Structural behaviors of deficient steel CHS short columns strengthened using CFRP

Karimian, Masoumeh; Narmashiri, Kambiz; Shahraki, Mehdi; Yousefi, Omid

doi:10.1016/j.jcsr.2017.07.021

Cited by 26 publications

(9 citation statements)

References 18 publications

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“…The typical axial load-axial shortening curves of square steel tube columns and PCWST columns are shown in Figure 6(d) and (e). The typical curve of square steel tube columns could be approximately divided into four segments, namely elastic, post-buckling, failed and post-failed stages, as shown in Figure 6(d), which was consistent with existing literature (Hu et al, 2021;Karimian et al, 2017;Liu et al, 2021;Nassirnia et al, 2015;Teng et al, 2012). Whilst the typical curve of PCWST columns approximately had six segments, namely elastic, post-buckling, descending, secondary ascending, failed and post-failed stages, as shown in Figure 6(e).…”

Section: Axial Load-axial Shortening Responsessupporting

confidence: 89%

Development and axial behavior of precast concrete wrapped square steel tube columns

Huang

et al. 2022

Advances in Structural Engineering

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Conventional thin-walled square steel tube columns are vulnerable to local buckling, carbon steel is susceptible to corrosion, and complicated fireproof measures increase the maintenance expenditures. As a result, a novel composite component, namely precast concrete wrapped square steel tube (PCWST) column is developed in this study. Seven PCWST columns subjected to axial compression load were investigated experimentally with different width-to-thickness ratios, specimen sizes, types and configurations of shear connectors in comparison to three square steel tube columns. The distinctive behavior of PCWST columns and square steel tube columns included failure modes, axial load-axial shortening responses, stiffness, buckling respond, load-carrying capacity and ductility were compared. Based on experimental results, nonlinear finite element (FE) models with full detailing were established and validated. Meanwhile, a simplified formula for predicting the load-carrying capacity of PCWST columns was proposed. Tested and simulated results show that steel tube and reinforced concrete (RC) encasement worked together for PCWST columns, and the head studs and the developed kinked rebars can enhance their interaction. The existing of RC encasement dramatically improves stiffness and load-carrying capacity, and it also delays the occurrence of local buckling of steel tubes.

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Section: Axial Load-axial Shortening Responsessupporting

confidence: 89%

Development and axial behavior of precast concrete wrapped square steel tube columns

Huang

et al. 2022

Advances in Structural Engineering

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“…Indeed, the externally bonded strengthening technique is effective for enhancing the performance of steel structures. It has been convincingly proven that this technique is able to increase: the compression capacity of short steel members [ 11 , 12 , 13 ], flexural capacity of steel beams [ 14 , 15 , 16 , 17 , 18 ], torsional capacity of steel members [ 19 , 20 ], load bearing capacity of steel shear wall [ 21 , 22 , 23 ], tensile capacity of steel plates [ 24 , 25 , 26 , 27 , 28 ], and also buckling capacity of long steel columns [ 29 , 30 , 31 ]. However, this strengthening technique is considered to have drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Buckling Capacity of Angle Steel Strengthened at Both Legs Using VaRTM-Processed Unbonded CFRP Laminates

et al. 2021

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Strengthening steel structures by using carbon fiber reinforced polymer (CFRP) laminates showed a growth trend in the last several years. A similar strengthening technique, known as adhesive bonding, has also been adopted. This paper presented a promising alternative for strengthening steel members against buckling by using vacuum-assisted resin transfer molding (VaRTM)-processed unbonded CFRP laminates. A total of thirteen slender angle steel members (L65x6), including two control specimens, were prepared and experimentally tested. The specimens were strengthened only at both legs and were allowed to buckle on their weak axes. The test showed that the unbonded CFRP strengthening successfully increased the buckling capacity of the angle steel. The strengthening effect ranged from 7.12% to 69.13%, depending on various parameters (i.e., number of CFRP layers, CFRP length, and angle steel’s slenderness ratio). Flexural stiffness of the CFRP governed the failure modes in terms of location of plastic hinge and direction of buckling curvature.

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“…Karimian et al [15] studied deficient hollow circular steel tubes with initial deficiencies in transversal or longitudinal directions and strengthened with CFRP under axial compressive loads. They [14,15] showed that there was a loss in ultimate bearing capacity because of deficiencies occurrence. They [14,15] proposed that using CFRP sheets compensated effectively this loss.…”

Section: Introductionmentioning

confidence: 99%

“…They [14,15] showed that there was a loss in ultimate bearing capacity because of deficiencies occurrence. They [14,15] proposed that using CFRP sheets compensated effectively this loss. Number of CFRP layers had significant effect on confinement effectiveness, gain in ultimate bearing capacity, delaying local buckling occurrence and decreasing stress concentration at the deficiency location.…”

Section: Introductionmentioning

confidence: 99%

Analysis of strengthened short deficient rubberized concrete-filled steel tubular columns

Elshazly

Mustafa

Fawzy

2020

Frattura Ed Integrità Strutturale

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Concrete-filled steel tubular (CFST) columns are broadly used in many structural systems for their well-known merits. This paper presents a finite element investigation on the structural behaviour of short circular deficient steel tubes filled with rubberized concrete (RuC), under axial compressive load. To accomplish this study, a validation of the proposed three-dimensional nonlinear finite element model; using ANSYS software; was carried out showing good accurateness. The analysis involved two different concrete mixes with 5% and 15% replacement of fine aggregate volume with crumb rubber particles. Columns strength reduction due to horizontal or vertical deficiencies was handled by increasing the thickness of the steel tube or wrapping the columns with two different types of FRP sheets. Five strengthening arrangements were studied using GFRP sheets and CFRP sheets. The results indicated that the ultimate bearing capacity of the RuCFST columns was increased with increasing the steel tube thickness. application of FRP sheets for strengthening the deficient RuCFST columns efficiently managed to retrieve the strength-lost due to either horizontal or vertical deficiency. Moreover, an enhancement in the columns’ ductility was observed especially when using GFRP sheets

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Structural behaviors of deficient steel CHS short columns strengthened using CFRP

Cited by 26 publications

References 18 publications

Development and axial behavior of precast concrete wrapped square steel tube columns

Development and axial behavior of precast concrete wrapped square steel tube columns

Experimental Investigation on the Buckling Capacity of Angle Steel Strengthened at Both Legs Using VaRTM-Processed Unbonded CFRP Laminates

Analysis of strengthened short deficient rubberized concrete-filled steel tubular columns

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