Abstract
In this study the seismic collapse safety of five different types of SMA-RC beam-column joints is compared with regular steel-RC beam-column joints through numerical analysis. Nonlinear static push over analysis is performed for all types of beam-column joints to determine the performance limit states of these connections. From the push over analysis, a damage state framework is proposed considering the maximum drift limit corresponding to different performance criteria such as cracking, yielding, spalling, and crushing. Through incremental dynamic analysis (IDA), collapse fragility curves are developed to assess the collapse performance of SMA-RC beam-column joints and conventional steel-RC beam-column joints using twenty earthquake ground motions. The collapse safety assessment is expressed in terms of collapse margin ratio considering maximum and residual drift as the demand parameters. The collapse margin ratio of SMA-RC beam-column joints is 20–30% greater than steel-RC beam-column joints in terms of maximum drift, and 25–60% higher in terms of residual drift.
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