Compressive behavior of post-heated circular CFST short columns externally strengthened with CFRP sheets

Wang, Kai; Chen, Yu; Wan, Jun; Han, Shaohua; Liao, Lican

doi:10.1080/01694243.2017.1387218

Cited by 9 publications

(8 citation statements)

References 22 publications

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“…Park and Paulay (1975) introduced the “Stiffness Secant Method” in the book “Reinforced Concrete Structures”, which is used to calculate the yield displacement when there is no obvious yield state. This method is also used by scholars to calculate the yield position of CFRP reinforced concrete columns (Wang, 2018). Therefore, the “stiffness secant method” was used to determine the yield position.…”

Section: Resultsmentioning

confidence: 99%

Effect of size on the eccentric compression performance of damaged square RC columns strengthened with CFRP: An experimental study

Zeng

et al. 2022

Advances in Structural Engineering

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The objective of this study was to experimentally analyze the effect of size on the eccentric compression performance of damaged square Reinforced concrete (RC) columns reinforced with Carbon Fiber Reinforced Plastic (CFRP) in a bid to improve the rationality of the design of CFRP-reinforced large concrete members. In the experiment, 18 square RC columns with proportional sizes were prepared, and the principle of the proportional changes in the size was strictly controlled. The effects of the size, eccentricity, pre-damage, and number of CFRP layers were considered in the experiment, and the bearing capacity, lateral deflection, rebar strain, CFRP strain, and failure modes of RC columns of different sizes before and after the reinforcement were studied. The experimental results showed that the CFRP reinforcement could improve the bearing capacity and deformability of damaged square RC columns under small eccentric compression; however, the reinforcement effect gradually decreased with increasing size. When the cross-sectional dimensions were 100, 200, and 300 mm, the bearing capacity increased by 26.17%, 17.27%, and 12.98%, respectively, and the ductility coefficient increased by 104%, 44.80%, and 35.20%, respectively.

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Section: Resultsmentioning

confidence: 99%

Effect of size on the eccentric compression performance of damaged square RC columns strengthened with CFRP: An experimental study

Zeng

et al. 2022

Advances in Structural Engineering

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“…Wang et al [ 51 ] demonstrated that the steel tube buckling and the CFRP sheet rupture were present in all the repaired samples. Four separate failure mechanisms were discovered based on the location of the buckling and the degree of the CFRP sheet rupture.…”

Section: Carbon Fiber-reinforced Polymer (Cfrp)mentioning

confidence: 99%

Structural Performance of Infilled Steel–Concrete Composite Thin-Walled Columns Combined with FRP and CFRP: A Comprehensive Review

Rashid

Bahrami

2023

Materials

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Fiber addition enhances the composite action between the steel tube and concrete core, increasing the strength of the concrete core. To better understand how fiber-reinforced infilled steel–concrete composite thin-walled columns (SCTWCs) behave, multiple investigations have been conducted using both experimental and analytical methods. This article provides a comprehensive review of SCTWCs’ confinement approaches using fiber-reinforced polymer (FRP) and carbon fiber-reinforced polymer (CFRP). In this research, the behavior and formation of FRP and CFRP wrappings of the SCTWCs are reviewed and discussed. The ability of the FRP to serve as a confining material and reinforcement for the columns has increased its use in columns applications. The FRP can be applied to reinforce the structures from the exterior. By applying the CFRP strips, the columns’ load-carrying capacity is improved up to 30% when compared with their corresponding un-strengthened columns. External bonding of the CFRP strips efficiently creates external confinement pressure, prevents local buckling of the steel tubes, and enhances the load-carrying capacity of the SCTWCs. The primary goal is to facilitate a clear understanding of the SCTWCs. This article helps structural researchers and engineers better understand the behavior of the SCTWCs that include the FRP and CFRP composites as external reinforcement. Future research directions are also suggested, which utilize previous research works.

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“…On the other hand, Shahidan et al (2016) concluded that wrapping more than one layer of FRP for severe fire-damaged specimens yielded result similar to specimens repaired with single layer of FRP (Figure 2.20). In Wang et al (2018)'s experiment, the distintive improvements were indicated by 62.41%, 43.83%, 85.47%, and 64.38% when the 4-CFRP layer (thickness of 0.167mm per layer) specimens subjected to temperature levels of 600, 800, 1000, 1100 o C, respectively.…”

Section: Behavior Of Fire-damaged Cfst Columns Confined By Frp Wrappingmentioning

confidence: 95%

“…Shahidan et al (2016)'s experiment, with the ASTM-E119 standard fire, had the similar results and even observed the rupture not only on mid-height but also near top and bottom of specimens. Wang et al (2018) conducted an experiment on twenty-one circular CFST short columns. Test variables are temperature levels and number of CFRP layers.…”

Section: Behavior Of Fire-damaged Cfst Columns Confined By Frp Wrappingmentioning

confidence: 99%

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Compression Behavior Of Fire-Damaged Concrete-Filled Steel Tubular Columns Confined With Fiber-Reinforced Polymer Sheets

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This research investigates the axial compression behavior of fire-damaged circular concrete-filled steel tube (CFST) stub columns externally confined with fiber-reinforced polymer (FRP) sheets. A total of 38 CFST specimens were tested under axial compression to investigate the load capacity, ductility, stiffness and failure mode of fire-damaged CFST columns before and after strengthening with FRP sheets. The test variables include the level of fire damage (no damage and 2-hour ISO standard fire), compressive strength of infill concrete (24MPa and 55MPa), type of FRP sheets (carbon and glass), and the number of FRP layers (0, 1, and 2 layers). The test results showed that 55-MPa CFST columns are more damaged by fire than 24-MPa CFST columns. However, confinement effectiveness due to FRP wrapping is similar. The level of strength enhancement due to FRP for fire-damaged CFST columns is lower than undamaged ones. In contrast to undamaged CFST columns, FRP cannot improve the stiffness of fire-damaged ones. Furthermore, an increase in the number of FRP layers improves the load capacity of specimens but deteriorates the ductility. The glass fiber sheets provide competitive strength enhancement and superior in ductility enhancement than carbon fiber sheets. An analysis of compression behavior of FRP-confined fire-damaged CFST columns is also proposed. Three main components include (1) two-dimensional finite element heat transfer analysis, (2) Post-fire mechanical properties of steel tube and concrete, and (3) analytical model that incorporates the confinement effect. The validity of the proposed model is shown by comparing the predicted load-strain relationships with experimental results.

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Compressive behavior of post-heated circular CFST short columns externally strengthened with CFRP sheets

Cited by 9 publications

References 22 publications

Effect of size on the eccentric compression performance of damaged square RC columns strengthened with CFRP: An experimental study

Effect of size on the eccentric compression performance of damaged square RC columns strengthened with CFRP: An experimental study

Structural Performance of Infilled Steel–Concrete Composite Thin-Walled Columns Combined with FRP and CFRP: A Comprehensive Review

Compression Behavior Of Fire-Damaged Concrete-Filled Steel Tubular Columns Confined With Fiber-Reinforced Polymer Sheets

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