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.
Highlights
fiber-reinforced polymer (FRP) composites have been used in the construction sector for over two decades due to their properties, such as high strength-to-weight ratio, high tensile strength and modulus, corrosion resistance, and durability
The lower limits of available strain data correspond to fco = 15 MPa (CFRP) and 18 MPa (GFRP)
In two previous studies [29,48], the performances of the specific strength models in the current literature were compared with the presented modified Hoek–Brown and Johnston strength criteria
Summary
FRP composites have been used in the construction sector for over two decades due to their properties, such as high strength-to-weight ratio, high tensile strength and modulus, corrosion resistance, and durability. The experimental studies are often in the cylinder strength range of fco = 20–50 MPa [1,4,5,6,10]. Under 20 MPa [4,5,8,21], and ultra-high strength concrete (UHSC) or ultra-high performance concrete (UHPC) data, over 100 MPa [22,23,24,25,26], are limited compared with the normal strength range (20 to 50 MPa). The modified strength criterion for FRP confinement [29] was verified with the data from fco = 7 to 108 MPa. the data beyond 108 MPa was very limited to calibrate this model. To complete the combined design oriented model, empirical and practical models with high accuracy are proposed for ultimate strengths and strains
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