PREDICTION SEISMIC PERFORMANCE (LCF) OF CORRODED REINFORCING STEEL BARS

1 APOSTOLOPOULOS Charis
Co-authors:
1 KONSTANTOPOULOS George 1 KOULOURIS Konstantinos
Institution:
1 Department of Mechanical and Aeronautical Engineering, University of Patras, Laboratory of Technology and Strength of Materials, Greece, charrisa@upatras.gr
Conference:
25th Anniversary International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 25th - 27th 2016
Proceedings:
Proceedings 25th Anniversary International Conference on Metallurgy and Materials
Pages:
537-542
ISBN:
978-80-87294-67-3
ISSN:
2694-9296
Published:
14th December 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
110 views / 28 downloads
Abstract

In this study, the impact of corrosion in S400 grade of reinforcing steel bar as for the mechanical performance on seismic loads (low-cycle fatigue LCF) was investigated. The mechanical performance and life expectancy of S400 grade of reinforcing steel bar on seismic loads was evaluated based on the strength degradation (reduction of maximum strength) during its loading time period, under corrosion or not circumstances. The results show that corrosion level, as a parameter, has a negative influence on the seismic performance of steel bar. Therefore, a phenomenological hysteretic model of non-corroded and corroded steel bar was also conducted considering two levels of imposed deformation (±2.5 % & ±4 %). The effectiveness of material model was validated through comparison with experimental data being in a good agreement with the observed experimental results. At this point, a lower limit value (threshold) of upper tensile and compression load was also introduced, in order to predict the performance and the useful life duration (number of cycles) of a Reinforced-Concrete (R/C) member. That could lead to warning signs of awakening in order not to use unreliable parts of R/C in existing structures, prior to their life expectancy.

Keywords: Steel rebar, corrosion, seismic performance, material model, life expectancy

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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