Seismic Fragility Curves for Steel and Reinforced Concrete Frames Based on Near-Field and Far-Field Ground Motion Records

Abstract

This study presents the fragility curve for steel and concrete frames based on near-field (NF) and far-field (FF) ground motion records. The fragility curve is calibrated to the incremental dynamic analysis (IDA) curve based on building materials and frame heights. The frames are designed according to Eurocodes. This study uses seven ground motion records for NF and another seven records for FF. The five performance levels prescribed by FEMA-273 are used as structure performance benchmarks in generating the IDA curve. Results based on the NF and FF records indicate that a three-storey steel frame is stiffer than a concrete frame. By contrast, the results for a six-storey structure show that a steel frame is more suitable than low-rise and mid-rise frames. The fragility curve results show that the probability of reaching or exceeding a specified damage state can be determined.