in OpenSEES software was used to establish the force-displacement hysteretic model for grid joints and splices. The force-displacement hysteresis curve based on the hysteretic model is consistent with that obtained from the experiments， and as the number of cyclic loading increases， the change rule of the accumulated energy dissipation based on the hysteretic model agrees well with the corresponding experimental results. On this basis， the generic hysteretic model for various grid joints and splices was further established， and the recommended values of generic hysteretic model parameters for grid joints and splices were given.

Key words:suspended ceiling;grid joints and splices;seismic performance;experimental study;force-displacement hysteretic model