Impact of as-recorded mainshock-aftershock excitations on seismic fragility of corrosion-damaged RC frames

Dizaj, Ebrahim Afsar and Salami, Mohammad R and Kashani, Mohammad Mehdi (2023) Impact of as-recorded mainshock-aftershock excitations on seismic fragility of corrosion-damaged RC frames. In: Life-Cycle of Structures and Infrastructure Systems. CRC Press, pp. 3356-3363. ISBN 9781003323020

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The experience from the past seismic events shows that the accumulated damage induced by the previous earthquakes increases the vulnerability of Reinforced Concrete (RC) structures. Moreover, RC structures constructed in aggressive environments such as those located in the coastal area suffer from the ageing and degradation phenomena. Therefore, the concurrent influence of successive seismic hazards and corrosion-induced degradation might result in undesired seismic failure of these RC structures. From this perspective, this paper investigates the seismic performance of RC frames affected by chloride-induced corrosion of reinforcements subject to as-recorded (real) mainshock-aftershock excitations. To this end, a prototype RC frame is analysed under real mainshock-aftershock ground motions at different times since corrosion initiation. First, a suite of mainshock-aftershock records is selected from a unique database using the Conditional Mean Spectrum (CMS) methodology. Then, an advanced numerical model capable of tracking the low-cycle fatigue degradation and inelastic buckling of reinforcements is used to simulate the nonlinear dynamic behaviour of the studied frames with different levels of corrosion. Finally, the seismic performance and fragility of the considered structures are evaluated using the outputs of nonlinear static and incremental dynamic analyses. The results show that the vulnerability of corroded reinforced concrete frames is significantly increased under successive earthquake events. Moreover, the results of this paper show that the probability of failure of corrosion-damaged RC frames depends crucially on the magnitude of the aftershocks.

Item Type: Book Section
Identification Number:
28 May 2023Published
Subjects: CAH10 - engineering and technology > CAH10-01 - engineering > CAH10-01-01 - engineering (non-specific)
Divisions: Faculty of Computing, Engineering and the Built Environment > College of Built Environment
Depositing User: Gemma Tonks
Date Deposited: 02 Apr 2024 14:38
Last Modified: 20 Jun 2024 11:45

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