Title: Analytical Modelling of RC Members Subjected to Reinforcing Bar Corrosion and Buckling

Author(s): Fabio Di Carlo, Alberto Meda, and Zila Rinaldi

Publication: Symposium Paper

Volume: 326

Issue:

Appears on pages(s): 88.1-88.10

Keywords: bending moment-curvature relationship; buckling phenomenon; corrosion effect; durability; RC structures

DOI: 10.14359/51711071

Date: 8/10/2018

Abstract:
The durability of RC structures can be sharply reduced by the corrosion of steel rebars. This phenomenon is of great concern, since it is one of main causes of degradation in RC structures, almost in non-exceptional conditions. Furthermore, the corrosion effects can influence the seismic behaviour of RC structures, leading to dangerous strain localizations and variations of strength distribution and rotation capacity. This problem is amplified if, due to the corrosion of the reinforcement (longitudinal and/or transversal), a buckling of the steel bars takes place. This situation was highlighted by the authors in previous works, through experimental tests developed on RC columns, subjected to artificial accelerated corrosion. The main objective of the paper is the evaluation of the influence of the buckling of the corroded rebars on the local behaviour of RC elements. To this purpose, a simplified analytical model is developed, for the definition of the bending moment-curvature relationship. The worst conditions for the development of failure modes related to bar buckling are highlighted and the main parameters governing the problem are pointed out.