Study on effect of confining tube parameters on axial behavior of 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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Axial Behavior of Concrete-Filled Double Skin Steel Tubular Stub Columns Filled with Demolished Concrete Lump

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.556-562.671 ◽

2014 ◽

Vol 556-562 ◽

pp. 671-674

Author(s):

Yan Ze Wang ◽

Bai Shou Li

Keyword(s):

Bearing Capacity ◽

Peak Load ◽

Mixing Ratio ◽

Design Rules ◽

Hollow Section ◽

Experimental Parameters ◽

Double Skin ◽

Axial Behavior ◽

Stub Columns ◽

Related Design

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 Steel Tubular Stub Columns Filled with Demolished Concrete Lump

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.898.407 ◽

2014 ◽

Vol 898 ◽

pp. 407-410 ◽

Cited By ~ 1

Author(s):

Yan Ze Wang ◽

Bai Shou Li

Keyword(s):

Bearing Capacity ◽

Peak Load ◽

Mixing Ratio ◽

Design Rules ◽

Hollow Section ◽

Experimental Parameters ◽

Double Skin ◽

Axial Behavior ◽

Stub Columns ◽

Related Design

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 HIGH-STRENGTH CONCRETE-FILLEDHIGH-STRENGTH SQUARE STEEL TUBULAR STUB COLUMNS

10.18057/ijasc.2021.17.2.6 ◽

2021 ◽

Keyword(s):

High Strength Concrete ◽

High Strength ◽

Strength Concrete ◽

Axial Behavior ◽

Stub Columns

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Experimental and numerical investigations of square concrete-filled double steel tubular stub columns

Advances in Structural Engineering ◽

10.1177/13694332211004111 ◽

2021 ◽

pp. 136943322110041

Author(s):

Junchang Ci ◽

Mizan Ahmed ◽

Hong Jia ◽

Shicai Chen ◽

Daxing Zhou ◽

...

Keyword(s):

Structural Parameters ◽

Concrete Strength ◽

Experimental Program ◽

Compression Tests ◽

Compression Load ◽

Short Columns ◽

Test Parameters ◽

Wide Range ◽

Axial Behavior ◽

Stub Columns

In this paper, the structural behavior of concrete-filled double steel tubular (CFDST) stub columns composed of square hollow sections is investigated experimentally and numerically. The experimental program comprises compression tests on short columns loaded concentrically. The test parameters mainly focused on the influences of the width-to-thickness ratios of steel tubes and concrete strength on the axial behavior of CFDST stub columns. Finite element (FE) models are also developed to investigate the influences of a wide range of structural parameters on their axial performance. It is observed that square CFDST columns have improved strength and ductility compared to their CFST and DCFST counterparts. Finally, a calculation formula is proposed to predict their ultimate compressive strengths under the axial compression load.

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