Axial Behavior of Concrete-Filled Double Skin Steel Tubular Stub Columns Filled with Demolished Concrete Lump

To analyze the axial compression bearing capacity of concrete filled double skin steel tubular (CFDST) stub columns which are filled with demolished concrete lump, twelve stub columns are tested. The main experimental parameters were the diameter-to-thickness ratio, mixing ratio and hollow section ration.Load-displacement curves and failure mode were analyzed, the compressive capacity determined from related design rules were compared with the peak load obtained in the tests. All specimens have a good performance of ductility and late bearing capacity. When the width-thickness is 72 and have a same mixing ratio, CFDST have the same bearing capacity with CFT. When the mixing ratio is 0 and width-thickness is 120, the bearing capacity of CFDST increase 16% than CFT. When the new concrete have similar compressive strength with old and mixing ratio is 25%, the bearing capacity of CFDST increase 18.8% than CFT.

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Axial Behavior of Concrete-Filled Double-Skin Tubular Stub Columns Incorporating PVC Pipes

Crystals ◽

10.3390/cryst11121434 ◽

2021 ◽

Vol 11 (12) ◽

pp. 1434

Author(s):

Muhammmad Faisal Javed ◽

Haris Rafiq ◽

Mohsin Ali Khan ◽

Fahid Aslam ◽

Muhammad Ali Musarat ◽

...

Keyword(s):

Steel Tube ◽

Tube Material ◽

Steel Tubes ◽

Tubular Columns ◽

Axial Capacity ◽

Double Skin ◽

Axial Behavior ◽

Pvc Pipe ◽

The Cost ◽

Stub Columns

This experimental study presents concrete-filled double-skin tubular columns and demonstrates their expected advantages. These columns consist of an outer steel tube, an inner steel tube, and concrete sandwiched between two tubes. The influence of the outer-to-inner tube dimension ratio, outer tube to thickness ratio, and type of inner tube material (steel, PVC pipe) on the ultimate axial capacity of concrete-filled double-skin tubular columns is studied. It is found that the yield strength of the inner tube does not significantly affect the ultimate axial capacity of concrete-filled double-skin tubular composites. With the replacement of the inner tube of steel with a PVC pipe, on average, less than 10% strength is reduced, irrespective of size and dimensions of the steel tube. Hence, the cost of a project can be reduced by replacing inner steel tubes with a PVC pipes. Finally, the experimental results are compared with the existing design methods presented in AISC 360-16 (2016), GB51367 (2019), and EC4 (2004). It is found from the comparison that GB51367 (2019) gives better results, followed by AISC (2016) and EC4 (2004).

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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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Experiments on the bearing capacity of tapered concrete filled double skin steel tubular (CFDST) stub columns

Steel and Composite Structures ◽

10.12989/scs.2014.17.5.667 ◽

2014 ◽

Vol 17 (5) ◽

pp. 667-686 ◽

Cited By ~ 6

Author(s):

Qing-Xin Ren ◽

Chao Hou ◽

Dennis Lam ◽

Lin-Hai Han

Keyword(s):

Bearing Capacity ◽

Double Skin ◽

Stub Columns

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Concrete-filled double-skin aluminum circular hollow section stub columns

Thin-Walled Structures ◽

10.1016/j.tws.2018.09.037 ◽

2018 ◽

Vol 133 ◽

pp. 141-152 ◽

Cited By ~ 5

Author(s):

Feng Zhou ◽

Ben Young

Keyword(s):

Hollow Section ◽

Double Skin ◽

Circular Hollow Section ◽

Stub Columns

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Finite Element Analysis for Concrete Filled Double-Skin Steel Tubular Stub Columns

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.690-693.696 ◽

2013 ◽

Vol 690-693 ◽

pp. 696-699 ◽

Cited By ~ 2

Author(s):

Yan Ze Wang ◽

Bai Shou Li

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Variable Parameter ◽

Element Analysis ◽

Hollow Section ◽

Double Skin ◽

Axial Compressive Strength ◽

Load Behavior ◽

Stub Columns ◽

Good Agreement

To realize axial load behavior of CFDST, ANSYS is used to analyze the process from load to destruction that hollow section ratio is the main variable parameter. To explore the validity of finite element analysis software, axial compressive strength is calculated combined with formulas of existing criterions. The results show the finite element results have a good agreement with text values and calculation.

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