scholarly journals Numerical Investigation of the Composite Action of Axially Compressed Concrete-Filled Circular Aluminum Alloy Tubular Stub Columns

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2435
Author(s):  
Faxing Ding ◽  
Changbin Liao ◽  
En Wang ◽  
Fei Lyu ◽  
Yunlong Xu ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Constitutive Model ◽  
Axial Compression ◽  
Limit State ◽  
Superposition Method ◽  
Fe Model ◽  
Composite Action ◽  
Analytical Results ◽  
Aluminum Alloy Tube ◽  
Stub Columns

This paper studied the composite action of concrete-filled circular aluminum alloy tubular (CFCAT) stub columns under axial compression. A fine-meshed finite three-dimensional (3D) solid element model making use of a tri-axial plastic-damage constitutive model of concrete and elastoplastic constitutive model of aluminum alloy was established. A parametric study utilizing the verified finite element (FE) model was carried out and the analytical results were exploited to investigate the composite actions of concrete-filled circular aluminum alloy tubular stub columns subjected axial compression. Compared with the concrete-filled steel tube (CFCST) stub columns, the aluminum alloy tube exerted a weaker constraint effect on the infilled concrete due to its lower elastic modulus. Based on the FE analytical results and regression method, the composite action model of concrete-filled circular aluminum alloy tubular stub columns was proposed. By generalizing the stress nephogram of the concrete-filled circular aluminum alloy tubular stub column at the limit state, a design formula was proposed to estimate the ultimate bearing capacity the columns using the superposition method. The predicted results of the proposed formula show a good agreement with both the experimental and FE analytical results. The comparison between the proposed formula and current design methods indicates that the proposed formula is more accurate and convenient to use.

Cold-formed elliptical concrete-filled steel tubular columns subjected to monotonic and cyclic axial compression

2019 ◽  
Vol 23 (7) ◽  
pp. 1383-1396 ◽  
Author(s):  
Youwu Xu ◽  
Jian Yao ◽  
Xin Sun
Keyword(s):  
Axial Compression ◽  
Failure Modes ◽  
Axial Strain ◽  
Residual Deformation ◽  
Steel Tube ◽  
Superposition Method ◽  
Fe Model ◽  
Hoop Strain ◽  
Tubular Columns ◽  
Stub Columns

Concrete-filled steel tubular columns are widely used in structural systems, and elliptical concrete-filled steel tubular columns are receiving more and more attention. An experimental study on cold-formed elliptical concrete-filled steel tubular stub columns was carried out under monotonic and cyclic axial compression. The failure modes, axial load–displacement curves, ultimate loads, hoop strain–axial strain behavior, strength deterioration, and residual deformation were obtained and discussed. Complementary finite element models considering the complex non-uniform confinement between steel tube and concrete were developed and validated by experimental results. Then, the validated FE model was used to study the influence of aspect ratio, yield strength of steel, and compressive strength of concrete on the axial capacity of elliptical concrete-filled steel tubular stub columns. Finally, a relatively simple superposition method was put forward to predict the axial bearing capacity of elliptical concrete-filled steel tubular stub columns. Compared with the test data, both the numerical method and superposition method can generate accurate predictions.

scholarly journals Numerical Investigation of Composite Behavior and Strength of Rectangular Concrete-Filled Cold-Formed Steel Tubular Stub Columns

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6221
Author(s):  
Liping Wang ◽  
Yanan An ◽  
Faxing Ding ◽  
Yachuan Kuang ◽  
Qing Ma ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Concrete Strength ◽  
Limit State ◽  
Element Model ◽  
Theoretical Formula ◽  
Width Ratio ◽  
Superposition Method ◽  
Cold Forming ◽  
Cold Formed Steel ◽  
Stub Columns

