Study on Rubberized Concrete-Filled Steel Tubular Stub Columns Under Axial Compression

2020 ◽  
Vol 12 (9) ◽  
pp. 1371-1380
Author(s):  
Yanhua Liu ◽  
Shiyu Tong ◽  
Qingxin Ren
Keyword(s):  
Finite Element Analysis ◽  
Particle Size ◽  
Rubber Particle ◽  
Local Buckling ◽  
Steel Tube ◽  
Rubberized Concrete ◽  
Replacement Ratio ◽  
Element Analysis ◽  
Rubber Particles ◽  
Stub Columns

In order to study the behavior of rubberized concrete-filled steel tubular (RuCFST) stub columns, an innovative composite member with steel tube and concrete filled with rubber particles was made. Twenty-four RuCFST stub columns were tested, in which six conventional CFST stub columns were prepared for comparison. The effects of changing rubber particle size (in the range of 1–2 mm and 2–5 mm) and rubber replacement ratio (0%, 10%, 20% replacement of sand) were made to discover the characteristics of the columns. The tested RuCFST stub columns displayed a local buckling similar to the conventional CFST stub columns. The tested results are compared with the predicted results of finite element analysis and the existing codes of CFST. Generally, the agreement between the predictions and results are reasonable.

Experimental Investigation and Finite Element Analysis on Concrete-Filled Steel Tubular Gusset Plate Connections

2013 ◽  
Vol 721 ◽  
pp. 701-705
Author(s):  
Wen Feng Duan ◽  
Chang Liu ◽  
Bao Zhu Cao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Performance ◽  
Local Buckling ◽  
Steel Tube ◽  
Seismic Behaviour ◽  
Element Analysis ◽  
Gusset Plate ◽  
Long Span ◽  
Circular Steel Tube

The use of concrete-filled steel tubes in different areas of construction is becoming an attractive solution because of its remarkable performance. It provides not only an increase in the load carrying capacity but also good seismic behaviour. It is often adopted as compression member especially for structure under large axial pressure. Concrete-filled steel tubular composite truss can be used as main load-bearing structure of long-span and mega structure. But the composite trusses were connected by mutually intersecting joints which the welding construction process is complicated and the quality is unstable. Therefore, gusset plate joints are more suitable. So experimental study and finite element analysis are carried out in 12 specimens. Test results indicate that bearing capacity of hollow circular steel tube joints filled with concrete is provided obviously, and local buckling performance of steel tube under gusset plate is also improved. In order to study the mechanical performance and interaction of steel tube and core concrete, the ANSYS program is adopted in finite element analysis. And the analysis results is agreed well with the test. Regression analysis is carried out at the same time, thus simplified calculated formula of this type joints is concluded which can give reference for the designers.

Finite Element Analysis of RPC-Filled Steel Tube Stub Columns

2011 ◽  
Vol 189-193 ◽  
pp. 1906-1909 ◽  
Author(s):  
Hua Luo ◽  
Zhi Gang Yan ◽  
Ming Zhe An
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Strength ◽  
Element Model ◽  
Steel Tube ◽  
Nonlinear Material ◽  
Steel Tubes ◽  
Element Analysis ◽  
Reactive Powder ◽  
Stub Columns

Reactive Powder Concrete (RPC) is a kind of cement-based composite which has ultra-high strength, high ductility and durability. RPC has great fragility, bad ductility and bursting fragility destruction subjected to high or complicated stress. The fragility performance of RPC will be improved when RPC is cast in steel tubes. The behavior of axially loaded RPC-filled steel tube circular stub columns is presented in this discussion according to the experiment and finite element analysis. An accurate finite element model was developed to carry out the analysis. Accurate nonlinear material models for confined concrete and steel tubes were used. The results obtained from the finite element analysis were verified against experimental results.

Numerical Model of Cold Press-Formed Square Steel Tube Columns Considered with Degradation Behavior due to Local Buckling and/or Fracture

2018 ◽  
Vol 763 ◽  
pp. 533-540
Author(s):  
Yuji Koetaka ◽  
Koichi Taniguchi ◽  
Iathong Chan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Numerical Model ◽  
Local Buckling ◽  
Steel Tube ◽  
Degradation Behavior ◽  
Loading Test ◽  
Element Analysis ◽  
Cold Press ◽  
Square Steel Tube

In steel building structures, local buckling and/or fracture of columns could occur during strong ground motions, furthermore complete collapse might be induced due to the column strength degradation. In this paper, cold press-formed square tube columns are targeted, and numerical model being able to trace precisely degradation behavior is proposed. In order to take account of both local buckling and fracture with low computational costs, multi-spring model which consists of some uni-axial springs is adopted. Axial force-deformation relationships of uni-axial springs are provided on flat area and corner area of square tube severally, and are separated into skeleton part and hysteresis part. All parameters on force-deformation relationship are identified based on finite element analysis results of short columns under monotonic or cyclic axial loading. Comparing between analysis results by multi-spring models and past cyclic loading test results or finite element analysis results, it is clarified that degradation behavior of cold press-formed square steel tube columns can be traced with high accuracy.

