Axial strength and ductility of square composite columns with two interlocking spirals

2013 ◽  
Vol 90 ◽  
pp. 184-192 ◽  
Author(s):  
Tsu-Han Shih ◽  
Cheng-Chih Chen ◽  
Cheng-Chiang Weng ◽  
Samuel Yen-Liang Yin ◽  
Jui-Chen Wang
Keyword(s):  
Composite Columns ◽  
Axial Strength ◽  
Interlocking Spirals ◽  
Strength And Ductility

Experimental Study of Post-Fire Performance of Ceramsite Concrete Filled Steel Tabular Columns

2011 ◽  
Vol 71-78 ◽  
pp. 3733-3736 ◽  
Author(s):  
Xin Tang Wang ◽  
Jie Yin ◽  
Ming Zhou ◽  
Jian Min Wang
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
Geometrical Parameters ◽  
Test Results ◽  
Fire Performance ◽  
Fire Response ◽  
Composite Columns ◽  
Short Columns ◽  
Maximum Value ◽  
Strength And Ductility

The post-fire performance of a set of ceramsite concrete filled steel tabular short columns (noted as CCSSC) after exposure to fire are experimentally studied. Effect of the maximum value of fire response temperatures and geometrical parameters of the composite columns on the strength and ductility of the specimens were especially discussed. The test results show that the specimens of CCSSC have higher post-fire bearing capacity and better ductility, and both of maximum response temperature and geometrical parameters of the specimens presented here have great effect on the post-fire bearing capacity and ductility of ceramsite concrete-filled steel short columns after exposure to fire.

Axial Load Behavior of Rectangular CFT Stub Columns with Binding Bars

2007 ◽  
Vol 10 (5) ◽  
pp. 551-565 ◽  
Author(s):  
Jian Cai ◽  
Yue-Ling Long
Keyword(s):  
Ultimate Strength ◽  
Axial Load ◽  
Local Buckling ◽  
Concrete Core ◽  
Cross Sectional ◽  
Composite Columns ◽  
Proposed Model ◽  
Load Behavior ◽  
Stub Columns ◽  
Strength And Ductility

This paper presents an experimental study on the axial load behaviour of rectangular concrete-filled steel tubular (R-CFT) stub columns with binding bars. Eight specimens were concentrically loaded in compression to failure in order to investigate the effects of the binding bars, depth-to-wall thickness ratio and cross-sectional aspect ratio on the ultimate strength and ductility of the composite columns. Experimental results indicate that the binding bars increase the confinement of the concrete core and delay local buckling of the tube. The results also show that R-CFT columns with binding bars have better ductility than those without binding bars. A model is proposed to predict the ultimate strength of the specimens. A comparison of the ultimate strengths between tests and design codes shows that the proposed model gives reasonable predictions of the ultimate strength of rectangular CFT stub columns with binding bars while the codes EC4 (1996), AIJ (1997) and GJB (2001) conservatively estimate the ultimate strength by 17.6%, 22.9% and 9.7% respectively.

Behaviour and Strength of Innovative Steel Concrete Columns with SCC

2014 ◽  
Vol 984-985 ◽  
pp. 684-692 ◽  
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.

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

2019 ◽  
Vol 2019 ◽  
pp. 1-19 ◽  
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.

scholarly journals Comparison of ultimate strength results from ACI and Eurocode 4 for steel tubular columns filled with SCC

2018 ◽  
Vol 162 ◽  
pp. 04002
Author(s):  
Asraa Al-Goody ◽  
Esra Mete Güneyisi ◽  
Süleyman İpek
Keyword(s):  
American Concrete Institute ◽  
Steel Tube ◽  
Steel Tubes ◽  
Composite Columns ◽  
Axial Strength ◽  
Tubular Columns ◽  
Circular Steel Tube ◽  
Structural Applications ◽  
Cfst Columns ◽  
Infill Material

The Concrete Filled Steel Tubular (CFST) columns have several benefits in comparison to the ordinary steel or reinforced concrete ones. Therefore, they have become more commonly acknowledged in the structural applications. In this study, two design codes such as American Concrete Institute (ACI) and Eurocode 4 (EC4) were used for predicting the ultimate axial strength of CFST columns filled with self-compacting concrete (SCC). To evaluate the results, circular steel tube with different diameter to thickness (D/t) ratio of 30, 60, and 90 and steel yielding strength of 185, 275, and 450 MPa were considered as prediction parameters. The wall thickness and length to diameter (L/D) ratio of the steel tubes were kept constant. As an infill material for the steel tubes, 16 different SCC mixtures reported in the literature were studied and their compressive strength results were used to get the code predicted ultimate axial strength of the composite columns. The analysis of the results based on ACI and EC4 were performed and discussed comparatively.

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