The objective of this study was to investigate the composite behavior of rectangular concrete-filled cold-formed steel (CFS) tubular stub columns under axial compression. A fine finite 3D solid element model of rectangular concrete-filled cold-formed steel tubular stub column was established by ABAQUS, which utilized a constitutive model of cold-formed steel considering the cold-forming effect and a triaxial plastic-damage constitutive model of the infilled concrete. Good agreement was achieved and the average discrepancy between the experimental and FE results was less than 5%. Based on the verified models, a further parametric analysis was carried out to reveal the influence of various factors on the strength and behavior of the concrete-filled rectangular cold-formed steel tubular stub columns. The factors included constitutive models adopted for cold-formed steel, length over width ratio of the rectangular section, wall-thickness and width, and concrete strength and yield strength of the cold-formed steel. A total of 144 FE models were analyzed. The stress nephogram was reasonably simplified in accordance with the limit state and a theoretical formula considering confinement coefficient was proposed to estimate the ultimate bearing capacity of concrete-filled rectangular cold-formed steel tubular stub columns using the superposition method. The calculated results showed satisfactory agreement with both the experimental and FE results, which proved the validity and accuracy of the formula proposed in this paper. In the proposed formula, the confinement coefficient of square concrete-filled cold-formed steel tubular stub columns is larger than that of hot-rolled steel counterparts but smaller than that of the stainless steel counterparts.

scholarly journals Analytical behavior of concrete-filled aluminum tubular stub columns under axial compression

2018 ◽  
Author(s):  
Fa-Cheng Wang ◽  
Hua-Yang Zhao ◽  
Lin-Hai Han
Keyword(s):  
Axial Compression ◽  
Failure Modes ◽  
Numerical Models ◽  
Axial Strain ◽  
Fe Model ◽  
Aluminum Tube ◽  
Wide Range ◽  
Parametric Studies ◽  
Analytical Behavior ◽  
Stub Columns

This paper presents numerical investigation of circular concrete-filled aluminum tubular (CFAT) stub columns under axial compression. The numerical models were developed using the finite element (FE) package ABAQUS. The parameters commonly employed in conventional CFST FE modeling have been discussed in this study. The nonlinearities of concrete and aluminum materials and the interaction between concrete and aluminum tube were considered. Numerical models were validated against collected experimental data. The ultimate loads, load-axial strain relationship and failure modes from numerical simulations were compared with those from experiments. The verified FE model was used to analyze structural behavior of full histories of the corresponding load-deformation N-ε response. Load-deformation N-ε curves for both concrete and aluminum tube were also presented. Upon on validation of the FE models, additional structural performance data over a wide range of diameter-to-thickness ratios, aluminum grades and concrete strengths were generated for parametric studies. The influences of diameter-to-thickness ratios, aluminum grades and concrete strengths on the ultimate strength were presented in this paper.

scholarly journals Behavior of Axially Loaded Stirrup Confinement Rectangular Concrete-Filled Steel Tubular Stub Columns

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Jing Liu ◽  
Wen-jun Wang ◽  
Fa-xing Ding ◽  
Xin-fa Zeng ◽  
Zhe Tan ◽  
...  
Keyword(s):  
Finite Element ◽  
Axial Compression ◽  
Steel Tube ◽  
Steel Pipe ◽  
Fe Model ◽  
Ultimate Capacity ◽  
Concrete Core ◽  
Bearing Strength ◽  
Stiffening Ribs ◽  
Stub Columns

This article presents the experimental and finite element (FE) analyses of two conventional rectangular concrete-filled steel tubular (CFT) stub columns, two stiffened rectangular concrete-filled steel tubular (SCFT) stub columns, and two stirrup confinement rectangular concrete-filled steel tubular (CCFT) stub columns concentrically loaded in compression to failure. The influences of the ductility and ultimate bearing strength of these stub columns with stiffening ribs or spiral stirrup confinement were discussed. Abaqus was used to establish a 3D FE model and analyze the properties of CFT stub columns subjected to axial compression. The effect of the concrete core and rectangular steel tube under loop stirrup confinement was discussed. Analytical results showed that spiral stirrup confinement can availably retard the local bucking of the rectangular steel pipe, and the effect of the spiral stirrup confinement was stronger than that of stiffeners. The DI values of SCFT and CCFT were 21.9% and 31.9% larger than those of CFT, respectively. The ultimate capacity values of SCFT and CCFT were 10.2% and 18% larger than those of CFT, respectively. The ductility and ultimate bearing strength of the specimens improved effectively under spiral stirrup confinement, and the ductility of the CCFT columns was preferable to that of the SCFT columns.

