Study on Compressive Bearing Capacity of Concrete-Filled Square Steel Tube Column Reinforced by Circular Steel Tube Inside

Zhang, Yufen; Jun-hai, Zhao; Yuan, Weifeng

doi:10.3846/13923730.2013.799088

Cited by 34 publications

(13 citation statements)

References 8 publications

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“…e ultimate shear capacity of the joint was computed by the principle of limit equilibrium superposition. Based on the aforementioned shear capacity equations of the joint components, the shear load capacity V uC is obtained by equations (4)- (7) to assess the cracked vertical stiffener joint with shear failure in the panel zone. M uC is the computed bending resistance obtained from equation (10).…”

Section: Results and Validationmentioning

confidence: 99%

“…Since the confining effect of the concretefilled square steel tube is complex, the square tube is firstly equivalent to the circular steel tube using the method of the equal area [7]. Under the axial compressive force on the column, the circumferential tensile stress will decrease the shear capacity of the steel tube, so the circumferential stress σ sθ of the steel tube is considered in the stress state, as shown in Figure 4, where σ sz stands for the compressive stress under axial compression and τ s is the shear stress of the steel tube.…”

Section: Steel Tubesmentioning

confidence: 99%

“…In these several years, concrete-filled double steel tubular (CFDST) column has been applied as the section consisting of an outer steel tube and an inner steel tube, both filled with concrete. According to the reported research [6][7][8][9][10], the CFDST column exhibits notable constructional and mechanical benefits than the traditional CFST column, such as higher strength, higher ductility, better fireproof property, and stronger collapse resistance. It was firstly applied in the construction of the city hall in Wuppertal, Germany.…”

Section: Introductionmentioning

confidence: 99%

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Internal Force Transfer Mechanism and Bearing Capacity of Vertical Stiffener Joints in CFDST Structures

Zhang

Demoha

2019

Advances in Materials Science and Engineering

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is paper firstly studied the internal force transfer mechanism of vertical stiffener joints in concrete-filled double steel tubular (CFDST) frame structures on the basis of finite element modeling (FEM). Analytical models of shear force and bending moment were established through the appropriate material constitutive equations and equilibrium theory. en, the proposed models were used to predict and evaluate the shear and bending resistance of the vertical stiffener joint. Six joint specimens were tested to verify the rationality of the theoretical models, and the design suggestions for construction were subsequently discussed. e analysis indicated that the vertical stiffener together with the anchorage web played a dominated role in the internal force transfer mechanism. e computed bending resistance obtained by the tension model agreed well with the measured experimental data, and the shear resistance in the panel zone was sufficient to guarantee the ductile failure in the test. e vertical stiffener determined the plastic hinge so as to ensure the strong connection between the CFDST column and the steel beam. e ribbed anchorage web was an effective way of increasing the shear and bending resistance.

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Section: Results and Validationmentioning

confidence: 99%

Section: Steel Tubesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Internal Force Transfer Mechanism and Bearing Capacity of Vertical Stiffener Joints in CFDST Structures

Zhang

Demoha

2019

Advances in Materials Science and Engineering

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“…Hence, the STCC columns provide greater strength and ductility as well as the lower chance of steel tube buckling compared to the CFST columns (Yu et al 2010). STCC columns were first investigated by Tomii et al (1985Tomii et al ( , 1987, and since then, several research results on the STCC columns have been reported by different researchers in the literature (Han et al 2005(Han et al , 2009Zhang et al 2013;Xiao 2005;Dong, Ho 2015;Lee et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Experimental study and calculation of confinement relationships for prestressed steel tube-confined compressed concrete stub columns

Nematzadeh

Naghipour

Jalali

et al. 2017

Journal of Civil Engineering and Management

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Abstract. The current paper aims to present the results of an experimental investigation into the compressive strength of prestressed steel tube-confined compressed concrete (PSTC) stub columns. Here, to prestress the confined concrete, an innovative technique is utilized, in which the fresh concrete is subjected to compression while the steel tube is simultaneously pretensioned laterally by applying external pressure to the fresh concrete. A total of 135 confined specimens were tested under axial compressive loading to determine the confinement strength of the specimens. Moreover, new confinement relationships for the load-carrying capacity of the PSTC columns were proposed in terms of the prestressing ratio ( r P ), reference concrete strength ( c f ), and tube outer diameter to wall thickness ratio ( / D t ). Finally, a parametric study was conducted to evaluate the effect that the parameters r P , c f , and / D t have on the compressive strength of the prestressed confined concrete. The results indicate that the confined concrete prestressed by the present technique demonstrates significantly enhanced load-carrying capacity; however, increasing the prestressing level slightly affects it.

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“…As can be seen in Figure 2(b), the steel tube is constrained by inside concrete so it can bear some vertical load under the ultimate state of the whole column, η is assumed as the strength reduction factor of the steel tube, and then the stress state of steel tubes can be explicated by α)), substitute them into the stress expression of TSUST, the following expression can be obtained: Advances in Civil Engineering 5 en η was obtained as 0.65 by experimentation and statistical data [29], so the ultimate capacity of the steel tube can be calculated by…”

Section: Twin-shear Unified Strength Eory (Tsust)mentioning

confidence: 99%

Comparative Study of CFRP-Confined CFST Stub Columns under Axial Compression

Guo

Zhang

2018

Advances in Civil Engineering

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is paper presented a comparative study of concrete-filled steel tubular (CFST) stub columns with three different confinement types from carbon fiber reinforced polymer (CFRP): outer circular CFRP, inner circular CFRP, and outer square CFRP. e compressive mechanism and physical properties of the composite column were analyzed firstly aiming at investigating the confinement effect of CFRP. Ultimate axial bearing capacity of these three CFRP-confined CFST columns was calculated based on Unified eory of CFSTand elastoplastic limit equilibrium theory, respectively. Meanwhile, the corresponding tests are adopted to validate the feasibility of the two calculation models. rough data analysis, the study confirmed the ultimate strength calculation results of the limit equilibrium method were found to be more reliable and approximate to the test results than those of Unified eory of CFST. en axial bearing capacity of the pure CFSTcolumn was predicted to evaluate the bearing capacity enhancement ratio of the three types of composite columns. It was demonstrated that the averaged enhancement ratio is 16.4 percent, showing that CFRP-confined CFST columns had a broad engineering applicability. rough a comparative analysis, this study also confirmed that outer circular CFRP had the best confinement effect and outer square CFRP did better than inner circular CFRP. e confinement effect of CFRP increased with the decrease of concrete strength, and it was proportional with relative proportions of CFRP and steel under the same concrete strength.

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Study on Compressive Bearing Capacity of Concrete-Filled Square Steel Tube Column Reinforced by Circular Steel Tube Inside

Cited by 34 publications

References 8 publications

Internal Force Transfer Mechanism and Bearing Capacity of Vertical Stiffener Joints in CFDST Structures

Internal Force Transfer Mechanism and Bearing Capacity of Vertical Stiffener Joints in CFDST Structures

Experimental study and calculation of confinement relationships for prestressed steel tube-confined compressed concrete stub columns

Comparative Study of CFRP-Confined CFST Stub Columns under Axial Compression

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