RESPONSE ANALYSIS OF EXISTING RC BUILDINGS WITH CORRODED REBARS UNDER EARTHQUAKE SEQUENCES

Di Sarno, L ORCID: 0000-0001-6244-3251 and Pugliese, F ORCID: 0000-0003-1829-3473 (2021) RESPONSE ANALYSIS OF EXISTING RC BUILDINGS WITH CORRODED REBARS UNDER EARTHQUAKE SEQUENCES In: 17th WORLD CONFERENCE ON EARTHQUAKE ENGINEERING, 2020-9-14 - 2020-9-18, Japan.

Text 2c-0286 (1).docx - Published Version Download (1MB)

Abstract

Multiple consecutive earthquakes are unpredictable events with uncommon characteristics that occur in many countries around the world and affect significantly the seismic response of reinforced concrete (RC) structures causing often more damage if compared to single strong ground motions. Accumulation of structural damage, the increment of the state of deformation, loss of stiffness and strength of structural components are the main consequences of earthquake sequences. Limited research has been conducted on the inelastic response of RC structures subjected to multiple earthquakes and very few studies can be found on this phenomenon when structures are exposed to aggressive environments. As a result, earthquake sequences and corrosion penetration have become extremely important for their impact on the seismic response of existing RC structures. This study aims at investigating the nonlinear dynamic performance of a typical existing four-storey RC building with corroded smooth rebars under a sequence of mainshock and aftershock. Both stress-strain models for the concrete and the steel reinforcements were modified according to the level of the corrosion rate. The seismic performance of the corroded building was evaluated through the use of a finite element approach by performing nonlinear dynamic analyses. The structure was subjected to different levels of corrosion and parameters such as inter-storey drift checked against the limit States of Limited Damage, Significant Damage and Near Collapse defined via nonlinear static analyses. Seismic fragility curves are shown for the selected limit states and each level of corrosion. Finally, the nonlinear response of the corroded RC building under multiple earthquakes indicates that there is a need for studying this phenomenon to provide relevant indications of the structural-safety level for conventionally-designed RC structures subjected to earthquake sequences and highly-corrosive environments.

Item Type:	Conference Item (Unspecified)
Depositing User:	Symplectic Admin
Date Deposited:	03 Nov 2020 10:26
Last Modified:	05 Feb 2026 22:43
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3105691
Disclaimer:	The University of Liverpool is not responsible for content contained on other websites from links within repository metadata. Please contact us if you notice anything that appears incorrect or inappropriate.