Experimental analysis of a mechanical shear connector in concrete filled steel tube column

ABSTRACT This work includes an analytical and experimental study of the structural behavior of shear connectors in composite columns, composed of concrete-filled circular hollow section. For this study was adopted a structural bolt like a shear connector in order to verify the validity of the analytical expressions in ABNT NBR 16239: 2014 [1]. Was carried out a series of push-out tests, fixing the outer diameter of the hollow section and varying the thickness, the bolt diameter, the strength of concrete and the hole dimension. Analysis of the results shows that is possible to use this type of shear connector. The Brazilian prescriptions results are conservative and may be adjusted to provide strength capacity value closest to the experiment.

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Compressive strengths of concrete-filled double-skin (circular hollow section outer and square hollow section inner) aluminium tubular sections

Advances in Structural Engineering ◽

10.1177/1369433219842381 ◽

2019 ◽

Vol 22 (11) ◽

pp. 2418-2434 ◽

Cited By ~ 1

Author(s):

Feng Zhou ◽

Ben Young

Keyword(s):

Concrete Strength ◽

Element Model ◽

Numerical Results ◽

Outer Skin ◽

Hollow Section ◽

Composite Columns ◽

Double Skin ◽

Stub Column ◽

Circular Hollow Section ◽

Stub Columns

Experimental and numerical investigations of concrete-filled double-skin aluminium stub column with a circular hollow section as the outer skin and a square hollow section as the inner skin are presented in this article. A test program was carried out to study the influences of aluminium tube geometric dimensions and concrete strength on structural performance and strength of composite columns. A series of composite columns was tested on outer circular hollow section tubes and inner square hollow section tubes; the spaces between them had been filled with concrete of different nominal cylinder strengths of 40, 70 and 100 MPa. The tubes were fabricated by extrusion using 6061T6 heat-treated aluminium alloy having a nominal 0.2% proof stress of 240 MPa. A non-linear finite element model was developed and verified against experimental results. The test and numerical results were compared with the design strengths to evaluate the applicability of the design rules in the American specifications for aluminium and concrete structures. In addition, the proposed design equations, developed by the authors for concrete-filled double-skin aluminium tubular stub columns with circular hollow section as both outer and inner skins, were used to calculate the design strengths and compared with the experimental and numerical results obtained in this study. The proposed design equations also predicted the ultimate strengths of the concrete-filled double-skin aluminium tubular stub columns accurately with circular hollow section as the outer skin and square hollow section as the inner skin.

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Experimental Investigation to Evaluate the Behavior of Concrete-Filled Steel Tubular Columns under the Effect of the Distribution of the ‎Total Steel Area between the Internal Concrete Core and the External Steel Tube

International Journal of Engineering Research in Africa ◽

10.4028/www.scientific.net/jera.54.86 ◽

2021 ◽

Vol 54 ◽

pp. 86-99

Author(s):

Yasser Riffat Tawfic ◽

Ahmad Saudi A. Sayed ◽

Mohamed A. Eid ◽

L.M. Abd El-Hafaz

Keyword(s):

High Efficiency ◽

Load Capacity ◽

Steel Tube ◽

Cross Sectional Area ◽

Experimental Program ◽

Sectional Area ◽

Concrete Core ◽

Cross Sectional ◽

Composite Columns ◽

Shear Connectors

Composite columns are generally installed in high-rise buildings and bridges. As well as being smaller and lighter than conventional reinforced concrete columns, composite columns offer high efficiency and ductility. In this research, experimental and analytical studies were carried out to investigate the optimal distribution of the ‎total steel area of the Concrete-Filled Hollow Steel Tube (CFHST) columns; the experimental program included 20 CFHST columns. ‎The main variables of the experimental study were the distribution of the total steel cross-sectional area over the internal concrete core (steel reinforcement) and the external steel tube, the cross-sectional shape, the width-to-breadth ratio t/b, and the presence or absence of shear connectors. In addition, using equations of different codes, comparison was conducted between the experimental and analytical results. For a constant steel cross-sectional area, the use of internal steel bars and external steel tubes, together with the use of shear connectors, was found to exhibit a better ultimate load capacity, stiffness, and ductility for the CFHST columns.

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Seismic behavior and strength capacity of steel tube-reinforced concrete composite columns

Earthquake Engineering & Structural Dynamics ◽

10.1002/eqe.2354 ◽

2013 ◽

Vol 43 (4) ◽

pp. 487-505 ◽

Cited By ~ 23

Author(s):

Xiaodong Ji ◽

Hongzhen Kang ◽

Xingchen Chen ◽

Jiaru Qian

Keyword(s):

Reinforced Concrete ◽

Seismic Behavior ◽

Steel Tube ◽

Composite Columns ◽

Strength Capacity

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Behaviour and Strength of Innovative Steel Concrete Columns with SCC

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.984-985.684 ◽

2014 ◽

Vol 984-985 ◽

pp. 684-692 ◽

Cited By ~ 1

Author(s):

Natesan Balasubramani ◽

R. Thenmozhi

Keyword(s):

Concrete Columns ◽

Steel Tube ◽

Outer Diameter ◽

Composite Columns ◽

Composite Action ◽

Tubular Columns ◽

Failure Patterns ◽

Stub Columns ◽

Strength And Ductility ◽

Simplified Formula

In this paper, totally 7 innovative steel concrete composite columns were investigated for axial load and reported. 6 of them were modified DSHCFT columns consisting only outer skin tube and butting concrete and the remaining one was Double Skinned Hollow Concrete Filled steel Tubular columns having outer and inner steel tube (DSHCFT), which was annularly in-filled with Self-Compacting Concrete (SCC). The concrete grade and yield strength of steel tubes used were respectively M35 and 250MPa. The ratios of outer tube diameter to its thickness were 34 to 36. The length to outer diameter (aspect ratio) and the hollowness ratio were from 2.4 to 4.5 and from 0.35 to 0.5 respectively. Mechanical behaviour in term of stiffness, confinement, ultimate strength and ductility were discussed. Load Vs mid-span deflection diagrams, failure patterns of the specimens are presented. The existence of composite action between steel and concrete and confinement of concrete were experimentally evidenced. Suitability of two existing design codes is verified. For the design of the modified DSHCFT Stub columns with SCC and DSHCFTs, a possible simplified formula is suggested.Keywords: Failure mode, Stiffness, ductility, confinement, Ultimate load, Simplified formula.

