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

journal contribution
posted on 03.09.2019, 00:00 by Hassan BajiHassan Baji, W Yang, C-Q Li
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. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

14

Issue

12

Start Page

1586

End Page

1597

Number of Pages

12

eISSN

1744-8980

ISSN

1573-2479

Publisher

Taylor & Francis, UK

Peer Reviewed

Yes

Open Access

No

Acceptance Date

20/02/2018

External Author Affiliations

RMIT University; Victoria University

Era Eligible

Yes

Journal

Structure and Infrastructure Engineering