Techno Press

Steel and Composite Structures   Volume 21, Number 1, May20 2016, pages 93-107
Closed-form fragility analysis of the steel moment resisting frames
M. Kia and M. Banazadeh

Abstract     [Full Text]
    Seismic fragility analysis is a probabilistic decision-making framework which is widely implemented for evaluating vulnerability of a building under earthquake loading. It requires ingredient named probabilistic model and commonly developed using statistics requiring collecting data in large quantities. Preparation of such a data-base is often costly and time-consuming. Therefore, in this paper, by developing generic seismic drift demand model for regular-multi-story steel moment resisting frames is tried to present a novel application of the probabilistic decisionmaking analysis to practical purposes. To this end, a demand model which is a linear function of intensity measure in logarithmic space is developed to predict overall maximum inter-story drift. Next, the model is coupled with a set of regression-based equations which are capable of directly estimating unknown statistical characteristics of the model parameters.To explicitly address uncertainties arise from randomness and lack of knowledge, the Bayesian regression inference is employed, when these relations are developed. The developed demand model is then employed in a Seismic Fragility Analysis (SFA) for two designed building. The accuracy of the results is also assessed by comparison with the results directly obtained from Incremental Dynamic analysis.
Key Words
    probabilistic demand model; seismic fragility analysis; incremental dynamic analysis; generic steel moment resisting frame; Bayesian regression
Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, P.O. Box 15875-4413, Iran.

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