Behaviour of Concrete-Filled Double-Skin Circular Hollow Section Cross Joints Under Axial Compression

2018 ◽  
Vol 18 (3) ◽  
pp. 750-772 ◽  
Author(s):  
Yu Chen ◽  
Ran Feng
Keyword(s):  
Axial Compression ◽  
Hollow Section ◽  
Double Skin ◽  
Circular Hollow Section

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.

Behavior of thin-walled circular hollow section stub columns under axial compression

2016 ◽  
Vol 16 (3) ◽  
pp. 777-787 ◽  
Author(s):  
Lanhui Guo ◽  
Yong Liu ◽  
Hui Jiao ◽  
Shilong An
Keyword(s):  
Axial Compression ◽  
Hollow Section ◽  
Thin Walled ◽  
Circular Hollow Section ◽  
Stub Columns

Capacity Difference of Circular Hollow Section X-joints Under Brace Axial Compression and Tension

2020 ◽  
Vol 20 (5) ◽  
pp. 1443-1453
Author(s):  
Bida Zhao ◽  
Chengqing Liu ◽  
Zeyang Yao ◽  
Yangzheng Cai
Keyword(s):  
Axial Compression ◽  
Hollow Section ◽  
Circular Hollow Section

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 Stress Concentration Factors (SCFs) in Circular Hollow Section CHS-to-H-shaped Section Welded T-Joints under Axial Compression

2019 ◽  
Vol 5 (1) ◽  
pp. 33 ◽  
Author(s):  
Abderlahman Ismaeel Hamdan
Keyword(s):  
Stress Concentration ◽  
Axial Compression ◽  
Welded Joints ◽  
Thickness Ratio ◽  
Geometrical Parameters ◽  
Hollow Section ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
Circular Hollow Section ◽  
Shaped Section

The aim of this paper is to investigate the effects of non-dimensional geometric parameters on stress concentration factors (SCFs) of circular hollow section CHS brace-to-H-shaped section T-connections under axial compression. This type of welded joints is used increasingly in steel construction. However, its fatigue design is not covered by codes, and its fatigue strength has not been given the deserved attention by researchers.  This research, however, bridges the gab on SCFs in this type of welded connections when being loaded in axial compression. here, parametric study based on the numerical analysis was performed to evaluate the effect of CHS brace diameter to H-shaped chord flange width ratio (β), H-shaped chord flange width to thickness ratio (2γ) and CHS brace thickness to H-shaped chord flange thickness ratio (τ) on SCFs in the brace and the chord of the connection. Based on practical considerations, the validity range of these parameters was 0.3 ≤ β ≤ 0.7, 16 ≤ 2γ ≤ 30 and 0.2 ≤ τ ≤ 0.1. Three-dimensional finite element (FE) study using commercial software ABAQUS was performed to study the hot spot stress distribution and hence SCFs in this type of welded joints. To begin with, the results of FEM were verified against available experimental data and good agreement was achieved. Afterwards, 48 joints were modeled in Abaqus to study the effect of geometrical parameter on SCFs in brace and chord. Based on the results of this extensive study, the effect of geometrical parameters was revealed. The paper, thus, shows that whilst β increases, SCFs in the brace and chord increases. Moreover, increasing the parameter 2γ results in an increase in SCFs in the two members. However, the change in τ has no significant effect on the SCFs in the brace or the chord. Values of SCFs are found to be between 2 and 7.

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