Near-fault seismic vulnerability assessment of corrosion inflicted steel moment resisting frames

Abstract

Corrosion is a critical factor affecting the durability, safety, and structural integrity of steel frame buildings, particularly in environments with high humidity, saline exposure, or industrial pollutants. This study explores the near-field seismic vulnerability of steel moment-resisting frames accounting for the effects of corrosion. Numerical models with and without accounting the corrosion effects are generated for steel frame buildings with various storey heights and bay span lengths, and the demand model is estimated through the generation of incremental dynamic analysis resulted curves. The demand is convolved with the capacity models to generate the fragility curves, and the impact assessment is carried out through a systematic comparison of the fragility curves. The fragility curves based on the inter-storey drift and the residual drift ratios revealed that the seismic vulnerability of the steel moment resisting frames increases irrespective of the bay span length and the frame height. The current study underscores the importance of considering corrosion and near-field seismicity for reliable risk assessment of steel structures situated in these regions.