Analytical Evaluation of Behavior of Composite Columns Under Axial Load

Cold-formed steel (CFS) is known as slender or class 4 section due to high ratio of web-to-thickness ratio. The compressive strength of this type of section is usually very low as it tends to fail due to distortion and warping before reaching the actual compressive strength. The aim of this study is to determine the ultimate capacity of build-up lipped CFS assembled with ferrocement jacket where web-stiffener is provided as the proposed composite column (CFFCC) is under axial compression load. Nine specimens of composite columns were prepared and tested. The main parameters varied in the CFFCC columns are column height, cold-formed steel thickness and influence of ferrocement jacket and web-stiffener. There are three different heights of the CFFCC composite column namely 2000mm, 3000mm and 4000mm used in this study. All CFFCC columns were tested under axial load where a thick steel plate is used to evenly distribute the applied load. The results show the effect of providing both the ferrocement jacket to increase the confinement effect and the web stiffener to provide sufficient lateral support to the column web. A significant increase in both the strength and the ductility of the specimens under axial loading has been recorded. The strength capacity of CFFCC has been improved by about 178% greater than that of bare steel column. Also it is found that, axial load capacity of CFS-ferrocement jacket composite columns (CFFCC) were increased with the increase in thickness of CFS. The use of web-stiffener has improved the axial load capacity of the column but not that significant.

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Behaviour of reinforced and concrete-encased composite columns subjected to biaxial bending and axial load

Building and Environment ◽

10.1016/j.buildenv.2007.02.010 ◽

2008 ◽

Vol 43 (6) ◽

pp. 1109-1120 ◽

Cited By ~ 38

Author(s):

Cengiz Dundar ◽

Serkan Tokgoz ◽

A. Kamil Tanrikulu ◽

Tarik Baran

Keyword(s):

Axial Load ◽

Biaxial Bending ◽

Composite Columns

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Cyclic Transition Through Combination Resonances of Parametric Laminated Angle-Ply Composite Columns

13th Biennial Conference on Mechanical Vibration and Noise: Vibration Analysis — Analytical and Computational ◽

10.1115/detc1991-0330 ◽

1991 ◽

Author(s):

R. M. Evan-lwanowski ◽

Hong-Yu Jia ◽

Chu-Ho Lu

Keyword(s):

Asymptotic Method ◽

Axial Load ◽

Degrees Of Freedom ◽

Cyclic Transition ◽

Composite Columns ◽

Geometrical Nonlinearities ◽

Stationary Conditions ◽

Temporal Modes ◽

Three Degrees Of Freedom

Abstract Cyclic transitions through combination resonances of a laminated angle-ply, three-degrees-of-freedom column subjected to a parametric (periodic axial) load have been studied using the asymptotic method. The study included the effects of the coupling stiffnesses, fiber orientations, ply-angles, geometrical nonlinearities, load eccentricities, initial (stationary) conditions, types of the temporal modes.

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Effects of steel-to-member depth ratio and axial load on flexural ductility of concrete-encased steel composite columns

Engineering Structures ◽

10.1016/j.engstruct.2017.11.036 ◽

2018 ◽

Vol 155 ◽

pp. 157-166 ◽

Cited By ~ 5

Author(s):

Cheng-Cheng Chen ◽

Chien-Chung Chen ◽

Jia-Hau Shen

Keyword(s):

Axial Load ◽

Composite Columns ◽

Depth Ratio ◽

Flexural Ductility ◽

Steel Composite

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Nonlinear Finite Element Analysis of the Bearing Capacity of a New Type of Column under Axial Load

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.255-260.45 ◽

2011 ◽

Vol 255-260 ◽

pp. 45-48 ◽

Cited By ~ 1

Author(s):

Ya Feng Xu ◽

Xin Zhao ◽

Yi Fu

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Bearing Capacity ◽

Axial Load ◽

Load Capacity ◽

Element Model ◽

Steel Tube ◽

Element Analysis ◽

Composite Columns ◽

Steel Ratio

Based on experimental research, the bearing performance of the new column (steel tube-reinforced concrete composite columns combination strengthened with angle steel and CFRP) has been studied in detail by finite element method. A finite element model is established based on a series of assumption. The load-displacement curves are obtained. The influence of steel ratio and thickness of CFRP layers to the bearing capacity is analyzed too. The result shows that both the steel ratio and the thickness of CFRP layers have great contribution to the axial load capacity. The finite element analysis results and theoretical analysis which are in good agreement show that simulation results are generally right.

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Axial Load Behavior of Rectangular CFT Stub Columns with Binding Bars

Advances in Structural Engineering ◽

10.1260/136943307782417663 ◽

2007 ◽

Vol 10 (5) ◽

pp. 551-565 ◽

Cited By ~ 24

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.

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