Numerical modeling and experimental validation for suspended ceiling system with free boundary condition

Abstract

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.