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Evaluation of maximum likelihood fitting for fragility analysis of code-designed steel plate shear walls

The steel plate shear wall (SPSW) presents a viable structural system to resist lateral forces during earthquakes. Although often designed based on the assumption that only steel plates resists lateral forces, the surrounding boundary moment resisting frame from capacity based design provides considerable capacity reserve. Fragility analysis studies the probability of collapse, or some other limit state of interest, of a structure as a function of certain ground motion intensity measure. Collapse fragility analyses obtained through non-linear incremental dynamic analyses (IDA) under a set of specified earthquake ground motions provide a rational basis for determining building system performance and response parameters. This study evaluates the maximum likelihood method (MLM) for fragility analysis of SPSWs when the SPSWs are close collapse. A total of six SPSWs are designed based on current seismic provision. Forty-four far field ground motions from FEMA P695 are used to account for source type, site conditions, and source magnitude. The accuracy and computational savings of the MLM is discussed and compared with nonlinear IDA results. Findings from this study provide insights into the effectiveness of the MLM method for fragility analysis.

Author(s):

Ramin Barghi    
San Francisco State University
United States

Cheng Chen    
San Francisco State University
United States

Benjamin Kean    
San Francisco State University
United States

Shihang Guo    
San Francisco State University
United States