The principle of earthquake resistant design is based on providing structural capacities that exceed the demands imposed by seismic actions by an adequate margin of safety. In essence, seismic demand and seismic capacity together define seismic performance. The degree of certainty in the prediction of the seismic demand and the capacity of the structural system determines the level of confidence of designing the system to perform as desired. The actual seismic performance, however, depends on several factors, including the system's configuration and construction methodology. In this study, seismic inelastic demands and capacities of the braced system of modular steel buildings are assessed by incremental dynamic analysis. The behaviour and response of this non-traditional structural system were examined by subjecting a representative nonlinear analytical model to an ensemble of 20 earthquake ground motions scaled to different intensity levels. The study predicted drift and ductility demands at different levels of ground motion intensity, and estimated the system's capacity at a collapse prevention level.
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