scholarly journals Finite Element Analysis on Behavior of Reinforced Hollow High Strength Concrete Filled Square Steel Tube Short Columns under Axial Compression

2021 ◽  
Vol 2101 (1) ◽  
pp. 012059
Author(s):  
Z J Yang ◽  
X Li ◽  
G C Li ◽  
S C Peng
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Strength Concrete ◽  
Mechanical Performance ◽  
Concrete Strength ◽  
High Strength ◽  
Steel Tube ◽  
Element Analysis ◽  
Steel Strength ◽  
Square Steel Tube

Abstract Hollow concrete-filled steel tubular (CFST) member is mainly adopted in power transmission and transformation structures, but when it is used in the superstructure with complex stress, the hollow CFST member has a low bearing capacity and is prone to brittle failure. To improve the mechanical performance of hollow CFST members, a new type of reinforced hollow high strength concrete-filled square steel tube (RHCFSST) was proposed, and its axial compression performance was researched. 18 finite element analysis (FEA) models of axially loaded RHCFSST stub columns were established through FEA software ABAQUS. The whole stress process of composite columns was studied, and parametric studies were carried out to analyze the mechanical performance of the member. Parameters of the steel strength, steel ratio, deformed bar and sandwich concrete strength were varied. Based on the simulation results, the stress process of members can be divided into four stages: elastic stage, elastoplastic stage, descending stage and gentle stage. With the increase of steel strength, steel ratio, the strength of sandwich concrete and the addition of deformed bars, the ultimate bearing capacity of members also increases. Additionally, the increment of those parameters will improve the ductility of the member, except for the sandwich concrete strength.

scholarly journals Finite element analysis of mechanical behavior of concrete-filled square steel tube short columns with inner I-shaped CFRP profiles subjected to bi-axial eccentric load

2018 ◽  
Author(s):  
Guochang Li ◽  
Zhichang Zhan ◽  
Zhijian Yang ◽  
Yu Yang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Compressive Strength ◽  
Steel Tube ◽  
Concrete Compressive Strength ◽  
Eccentric Load ◽  
Element Analysis ◽  
Composite Columns ◽  
Short Columns ◽  
Square Steel Tube

The concrete-filed square steel tube with inner I-shaped CFRP profiles short columns under bi-axial eccentric load were investigated by the finite element analysis software ABAQUS. The working mechanism of the composite columns which is under bi-axial eccentric load are investigated by using the stress distribution diagram of steel tube concrete and the I-shaped CFRP profiles. In this paper, the main parameters; eccentric ratio, steel ratio, steel yield strength, concrete compressive strength and CFRP distribution rate of the specimens were investigated to know the mechanical behavior of them. The interaction between the steel tube and the concrete interface at different characteristic points of the composite columns were analyzed. The results showed that the ultimate bearing capacity of the concrete-filed square steel tube with inner I-shaped CFRP profiles short columns under bi-axial eccentric load decrease with the increase of eccentric ratio, the ultimate bearing capacity of the composite columns increase with the increase of steel ratio, steel yield strength, concrete compressive strength and CFRP distribution rate. The contact pressure between the steel tube and the concrete decreased from the corner zone to the flat zone, and the contact pressure decreased from the mid-height cross section to other sections.

Research on Modifier and Modified Process for Rubber-Particle Used in Rubberized Concrete for Road

2011 ◽  
Vol 243-249 ◽  
pp. 4125-4130 ◽  
Author(s):  
Shuai Tian ◽  
Tong Zhang ◽  
Ye Li
Keyword(s):  
Inorganic Salt ◽  
Rubber Particle ◽  
Volume Ratio ◽  
Alkaline Solutions ◽  
Rubberized Concrete ◽  
Function Mechanism ◽  
Mix Proportion ◽  
Optimum Proportion ◽  
Rubber Particles ◽  
The Impact

This paper studies the optimum proportion of rubber-particles in rubberized concrete for road, tests the impact of 12 modifiers and their modified processes in rubberized concrete and discusses the function mechanism of the modifiers in rubberized concrete. Research indicates: the optimum proportion of rubber-particles in rubberized concrete for road is low mix-proportion (volume ratio<5%); inorganic salt as modifier can markedly enhance the bonding strength between rubber-particles used in road and cement and improve the physical properties of rubberized concrete, among which CaCl2 produces the most effect; but organic solution, acidic or alkaline solutions are not fit to be used as modifiers in rubberized concrete for road.

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