Shekhar, Shivang; Freddi, Fabio; Ghosh, Jayadipta; Lad, Devang; Chelapramkandy, Rifan; (2024) Corrosion-induced failure mode alterations and implications on seismic fragility of RC frames. In: Proceedings of the World Conference of Earthquake Engineering (WCEE 2024). International Association for Earthquake Engineering: Milan, Italy.

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Abstract

This study evaluates the influence of corrosion deterioration on the change in failure modes and subsequent impact on the seismic fragility of low-ductility reinforced concrete (RC) building frames. A threestory, three-bay, low-ductility RC frame is selected, and a detailed numerical model is developed by accounting for the nonlinear behavior of different components and time-dependent corrosion deterioration. The developed numerical model can capture the non-ductile failure modes of low-ductility RC frames designed without consideration of modern seismic design and detailing principles. Non-linear time-history analysis results reveal a change in the failure mode of RC columns within the frame from flexure to flexure-shear and an increase in the column peak drift due to corrosion. Time-varying probabilistic seismic demand models and damage state thresholds are used to develop seismic fragility curves. Results indicate that at the end of the design service life (50 years), corrosion deterioration significantly increases the seismic fragility by up to 38% for the Complete damage state.

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