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Polymers 2015, 7(10), 1905-1917; doi:10.3390/polym7101489

A Design-Oriented Combined Model (7 MPa to 190 MPa) for FRP-Confined Circular Short Columns

1
Structural Systems Division, Architecture Faculty, Yildiz Technical University, Istanbul 34349, Turkey
2
Civil Engineering Faculty, Istanbul Technical University, Istanbul 34469, Turkey
*
Author to whom correspondence should be addressed.
Academic Editors: Alper Ilki and Masoud Motavalli
Received: 3 August 2015 / Revised: 15 September 2015 / Accepted: 21 September 2015 / Published: 28 September 2015
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Abstract

This study addresses a design oriented combined model to predict the ultimate strengths and ultimate strains in an extensive range of unconfined strength (7 to 190 MPa) for the axially loaded fiber-reinforced polymer (FRP)-wrapped circular short columns. Modified Hoek-Brown strength criterion, which was previously extended to FRP-confined concrete from 7 to 108 MPa, is revisited and verified. An empirical strength model beyond 108 MPa encompassing ultra-high strength concrete (UHSC) and ultra-high performance concrete (UHPC) data, as well as empirical strain models, are defined to accomplish the design oriented combined model. This article especially focuses on the verification of the proposed strain models. The assessment performances of those models for carbon FRP (CFRP) and glass FRP (GFRP) confinement are compared with specific models in the current literature. Strength and strain predictions for UHSC and UHPC are integrated into the design oriented combined model as well. The assessments on this model agree with the experimental results in high accuracy. View Full-Text
Keywords: confined concrete; FRP; strength; strain; design oriented model; Hoek-Brown; UHSC; UHPC confined concrete; FRP; strength; strain; design oriented model; Hoek-Brown; UHSC; UHPC
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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. (CC BY 4.0).

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MDPI and ACS Style

Girgin, Z.C.; Girgin, K. A Design-Oriented Combined Model (7 MPa to 190 MPa) for FRP-Confined Circular Short Columns. Polymers 2015, 7, 1905-1917.

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