Nonlinear behaviour of corroded RC columns under cyclic loading

Kashani, Mohammad, Crewe, Adam, Alexander, Nicholas and Lowes, Laura N (2015) Nonlinear behaviour of corroded RC columns under cyclic loading. In 7th International Conference on Seismology and Earthquake Engineering. International Institute of Earthquake Engineering and Seismology. p. 245 .

Abstract

Many structures in regions of high seismicity are also exposed to corrosive environments. Corrosion of reinforcing steel is the most common reason for the premature deterioration of RC structures. Recent experimental testing shows thatcorrosion can significantly diminish the strength and drift capacity of RC elements (e.g. beams and columns). Therefore, material deterioration due to corrosion must be considered in assessing the earthquake vulnerability of existing RC structures in corrosive environments. In recently developed methods of nonlinear analysis of RC structures subject to seismic loading, a lot of attention has been given to the fibre element technique. In this method the material nonlinearity is modelled using uniaxial constitutive material models of steel and concrete. Accordingly, there has been a series of comprehensive experimental investigationsconducted at the Earthquake Engineering Research Centre (EERC) of the University of Bristol. In these experiments the nonlinear constitutive behaviour of corroded reinforcing bars subject to monotonic (tension and compression) and cyclicloading with the effect of buckling have been investigated. The experimental results showed that corrosion has a substantial influence on the ultimate capacity and ductility of corroded bars in tension and significantly reduces the buckling capacity of corroded bars in compression. It was also observed that corrosion has a significant influence on low-cycle high amplitude fatigue degradation of corroded bars under cyclic load history

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Contributors

Author: Mohammad Kashani

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