scholarly journals Axial behaviour of concrete filled steel tube stub columns: a review

2018 ◽  
Author(s):  
Soner Güler ◽  
Fuat Korkut ◽  
Namik Yaltay ◽  
Demet Yavuz
Keyword(s):  
Cross Section ◽  
Axial Load ◽  
Load Capacity ◽  
Local Buckling ◽  
Bending Moment ◽  
Steel Tube ◽  
High Rise ◽  
Axial Load Capacity ◽  
The Cross ◽  
Cfst Columns

Concrete-filled steel tubular (CFST) columns are widely used in construction of high-rise buildings and peers of bridges to increase the lateral stiffness of the buildings, the axial load capacity, ductility, toughness, and resistance of corrosion of the columns. The CFST columns have much superior characteristics compared with traditionally reinforced concrete columns. The position of the concrete and steel tube in the cross-section of the CFST column is the most appropriate solution in terms of the strength and ductility. The steel tube, which is placed outside of the cross-section of the column, withstand the bending moment effectively. The concrete that is placed into the steel tube delay the local buckling of the steel tube and increase the axial load capacity of the column due to continually lateral confining. This paper presents a review on experimental results of the axial behavior of CFST columns performed by various researchers.

scholarly journals The Ovalisation of Steel Circular Hollow Sections under Bending

2018 ◽  
Vol 11 (1) ◽  
Author(s):  
Manahel Sh. Khalaf ◽  
Amer M. Ibrahim
Keyword(s):  
Cross Section ◽  
Local Buckling ◽  
Bending Moment ◽  
Thickness Ratio ◽  
Experimental Results ◽  
Experimental Program ◽  
Specimen Length ◽  
Specimen Cross Section ◽  
The Cross

This paper investigates the ovalisation behavior of the Steel Circular Hollow Sections (CHSs) when subjected to bending moment. The experimental program included testing of ten specimens in four groups in order to examine the influence of changing the diameter, thickness, length and the presence of openings on the ovalisation phenomenon of these specimens.The experimental results showed that the ovalisation of the specimen cross-section appears clearly when the diameter to thickness ratio (D/t) is ranging from 17 to 50, while the ovalisation of the specimens that have D/t ratio greater than 50 is very little or unclear because the instability of these specimens are controlled by the local buckling. In addition, the change of the specimen length and the presence of openings didn’t cause the cross-section ovalisation

EXPERIMENTAL ASSESSMENT OF CONCENTRICALLY LOADED PRE-STRESSING CONCRETE-FILLED STEEL TUBULAR COLUMNS

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Aman Mwafy ◽  
Amr El-Dieb ◽  
Abdulaziz Lazkani
Keyword(s):  
Compressive Strength ◽  
Axial Load ◽  
Load Capacity ◽  
Concrete Compressive Strength ◽  
Tubular Columns ◽  
Modes Of Failure ◽  
Axial Load Capacity ◽  
Load Tests ◽  
Expansive Additive ◽  
Cfst Columns

Although expansive additives are frequently used in contemporary concrete-filled steel tubular (CFST) structures to improve the bond between concrete and steel tubes, little information is available regarding their influence on the mechanical characteristics of CFST columns. This reflects the pressing need to investigate the impacts of the pre-stressing achieved through the expansive additives, especially on the concrete confinement and axial load capacity of CFST. This paper thus discusses the results of concentric load tests carried out for 12 pre-stressing CFST columns to assess their axial load capacity and modes of failure. The main parameters investigated are the concrete compressive strength (40, 50 and 90 MPa) and the dosage of the expansive agent (0%, 6%, 12% and 24% by mass of cement). The results indicate that the axial load capacity is improved by increasing both the concrete compressive strength and the expansive additive dosage. The expansive additive has an important influence on the confinement effect of CFST. The paper presents new test results that contribute to fill a gap in the literature and provides insights into the behavior of concentrically loaded pre-stressing CFST columns.

Monitoring for Large Cross-Section CFSTs of a Super High-Rise Building with Piezoceramic Actuators and Sensors

2010 ◽  
Vol 163-167 ◽  
pp. 2553-2559 ◽  
Author(s):  
Qing Huang ◽  
Bin Xu ◽  
Bing Li ◽  
Gang Bing Song ◽  
Jun Teng
Keyword(s):  
Cross Section ◽  
Lead Zirconate Titanate ◽  
Good Condition ◽  
Steel Tube ◽  
Large Cross Section ◽  
Engineering Structures ◽  
High Rise ◽  
High Rise Building ◽  
Bonding Performance ◽  
Cfst Columns

As a typical composite structural type, concrete-Filled Steel Tubes (CFSTs) have been widely employed in civil engineering structures, especially in super high-rise buildings because of their enhanced load-carrying capacity and ductility. The uniformity and quality of the on-site cast concrete within the tube and the interface bonding performance between the steel tube and the concrete have received extensive attention. In this paper, Piezoelectric ceramic materials, such as Lead Zirconate Titanate (PZT) and a kind of functional smart aggregate (SA) based on PZT together are employed to evaluate the concrete quality and the bonding performance of CFST columns of a super high-rise building with a design height over 400 meters and with large cross-section CFST columns. Based on the wavelet packet analysis on the measurements of the PZT sensors, results show that no obvious damage and defect is detected and the concrete qualify and the interface of large cross-section CFST columns of this super high-rise building are in good condition. The proposed monitoring technology has great potential to be applied to practical engineering.

