Compressive strengths of concrete-filled double-skin (circular hollow section outer and square hollow section inner) aluminium tubular sections

2019 ◽  
Vol 22 (11) ◽  
pp. 2418-2434 ◽  
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.

scholarly journals Ultimate Axial Strength of Concrete-Filled Double Skin Steel Tubular Column Sections

2019 ◽  
Vol 2019 ◽  
pp. 1-19 ◽  
Author(s):  
S. İpek ◽  
E. M. Güneyisi
Keyword(s):  
Gene Expression Programming ◽  
Estimation Error ◽  
Axial Loading ◽  
Steel Tubes ◽  
Hollow Section ◽  
Composite Columns ◽  
Axial Strength ◽  
Proposed Model ◽  
Double Skin ◽  
Circular Hollow Section

This study aims at proposing a new model for evaluating the ultimate axial strength of concrete-filled double skin steel tubular (CFDST) composite columns. For this, a total of 103 experimental data regarding the ultimate strength of CFDST columns under axial loading were collected from the previous studies in the literature. All CFDST columns consist of two steel tubes being outer and inner circular hollow section. The model presented herein was developed by using gene expression programming. For this, the yield strength, diameter, and thickness of both outer and inner steel tubes, the compressive strength of annulus concrete, the length of the specimen, and the ultimate axial strength of the columns were utilized as the parameters. Assessment of the obtained results indicated that the generated model had a good performance compared to the existing models by the previous researchers and the equations specified in the design codes. The high value of R2 and narrow ranged fluctuation of the estimation error for the ultimate axial strength of the CFDST columns were also achieved through the proposed model.

scholarly journals Comparative Study of CFRP-Confined CFST Stub Columns under Axial Compression

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Ying Guo ◽  
Yufen Zhang
Keyword(s):  
Comparative Study ◽  
Bearing Capacity ◽  
Limit Equilibrium ◽  
Concrete Strength ◽  
Confinement Effect ◽  
Unified Theory ◽  
Enhancement Ratio ◽  
Composite Columns ◽  
Cfst Columns ◽  
Stub Columns

This paper presented a comparative study of concrete-filled steel tubular (CFST) stub columns with three different confinement types from carbon fiber reinforced polymer (CFRP): outer circular CFRP, inner circular CFRP, and outer square CFRP. The compressive mechanism and physical properties of the composite column were analyzed firstly aiming at investigating the confinement effect of CFRP. Ultimate axial bearing capacity of these three CFRP-confined CFST columns was calculated based on Unified Theory of CFST and elastoplastic limit equilibrium theory, respectively. Meanwhile, the corresponding tests are adopted to validate the feasibility of the two calculation models. Through data analysis, the study confirmed the ultimate strength calculation results of the limit equilibrium method were found to be more reliable and approximate to the test results than those of Unified Theory of CFST. Then axial bearing capacity of the pure CFST column was predicted to evaluate the bearing capacity enhancement ratio of the three types of composite columns. It was demonstrated that the averaged enhancement ratio is 16.4 percent, showing that CFRP-confined CFST columns had a broad engineering applicability. Through a comparative analysis, this study also confirmed that outer circular CFRP had the best confinement effect and outer square CFRP did better than inner circular CFRP. The confinement effect of CFRP increased with the decrease of concrete strength, and it was proportional with relative proportions of CFRP and steel under the same concrete strength.

scholarly journals Pull-out Behaviour of Extended Hollobolts for Hollow Beam-Column Connections

2018 ◽  
Author(s):  
Mohd Fazaulnizam Bin Shamsudin ◽  
Walid Tizani
Keyword(s):  
Concrete Strength ◽  
Weight Ratio ◽  
High Strength ◽  
Element Model ◽  
Embedment Depth ◽  
Gusset Plates ◽  
Hollow Section ◽  
Hollow Beam ◽  
Pull Out ◽  
Joint Behaviour

The use of structural hollow sections (SHS) as columns in single-storey and multi-storey results in better compression strength, low surface area, architectural attractiveness and high strength to weight ratio. One major constraint when connecting to hollow sections is in accessing and tightening the bolt from the inside of the hollow section. To resolve this issue, full welding is usually applied. But this may suffer from high labour cost, and the potential of low quality welding due to workmanship and varied environmental conditions. Connecting using additional components, such as gusset plates and brackets, helps to ease this problem but lowers aesthetic appeal. To avoid the need to access to the inner face of the column section, new type of fasteners known as blind bolts were introduced. In this paper, experimental and numerical studies were conducted using a new anchored blind bolt known as the Extended HolloBolt (EHB), with the objective of using the component method for predicting joint behaviour within the tensile region. The behaviour of EHB in a group with different connection topologies and configurations was investigated using a total of 36 tests with one row of M16 Grade 8.8 and 10.9 bolts subjected to pull-out loading in tension. The experimental work covers a range of parameters such as bolt gauge, concrete strength, concrete type, bolt embedment depth and bolt class. A finite element model was implemented with good agreement between experimental and simulated load-deflection results, which have a maximum difference of 2.5%, shows that the model is suitable to be used for parametric studies or analytical work in further research on the EHB.

scholarly journals Experimental analysis of a mechanical shear connector in concrete filled steel tube column

2017 ◽  
Vol 10 (3) ◽  
pp. 592-625
Author(s):  
J. G. R. NETO ◽  
A. M. SARMANHO
Keyword(s):  
Steel Tube ◽  
Outer Diameter ◽  
Shear Connector ◽  
Hollow Section ◽  
Composite Columns ◽  
Shear Connectors ◽  
Strength Capacity ◽  
Hole Dimension ◽  
Circular Hollow Section ◽  
Bolt Diameter

ABSTRACT This work includes an analytical and experimental study of the structural behavior of shear connectors in composite columns, composed of concrete-filled circular hollow section. For this study was adopted a structural bolt like a shear connector in order to verify the validity of the analytical expressions in ABNT NBR 16239: 2014 [1]. Was carried out a series of push-out tests, fixing the outer diameter of the hollow section and varying the thickness, the bolt diameter, the strength of concrete and the hole dimension. Analysis of the results shows that is possible to use this type of shear connector. The Brazilian prescriptions results are conservative and may be adjusted to provide strength capacity value closest to the experiment.

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

2013 ◽  
Vol 690-693 ◽  
pp. 696-699 ◽  
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.

Compressive strength of girth-welded stainless steel circular hollow section members: Stub columns

2014 ◽  
Vol 92 ◽  
pp. 15-24 ◽  
Author(s):  
Chin-Hyung Lee ◽  
Kyong-Ho Chang ◽  
Ki-Tae Park ◽  
Hyun-Seop Shin ◽  
Moonseok Lee
Keyword(s):  
Stainless Steel ◽  
Compressive Strength ◽  
Hollow Section ◽  
Circular Hollow Section ◽  
Stub Columns

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

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.

Sign in / Sign up

Export Citation Format

Share Document