scholarly journals Comparison of the predictability of the ultimate axial strength of elliptical CFST columns using existing square and circular section-based code formulae

2021 ◽  
Author(s):  
Süleyman İPEK ◽  
Esra Mete GÜNEYİSİ
Keyword(s):  
Circular Section ◽  
Axial Strength ◽  
Cfst Columns

scholarly journals Investigation of the effect of impact load on concrete-filled steel tube columns under fire

2020 ◽  
Vol 14 (54) ◽  
pp. 317-324
Author(s):  
Ali Golsoorat Pahlaviani ◽  
Ali Mohammad Rousta ◽  
Peyman Beiranvand
Keyword(s):  
Impact Load ◽  
High Strength ◽  
Concrete Columns ◽  
Steel Tube ◽  
Lateral Impact ◽  
Concrete Filled Steel Tube ◽  
Axial Strength ◽  
High Rise ◽  
Working Space ◽  
Cfst Columns

Concrete-filled steel tube (CFST) columns are increasingly used in the construction of high-rise buildings which require high strength and large working space especially at lower stories. As compared to reinforced concrete columns, existence of the exterior steel tube not only bears a portion of axial load but also most importantly provides confinement to the infill concrete.with the confinement provided by the steel tube, axial strength of the infill concrete can be largely enhanced.this paper presents the investigation effect of impact load on concrete-filled steel tube columns under fire by numerical simulations using ABAQUS software.the results indicate that the CFST sections with larger confinement factor ξ=1.23 behaved in a very ductile manner under lateral impact. And the sections with smaller confinement factor ξ=0.44  generally behaved in a brittle mechanism.

scholarly journals Axial load behaviour of steel tube columns in-filled with various high performance concretes

2021 ◽  
Author(s):  
Katie Chu
Keyword(s):  
Axial Load ◽  
High Performance ◽  
Failure Modes ◽  
Lightweight Concrete ◽  
High Strength ◽  
Crumb Rubber ◽  
Steel Tube ◽  
Axial Strength ◽  
Coarse Aggregates ◽  
Cfst Columns

This research concentrates on the axial load behaviour of circular, square and rectangular concrete filled steel tube (CFST) columns incorporating high-performance self-consolidating concretes such as ultra-high strength concrete (UHSC), engineered cementitious composite (ECC), lightweight concrete (LWC), and crumb rubber concrete (CRC). Seventy-four CFST specimens with varying slenderness, shape, concrete type and presence of internal bar reinforcements are tested experimentally under axial compression loading. The effect of these variables on axial load-deformation response, strain characteristics, failure modes, concrete confinement and axial strength are evaluated through experimental results. Performance of existing analytical/code based models for axial strength and concrete confined strength is evaluated. Concretes without coarse aggregates including UHSC proved less effective at enhancing axial strength of filled tube columns through confinement. In contrast, confinement in filled steel tube columns was found most effective with the use of concretes with coarse aggregates such as LWC and CRC.

scholarly journals Study on Axial Compressive Capacity of FRP-Confined Concrete-Filled Steel Tubes and Its Comparisons with Other Composite Structural Systems

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Jun Deng ◽  
Yifeng Zheng ◽  
Yi Wang ◽  
Tonghua Liu ◽  
Hui Li
Keyword(s):  
Basalt Fiber ◽  
Fiber Reinforced Polymer ◽  
Structural Systems ◽  
Fiber Reinforced ◽  
Steel Tubes ◽  
Axial Strength ◽  
Cfrp Sheets ◽  
Existing Structures ◽  
Reinforced Polymer ◽  
Cfst Columns

Concrete-filled steel tubular (CFST) columns have been widely used for constructions in recent decades because of their high axial strength. In CFSTs, however, steel tubes are susceptible to degradation due to corrosion, which results in the decrease of axial strength of CFSTs. To further improve the axial strength of CFST columns, carbon fiber reinforced polymer (CFRP) sheets and basalt fiber reinforced polymer (BFRP) sheets are applied to warp the CFSTs. This paper presents an experimental study on the axial compressive capacity of CFRP-confined CFSTs and BFRP-confined CFSTs, which verified the analytical model with considering the effect of concrete self-stressing. CFSTs wrapped with FRP exhibited a higher ductile behavior. Wrapping with CFRP and BFRP improves the axial compressive capacity of CFSTs by 61.4% and 17.7%, respectively. Compared with the previous composite structural systems of concrete-filled FRP tubes (CFFTs) and double-skin tubular columns (DSTCs), FRP-confined CFSTs were convenient in reinforcing existing structures because of softness of the FRP sheets. Moreover, axial compressive capacity of CFSTs wrapped with CFRP sheets was higher than CFFTs and DSTCs, while the compressive strength of DSTCs was higher than the retrofitted CFSTs.

