Cross‐sectional and confining system unification on peak compressive strength of FRP confined concrete

Abstract

Despite the many axial confinement models already proposed for the determination of the peak compressive strength of fiber-reinforced polymer (FRP) confined concrete columns, they are, in general, applicable only to concrete columns of circular or square cross-section, with full or partial confinement arrangements. In this study, by proposing a cross-sectional and confining system unification approach, a new model is developed and calibrated based on a large test database.For the generalization of the cross-section and FRP-based confinement arrangement, the concept of confinement efficiency factor with a unified mathematical framework is adopted. By simulating experimental tests and comparing to the predictions of existing confinement models, the developed one demonstrates a very high reliability and suitable for design purposes by balancing the simplicity of the usage and accuracy.

A new approach for the strength interaction diagram of FRP strengthened square steel reinforced high strength concrete columns

“…[12][13][14] Fiber-Reinforced-Polymer (FRP) has been considered an ideal strengthening material for improving the deformation and load carrying capacity (LCC) of HSC columns due to its advantages of being free from corrosion with high fatigue resistance and stiffness, high strength-to-weight ratio, less maintenance and fast and easy installation. [15][16][17][18][19] Due to the great potential of FRP for strengthening HSC columns, a significant number of investigations have been devoted to FRP strengthened HSC columns and HSC filled FRP tube (fiber oriented in transverse direction only) in order to capture the stress-strain response and performance of HSC columns with FRP strengthening. 4,[20][21][22] However, the majority of these investigations paid attention to the response of circular HSC columns with FRP strengthening, 23,24 and only a few investigations were concerned with the response of square or rectangular HSC columns with FRP strengthening.…”

“…Existing steel reinforced HSC columns (SRHSC columns) may need strengthening or retrofitting due to material deterioration under extreme environmental conditions, an increase in the applied load (i.e., emerging heavier trucks in transportation structures) and the change in the functions of the structures 12–14 . Fiber‐Reinforced‐Polymer (FRP) has been considered an ideal strengthening material for improving the deformation and load carrying capacity (LCC) of HSC columns due to its advantages of being free from corrosion with high fatigue resistance and stiffness, high strength‐to‐weight ratio, less maintenance and fast and easy installation 15–19 …”

Analytical model to predict axial stress-strain behavior of heat-damaged unreinforced concrete columns wrapped by FRP jacket

“…Fallahpour et al [21] developed a new DOM in which, in addition to the evaluation of f cu and ε cu , simple formulations were suggested to obtain f ctr and ε ctr as input parameters. In general, for FRP fully confined concrete with square cross-section (FCSC) at room temperature, the following approaches are adopted to reflect the substantial influence of the shape effect on the confinement-induced improvements: i) addressing theoretically the arching action phenomenon based on the concept of confinement efficiency factor (Mander et al [22] and Lam and Teng [18] and Shayanfar et al [23]); ii) addressing empirically based on statistical analysis performed on a series of test dada (Wei and Wu [20], Cao et al [24] and Shayanfar et al [25]).…”

Smart Geosynthetics and Prospects for Civil Infrastructure Monitoring: A Comprehensive and Critical Review

“…mm protective coating materials were used for this purpose. OF sensors can also be incorporated into various fabric elements such as braided bars, fibre-reinforced polymers (FRPs), and glass-fibre-reinforced polymer (GFRP) bars for field applications[72][73][74]. Figure15a,bshow schematics of the OF-sensor-based FRP anchor and GFRP bars, respectively.…”