As one type of commonly used non-structural component in public buildings, suspended ceilings (SCs) may suffer severe damage or even collapse under earthquakes. However, convincing numerical simulation on the SC is scarce due to its strongly nonlinear behavior. A refined numerical model for SC with free boundary condition is developed based on a full-scale shaking table test in this study. Grid connections, between main tees, main tee and cross tee, and cross tee and sub cross tee, are the main source of strong nonlinearity in SC. Their hysteretic models are built according to the cyclic loading tests first. The nonlinear impact and friction behavior at the ceiling perimeter are also considered. By conducting time history analysis of SC, the simulated responses of acceleration, displacement, and axial force of grid members are analyzed and compared with shaking table test results. The comparison results demonstrate that the proposed model is capable of predicting the seismic responses of the SC. Lastly, parametric analysis is conducted to investigate the influence of the width of peripheral gap, the length and diameter of threaded rods, and the thickness of panels on the seismic performance of SC. Outcome of this study is beneficial for modeling and seismic design of SC system.

作为公共建筑中常用的一种非结构构件，吊顶（SCs）在地震作用下可能遭受严重破坏甚至倒塌。然而，由于其强烈的非线性行为，在 SC 上令人信服的数值模拟是稀缺的。本研究基于全尺寸振动台试验，建立了具有自由边界条件的 SC 的精细数值模型。主三通、主三通和十字三通之间的电网连接, 和 cross tee 和 sub cross tee 是 SC 中强非线性的主要来源。他们的滞后模型首先根据循环加载测试建立。天花板周边的非线性冲击和摩擦行为也被考虑在内。通过对SC进行时程分析，对网格构件的加速度、位移和轴向力的模拟响应进行分析，并与振动台试验结果进行比较。比较结果表明，所提出的模型能够预测 SC 的地震响应。最后，通过参数分析，研究了周边间隙宽度、螺杆长度和直径以及面板厚度对抗震性能SC的。本研究成果对SC系统的建模和抗震设计是有益的。