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Ultimate Axial Strength of Concrete-Filled Double Skin Steel Tubular Column Sections

Advances in Civil Engineering ◽

10.1155/2019/6493037 ◽

2019 ◽

Vol 2019 ◽

pp. 1-19 ◽

Cited By ~ 6

Author(s):

S. İpek ◽

E. M. Güneyisi

Keyword(s):

Gene Expression Programming ◽

Estimation Error ◽

Axial Loading ◽

Steel Tubes ◽

Hollow Section ◽

Composite Columns ◽

Axial Strength ◽

Proposed Model ◽

Double Skin ◽

Circular Hollow Section

This study aims at proposing a new model for evaluating the ultimate axial strength of concrete-filled double skin steel tubular (CFDST) composite columns. For this, a total of 103 experimental data regarding the ultimate strength of CFDST columns under axial loading were collected from the previous studies in the literature. All CFDST columns consist of two steel tubes being outer and inner circular hollow section. The model presented herein was developed by using gene expression programming. For this, the yield strength, diameter, and thickness of both outer and inner steel tubes, the compressive strength of annulus concrete, the length of the specimen, and the ultimate axial strength of the columns were utilized as the parameters. Assessment of the obtained results indicated that the generated model had a good performance compared to the existing models by the previous researchers and the equations specified in the design codes. The high value of R2 and narrow ranged fluctuation of the estimation error for the ultimate axial strength of the CFDST columns were also achieved through the proposed model.

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Experimental Investigation on Behavior of Composite Open Web Steel Joists

Al-Nahrain Journal for Engineering Sciences ◽

10.29194/njes.21030393 ◽

2018 ◽

Vol 21 (3) ◽

pp. 393-404

Author(s):

Ali Farhan Hadeed ◽

Laith Khalid Al-Hadithy ◽

Riyadh J. Aziz

Keyword(s):

Concrete Slab ◽

Light Weight ◽

Shear Connector ◽

Test Results ◽

Variable Parameters ◽

Shear Connectors ◽

Shear Connection ◽

Strength Capacity ◽

Floor Systems ◽

The Web

The composite opened web steel joist supported floor systems have been common for many years. It is economic and has light weight and can embed the electrical conduit, ductwork and piping, eliminating the need for these to pass under the member, consequently eliminate the height between floors. In order to study the joist strength capacity under the various conditions, it had been fabricated seven joists composed of the steel and concrete slab connected to the top chord by shear connectors (headed studs). These joist have 2820 mm length c/c of the supports and 235 mm overall depth. In the present study, six variable parameters are adopted (Studs distribution, Degree of shear connection, Degree of the web inclination, Shape of the web, Density of concrete for slab and length of the shear connector). The test results exhibited that minimum strength capacity was 160kN for light weight joist and maximum capacity was 225kN for joist of long shear connectors at failure. The results were compared by ultimate flexural model by Azmi.

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Flexural Behavior of Concrete Composite Beams with New Steel Tube Section and Different Shear Connectors

Tikrit Journal of Engineering Sciences ◽

10.25130/tjes.26.1.07 ◽

2019 ◽

Vol 26 (1) ◽

pp. 51-61

Author(s):

Amer M. Ibrahim ◽

Wissam D. Salman ◽

Fahad M. Bahlol

Keyword(s):

Ultimate Load ◽

Composite Beams ◽

Steel Tube ◽

Flexural Behavior ◽

Shear Connector ◽

Steel Tubes ◽

Shear Connectors ◽

Tube Section ◽

Headed Stud ◽

Steel Section

Steel hollow sections used widely in many engineering applications as structural members. This paper aims to present a study about the flexural behavior of composite beams with steel tubes sections through a series of bending tests in order to study and examine the influence of using different shapes of steel tube section (square, rectangular and hexagonal) with the same shear connector type (headed stud or angle or perfobond) on the flexural behavior and the bending properties of these sections. As well as study the effect of using different shear connectors types (headed stud, angle and perfobond) in the same steel tube section (hexagonal or square or rectangular) on the flexural behavior of composite beams. The experimental program divided into two groups, the first consists of testing nine specimens which focusing on testing three types of steel section when using shear stud at first, angle at second, perfobond at third as shear connector type. Second group consists of testing nine specimens of composite beams too, this group focusing on testing every steel section (hexagonal or square or rectangular) alone when using three types of shear connectors with it. All specimens are with length, width and height equal to 2000, 400 and 130 mm respectively. The tested steel tubes have thickness of 2 mm, yield stress of 322 MPa and the ultimate strength of 390 MPa. The results showed that these shapes of hollow steel sections (hexagonal, square and rectangular) sustain the quality of services for the buildings, and these tested specimens are applicable by giving a distinctive strength and stiffness starting from 114 kN as ultimate load reaching to 170 kN. The experimental results proved that the perfobond and angle connector types are clearly effective shear connectors, shear connector of perfobond type increased the ultimate load of composite beams by (6.25-9.74) % compared with stud shear connector.

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