Bayesian Fragility for Nonstructural Systems
Abstract
This report presents a method to calculate the fragility of a nonstructural system supported by a structure subjected to earthquakes. A Bayesian framework is developed for this purpose for a system of gypsum walls supported by an 8-story building. The analysis accounts for the uncertainty in the behavior of gypsum walls, which is modeled to match the experimental results. Fragilities are plotted against scale factors corresponding to PGA, PSa, and PSd. ATC-58 fragilities are also calculated and plotted. The proposed method is applicable to other nonstructural system such as piping and ceiling, provided that the associated definitions of damage states and the corresponding experimental data sets are available.