Study on Predicting Axial Load Capacity of CFST Columns

2017 ◽  
Vol 99 (1) ◽  
pp. 133-140 ◽  
Author(s):  
H. Ravi Kumar ◽  
K. U. Muthu ◽  
N. S. Kumar
Keyword(s):  
Axial Load ◽  
Load Capacity ◽  
Axial Load Capacity ◽  
Cfst Columns

Post-Fire Performance of Square Concrete-Filled Steel Tube Columns under Uni-Axial Load

2021 ◽  
Vol 1016 ◽  
pp. 618-623
Author(s):  
Jaksada Thumrongvut ◽  
Apichat Tipcharoen ◽  
Kamonwan Prathumwong
Keyword(s):  
Ambient Temperature ◽  
Axial Load ◽  
Elevated Temperatures ◽  
Load Capacity ◽  
Steel Tube ◽  
Fire Performance ◽  
Concrete Filled Steel Tube ◽  
Axial Load Capacity ◽  
Comparison Results ◽  
Axial Shortening

This paper presents experimental studies on the post-fire performance of concrete-filled steel tube (CSFT) columns under uni-axial load. The structural responses and axial load capacity of CSFT columns after exposure to elevated temperatures are investigated and discussed. All of the specimens are 750 mm in height, the nominal cross-section of the specimen is 150 mm x 150 mm, and have cylinder compressive strength of 18 MPa. The primary test parameters to be measured during the uni-axial compression test are wall thicknesses of the square tube (3.0 mm, 4.5 mm and 6.0 mm) and three different exposure to elevated temperatures (400°C, 600°C and 800°C). The results showed that the load-axial shortening relationship of the CSFT columns have a linear elastic response up to 80-90% of axial load capacity. After the axial load capacity is reached, the load-axial shortening curves are rarely becoming a nonlinear manner. It is also shown that the axial load capacity and ductility of the post-fire test columns are decreased significantly compared to the columns at ambient temperature, depending mainly on the elevated temperature. In addition, by comparing the axial load capacity of the test results with those obtained from the ACI design equation, the comparison results indicate that calculation formula in ACI code unconservative predicts the axial load capacity of the CSFT columns after exposure to elevated temperatures. Finally, the residual strength ratios are modified to both strength of concrete and steel tube under ambient temperature, and analyzed to evaluate the effect of post-fire behavior on the axial capacity of CFST columns.

Analytical Simulation of Axial Behavior of RCFT Wall

2013 ◽  
Vol 284-287 ◽  
pp. 1220-1224
Author(s):  
Ji Ho Moon ◽  
Dawn E. Lehman ◽  
Hee Jung Ko ◽  
Hak Eun Lee
Keyword(s):  
Aspect Ratio ◽  
Load Capacity ◽  
Local Buckling ◽  
Steel Tube ◽  
Bridge Piers ◽  
Concrete Filled Tubes ◽  
Rapid Construction ◽  
Analytical Simulation ◽  
Axial Load Capacity ◽  
Axial Behavior

Rectangular concrete-filled tubes (RCFTs) have been widely used as columns of building and bridge piers due to several advantages such as their strength-to-size efficiency and facilitation of rapid construction. Recently, some researchers have tried to use RCFT as a wall system in a building. RCFT wall have a high aspect ratio while the aspect ratio of the RCFT column is usually one. Thus, the behavior of the RCFT wall is clearly different from that of RCFT column and it needs to be investigated. In this study, the axial behavior of the RCFT wall was investigated through analytical simulation, and the effects of the aspect ratio, internal stud, and through rebar on axial behavior of the RCFT wall were examined. From the results, it was found that axial load capacity is decreased with increasing aspect ratio due to local buckling of the steel tube, and this local buckling can be efficiently prevented by using internal through rebar.

Axial load-capacity of rectangular cement stabilized rammed earth column

2015 ◽  
Vol 99 ◽  
pp. 402-412 ◽  
Author(s):  
Deb Dulal Tripura ◽  
Konjengbam Darunkumar Singh
Keyword(s):  
Axial Load ◽  
Load Capacity ◽  
Rammed Earth ◽  
Axial Load Capacity

Axial load capacity of cylindrical shells with local geometric defects

1991 ◽  
Vol 31 (2) ◽  
pp. 104-110 ◽  
Author(s):  
S. Krishnakumar ◽  
C. G. Foster
Keyword(s):  
Axial Load ◽  
Load Capacity ◽  
Cylindrical Shells ◽  
Axial Load Capacity
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