An experimental study on seismic performance levels of highly corroded reinforced concrete columns

Abstract

In the literature, only one empirical model is available as a nondestructive method for the prediction of seismic performance levels of corroded reinforced concrete (RC) columns as a function of the initial corrosion crack width at lower corrosion levels. Because of the ruptured transverse reinforcement bars at higher corrosion levels, the structural behavior may turn brittle in terms of shear failure. Therefore, in this study, higher corrosion levels for a different concrete strength level from that empirical model were studied. To do this, four RC columns were subjected to accelerated corrosion, and the widths of initial corrosion cracks were measured. The corroded RC columns were then tested under combined constant axial load and cyclic lateral displacement excursions. After the cyclic loading test, the actual corrosion levels at each reinforcement bar were obtained by extracting the reinforcement bars from the concrete. Test results showed that the prediction of seismic performance levels of corroded RC columns based on initial corrosion crack widths were limited owing to the nonlinear increase in the crack width with the increase in the corrosion levels. New empirical models were developed to predict the remaining energy capacities and seismic performance levels of the corroded RC columns.

Corrosion Rate-Based Adjustment of Plastic Hinge Parameters of Corroded RC Elements

“…𝐷 𝑒𝑡 𝜃 displacement and plastic rotation corresponding to CL=0. which has been also reported in the literature [44]. This trend is not perceived under Friuli accelerogram (Fig.…”

Experimental and numerical investigation on seismic performance of corroded RC columns of low-strength concrete

“…It can be derived that reinforcement corrosion should have detrimental impact on seismic performance of RC structures. Therefore, experimental studies of corroded RC columns were abundantly conducted during the past few years since they provide easier and more direct investigations on the structural behavior of corroded RC buildings (Dai et al 2021;Meda et al 2014;Ma et al 2012;Yalciner and Kumbasaroglu 2020;Celik et al 2022;Rajput and Sharma 2018;Guo et al 2015;Yuan et al 2018;Deng et al 2022;Ma et al 2018;Zhou et al 2020;Zhao et al 2021;Koçer et al 2021;Yang et al 2016;Chang et al 2020;Rinaldi et al 2022;Li et al 2018;Goksu and Ilki 2016). For instance, Meda et al (2014) performed cyclic loading tests on two full-scale column specimens to investigate the influence of corrosion on the structural behavior, and revealed that corrosion of rebars causes a significant reduction in the structural ductility.…”

“…As revealed in the abovementioned test results, with the increase of axial load, the failure mode of corroded columns changed with the decreased ductility and energy dissipation. The axial compression ratio of columns in many existing buildings constructed before the issue and adoption of seismic design code often exceeds 0.6 or even much larger due to the use of lowstrength concrete (Celik et al 2022;Huan et al 2020;Bru et al 2018). However, in previous experimental researches, most of the corroded RC columns were designed with low axial compression ratio, e.g., 0.1 in Guo et al (2015), 0.13 in and Rinaldi et al (2022), 0.17 in Zhou et al (2020) and 0.2 in Goksu et al (2016).…”