Experimental study on the flexural behavior of large-scale rectangular concrete-filled steel tubular beams

Flor, Jacqueline Maria; Fakury, Ricardo Hallal; Caldas, Rodrigo Barreto; Rodrigues, Francisco Carlos Pinto; Araújo, Afonso Henrique Mascarenhas de

doi:10.1590/s1983-41952017000400007

Cited by 6 publications

(3 citation statements)

References 12 publications

(17 reference statements)

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“…The advantages of CFST structures over other composite systems include: the steel tube provides formwork for the concrete, the concrete prolongs local buckling of the steel tube wall, the steel tube prohibits excessive concrete spalling, and it adds significant stiffness to a frame compared to traditional steel frame construction [1]. Several researches were conducted to study the behavior of CFST composite beams [2][3][4], filled with recycled concrete [5][6], under acid attack [7], with unequal double spans [8], narrow width girders [9], and cold formed steel [10][11], in addition to the bond strength of composite columns [12] and the behavior of composite columns filled with high strength concrete [13][14], normal concrete [15][16][17], foamed and lightweight concrete [18], recycled concrete [19][20], and made with light gauge steel [21][22][23]. The main conclusions -proved that the CFST's recorded higher ductility and strength compared to the hollow steel sections in which both composite beams and columns sustained larger deformations.…”

Section: List Of Notationsmentioning

confidence: 99%

Behavior of light-gauge steel short columns filled with normal and lightweight aggregate concrete under concentric axial loading

AL-Zubaidi¹,

Abdel-Jaber²,

Hunaiti³

et al. 2022

J Appl Eng Science

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This study aims to investigate experimentally and numerically the behavior of light-gauge steel tubes filled with normal and lightweight concrete under axial loading. A total of thirty-five specimens, including thirty-two composite columns, two bare steel columns, and one normal-weight plain concrete column, were considered. The main variables in the tests were the concrete infill type (normal-weight and lightweight), the column’s length (1, 1.25, 1.5, 1.75-m), the steel tube thickness (2 and 2.4-mm), and the cross-section (100×100 and 150×150-mm). In addition, theoretical capacities were computed according to Eurocode 4, and a finite element analysis was conducted using ABAQUS software. The results showed that the behavior of lightweight filled steel tubes was similar to the normal weight filled tubes during the test; however, their capacities were lower compared to the normal weight filled tubes by a range of (1%-20%). Yet, lightweight filled steel tubes can achieve high axial loads. In addition, the axial capacity of all composite columns decreased with the increase of the column’s height and increased with the increase of both the cross-section and the steel thickness. Current code specifications of EC4 and the numerical results obtained from ABAQUS overestimated the capacities of the composite concrete-filled tubes by 3% and 14%, respectively; however, the EC4 was found to present close estimations to the experimental results.

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Section: List Of Notationsmentioning

confidence: 99%

Behavior of light-gauge steel short columns filled with normal and lightweight aggregate concrete under concentric axial loading

AL-Zubaidi¹,

Abdel-Jaber²,

Hunaiti³

et al. 2022

J Appl Eng Science

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“…It is generally agreed that the support of core concrete within the tube has a positive effect on the mechanical properties of CFST under bending, and its bearing capacity and ductility are significantly improved compared with empty steel tubes [ 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. In order to analyze the influence of the filling material strength on the mechanical properties of the flexural member, Kang et al [ 11 ] poured ordinary concrete ( f ck = 27 MPa) and aerated mortar ( f ck = 8 MPa) into the steel tube respectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Flexural Mechanical Properties of Ultrahigh Strength Concrete Filled Steel Tubes

et al. 2022

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Based on the project of the Guansheng Qujiang Bridge, the flexural mechanical properties of an ultrahigh strength concrete filled steel tube（UHSCFST）were discussed. A total of six UHSCFST beam specimens were tested, and the cube strength (𝑓cu) of the core concrete reached 80.3–115.2 MPa. The effects of concrete strength on flexural bearing capacity, deformation characteristics, and failure modes of UHSCFST specimens were discussed. Test results showed that the bending failure modes of UHSCFST specimens were the same as those of ordinary ones. The failure of UHSCFST specimens was attributed to excessive deflection, and local buckling occurred in the compression zone. Moreover, the bending capacity of the specimens did not decrease, even if they had yielded. Although ultrahigh strength concrete was poured, all of the specimens displayed outstanding bending ductility. The main function of core concrete was to provide radial restraint for the steel tube to avoid premature buckling. When the steel content of the specimen section was constant, the strength increases of core concrete had a slight impact on the bending failure mode, bearing capacity and ductility of UHSCFST specimen. The research results can deepen the understanding of the mechanical behaviors of the UHSCFST composite truss structure.

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“…The different of those 2 measuring results is the used of inclinometers that handle the angle of the rotation of the joint. This measuring can also be evaluated by potentiometers or linear variable differential transformers which is installed between the column and the beam end [7,14,15]. Previous study was conducting various experimental investigation performing the physical and mechanical performances of beam with concrete filled tube (CFT) column connections.…”

Section: Introductionmentioning

confidence: 99%

Analytical Study of Rectangular Concrete-Filled Tubes (RCFT) Connections using Finite Element Analysis under Cyclic Loading

2022

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Recent condition of the earthquakes model has shown that rectangular concrete-filled tubes (RCFT) with weld connection are so brittle. According to the studies conducted, large damages are due to the cracking of the weld between the beam flange and the column face and inducing concentrated stresses in this area. One of the novel alternatives to reduce the stress concentration at the panel zone could be the use of the reduce beam section (RBS). Given the enormous impact of seismic behaviour and ductility of the panel zone, RBS moves plastic hinges formation at an appropriate distance from column face. In this study, 2 major model of RCFT with and without RBS have been modeled using ABAQUS computer program and compared under cyclic behaviour. The obtained result of this study showed that using RBS is more ductile and implied a good stability. It also will consider having better ductility than other connections. GRAPHICAL ABSTRACT

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Experimental study on the flexural behavior of large-scale rectangular concrete-filled steel tubular beams

Cited by 6 publications

References 12 publications

Behavior of light-gauge steel short columns filled with normal and lightweight aggregate concrete under concentric axial loading

Behavior of light-gauge steel short columns filled with normal and lightweight aggregate concrete under concentric axial loading

Experimental Research on Flexural Mechanical Properties of Ultrahigh Strength Concrete Filled Steel Tubes

Analytical Study of Rectangular Concrete-Filled Tubes (RCFT) Connections using Finite Element Analysis under Cyclic Loading

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