Temperature Field and Extrusion Load in Needle Piercing Extrusion Process Based on Ingot Billet for Large 7075 Aluminum Alloy Tube

2012 ◽  
Vol 217-219 ◽  
pp. 1734-1739 ◽  
Author(s):  
Liang Gang Guo ◽  
Ke Ke Dong ◽  
He Yang ◽  
Wen Da Zheng ◽  
Jun Zhang
Keyword(s):  
Aluminum Alloy ◽  
Temperature Field ◽  
Extrusion Process ◽  
Fe Model ◽  
7075 Aluminum Alloy ◽  
Extrusion Speed ◽  
Billet Temperature ◽  
Alloy Tube ◽  
Initial Billet ◽  
Aluminum Alloy Tube

Abstract. The change rules of the billet temperature field and extrusion load are the significant basis for the optimal design of the needle piercing extrusion process based on ingot billet for the manufacture of large-diameter thick-walled tube. Taking the needle piercing extrusion process of a 7075 aluminum alloy tube with sizes of Φ500mmx400mm/6000mm as study object, we developed a precise FE model for the process under DEFORM-2D environment, then numerically revealed the distributions and evolution rules of the billet temperature field, and obtained the effects of the extrusion speed and initial billet temperature on the billet temperature filed and extrusion load. The results show that the peak extrusion load decreases linearly with the increase of initial billet temperature but is insensitive to the extrusion speed, and that the peak temperature rises with the increase of the extrusion speed and initial billet temperature, and always locates on the surface of the initially extruded tube close to the exit of the cavity die.

scholarly journals Analytical Modelling of LACFCST Stub Columns Subjected to Axial Compression

Mathematics ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 948
Author(s):  
Yunlong Xu ◽  
Fei Lyu ◽  
Faxing Ding ◽  
Chenglu Liu ◽  
En Wang
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Lightweight Aggregate ◽  
Element Model ◽  
Design Parameters ◽  
Lightweight Aggregate Concrete ◽  
Superposition Method ◽  
Aggregate Concrete ◽  
Stub Column ◽  
Stub Columns

This paper presents a numerical investigation of lightweight aggregate concrete-filled circular steel tubular (LACFCST) stub columns under axial compression. A finite 3D solid element model of the LACFCST stub column was established by adopting a plastic-damage constitutive model of lightweight aggregate concrete (LAC). The finite element model (FEM) analysis results revealed that the confinement effect of the steel tube on the infilled LAC was weaker than that on the infilled conventional concrete. A parametric study making use of 95 full-scale FEMs was conducted to investigate the influences of various design parameters of LACFCST stub columns on their ultimate axial bearing capacity and the composite actions. Moreover, a numerical model of the axial and transverse stress of steel tubes at the ultimate state of LACFCST columns was proposed using the regression method. Based on the equilibrium conditions and the proposed model, a practical design formula making use of an enhancement factor was derived to estimate the ultimate bearing capacity of LACFCST stub columns by using the superposition method. The validity of the proposed formula was verified against the experimental data of 49 LACFCST stub column specimens under the axial loading available in the literature. Meanwhile, the accuracy and conciseness of the proposed formula were evaluated by comparison with the formulas suggested by the existing design codes.

The impact of stirrups on the composite action of concrete-filled steel tubular stub columns under axial loading

Structures ◽  
2021 ◽  
Vol 30 ◽  
pp. 786-802
Author(s):  
De-ren Lu ◽  
Wen-jun Wang ◽  
Fa-xing Ding ◽  
Xue-mei Liu ◽  
Chang-jing Fang
Keyword(s):  
Axial Loading ◽  
Composite Action ◽  
The Impact ◽  
Stub Columns
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