Optimal FRP-strengthening strategy for corrosion-affected reinforced concrete columns

Baji, H, Yang, W and Li, C 2018, 'Optimal FRP-strengthening strategy for corrosion-affected reinforced concrete columns', Structure and Infrastructure Engineering, vol. 14, no. 12, pp. 1586-1597.

Document type: Journal Article
Collection: Journal Articles

Title Optimal FRP-strengthening strategy for corrosion-affected reinforced concrete columns
Author(s) Baji, H
Yang, W
Li, C
Year 2018
Journal name Structure and Infrastructure Engineering
Volume number 14
Issue number 12
Start page 1586
End page 1597
Total pages 12
Publisher Taylor & Francis
Abstract Deterioration of reinforced concrete (RC) structures is unavoidable after their long time in service, with corrosion being the major mechanism of deterioration. In order to ensure safety of deteriorated structures, an effective rehabilitation plan is essential. Although considerable research on strengthening of RC structures using fibre-reinforced polymers (FRPs) composites has been undertaken, more is on the methods of strengthening and effects of corrosion on strength of RC columns than that on the prediction of optimum strengthening time. This paper presents a methodology for determining the optimal strengthening time and the required number of FRP layers for corrosion-affected RC structures with application to columns. The methodology is based on the time-dependent reliability method and the renewal theory. An example is provided to illustrate the application of the proposed methodology. It is found in this study that an optimum point for the formulated objective function exists, and that outcomes of optimisation problem, i.e. strengthening time and number of required FRP layers, are sensitive to corrosion rate. The significance of the proposed methodology is that it provides guidance for practitioners and asset managers to decide when and how to strengthen deteriorated structural members.
Subject Civil Engineering not elsewhere classified
Keyword(s) corrosion
fibre-reinforced polymers
reinforced concrete columns
time-dependent reliability
DOI - identifier 10.1080/15732479.2018.1476560
Copyright notice © 2018 Informa UK Limited, trading as Taylor & Francis Group.
ISSN 1573-2479
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