scholarly journals Effects of Concentrical Partial (Local) Compression on the Structural Behavior of Concrete Filled Steel Tubular Column

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
S. Jayaganesh ◽  
J. Raja Murugadoss ◽  
G. Ganesh Prabhu ◽  
J. Jegan
Keyword(s):  
Compression Ratio ◽  
Local Area ◽  
Structural Behavior ◽  
Structural Performance ◽  
Circular Section ◽  
Experimental Parameters ◽  
Section Type ◽  
Cfst Columns ◽  
Compression Area ◽  
Stub Columns

The objective of this present paper is to investigate the structural behavior of square and circular Concrete Filled Steel Tubular (CFST) stub columns subjected to axial partial/local compression. The experimental parameters were local compression area and section type. Among the twelve specimens, six specimens were tested under full compression and the remaining six specimens were tested under local compression. The experimental observation indicated that the failure pattern of the CFST column with partial compression is fairly different from the CFST column subjected to full compression. The confinement provided by the circular section is quite different than the confinement provided by the square section, when the CFST column is subjected to axially local compression. It was found that the elastic modulus (stiffness) and the ultimate bearing capacity of the CFST column decreased with the increase in local compression ratio. The circular and square CFST columns subjected to partial/local compression achieved an ultimate strength of 4.45% and 14.15%, respectively, less than that of the columns subjected to full compression. From the above observation, it can be inferred that the structural performance of the CFST column is significantly influenced by the local area compression ratio and this effect should be taken into account in design models.

Effect of concrete wet packing density on the uni‐axial strength of manufactured sand CFST columns

2022 ◽  
Author(s):  
Mianheng Lai ◽  
Kaijie Wu ◽  
Xiaoling Ou ◽  
Mengru Zeng ◽  
Chengwei Li ◽  
...  
Keyword(s):  
Packing Density ◽  
Manufactured Sand ◽  
Axial Strength ◽  
Cfst Columns

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.

Practical formula for predicting axial strength of circular-CFST columns considering size effect

2020 ◽  
Vol 168 ◽  
pp. 105979 ◽  
Author(s):  
Chang Yang ◽  
Pan Gao ◽  
Xingxiang Wu ◽  
Y. Frank Chen ◽  
Qi Li ◽  
...  
Keyword(s):  
Size Effect ◽  
Axial Strength ◽  
Cfst Columns

scholarly journals AXIAL STRENGTH OF CFST COLUMNS CONSIDERING CONCRETE AGE

2014 ◽  
pp. 139-150
Author(s):  
Hai-Yang Wang ◽  
◽  
Xiao-Xiong Zha ◽  
Keyword(s):  
Axial Strength ◽  
Cfst Columns

scholarly journals Axial load behaviour of steel tube columns in-filled with various high performance concretes

2021 ◽  
Author(s):  
Katie Chu
Keyword(s):  
Axial Load ◽  
High Performance ◽  
Failure Modes ◽  
Lightweight Concrete ◽  
High Strength ◽  
Crumb Rubber ◽  
Steel Tube ◽  
Axial Strength ◽  
Coarse Aggregates ◽  
Cfst Columns

This research concentrates on the axial load behaviour of circular, square and rectangular concrete filled steel tube (CFST) columns incorporating high-performance self-consolidating concretes such as ultra-high strength concrete (UHSC), engineered cementitious composite (ECC), lightweight concrete (LWC), and crumb rubber concrete (CRC). Seventy-four CFST specimens with varying slenderness, shape, concrete type and presence of internal bar reinforcements are tested experimentally under axial compression loading. The effect of these variables on axial load-deformation response, strain characteristics, failure modes, concrete confinement and axial strength are evaluated through experimental results. Performance of existing analytical/code based models for axial strength and concrete confined strength is evaluated. Concretes without coarse aggregates including UHSC proved less effective at enhancing axial strength of filled tube columns through confinement. In contrast, confinement in filled steel tube columns was found most effective with the use of concretes with coarse aggregates such as LWC and CRC.

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