Influence of advanced structural modeling and subduction mainshock-aftershock sequences on seismic fragility of RC structures

Salami, M. R., Kashani, M. M. and Goda, K. (2018) Influence of advanced structural modeling and subduction mainshock-aftershock sequences on seismic fragility of RC structures. In 11th National Conference on Earthquake Engineering 2018, NCEE 2018: Integrating Science, Engineering, and Policy. vol. 8, Earthquake Engineering Research Institute. pp. 5261-5271 .

Abstract

Current seismic codes and standards in practice aim at preventing collapse of structures but do not address serviceability and performance of the buildings after a major earthquake adequately. For instance, following a mainshock, ground motion activities, known as aftershocks, occur as a cluster, potentially causing incremental damage to structures whose seismic capacities may be reduced by the mainshock. This paper proposes an advanced structural modeling technique, which can simulate various features of cyclic deterioration and degradation in material and structural components using nonlinear fiber beam-column elements. The proposed model accounts for inelastic buckling and low-cycle fatigue degradation of longitudinal reinforcement, and can simulate the multiple failure modes of reinforced concrete structures under dynamic loading. Furthermore, a comprehensive ground motion selection accounting for subduction earthquakes, is implemented. Finally, a new set of fragility curves has been developed, which accounts for the structural modeling and aftershock effects. The proposed methodology significantly improves the accuracy of seismic risk and vulnerability assessment by reducing the uncertainties associated with structural modeling and variability of earthquake ground motions.

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Contributors

Author: M. M. Kashani

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