Behaviour of uni-axially loaded concrete-filled-steel-tube columns confined by external rings

2012 ◽  
Vol 23 (6) ◽  
pp. 403-426 ◽  
Author(s):  
M. H. Lai ◽  
J. C. M. Ho
Keyword(s):  
Steel Tube ◽  
Concrete Filled Steel Tube ◽  
Axially Loaded

Research on the Properties of the Concrete Filled Steel Tube Columns with CFRP Composite Materials

2010 ◽  
Vol 163-167 ◽  
pp. 3555-3559
Author(s):  
Wei Gu ◽  
Hong Nan Li
Keyword(s):  
Composite Materials ◽  
Research Program ◽  
Steel Tube ◽  
Experimental Results ◽  
Composite Tubes ◽  
Concrete Filled Steel Tube ◽  
Damage Area ◽  
Cfrp Composite ◽  
Axially Loaded ◽  
Strengthening Method

This paper presents a phase of the research program to determine the feasibility of a proposed CFRP retrofit method to strengthen the corroded concrete filled steel tube columns. This method is wrapping the corroded concrete filled steel tube column with CFRP material. Eight concrete filled steel tube columns were tested in the laboratory with four of them strengthened using the proposed technique. All specimens were notched in the center zone to simulate the loss of section due to corrosion the four of them were wrapped with CFRP composite tubes in the damage area. All specimens were axially loaded to failure while strain and displacement were measured to demonstrate the validity of this repair concept. This paper presents the experimental results and discusses the findings with preliminary conclusions on the feasibility of the proposed strengthening method.

scholarly journals Compatibility Optimal Design of Axially Loaded Circular Concrete-Filled Steel Tube Stub Columns

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4839
Author(s):  
Jinglin Fan ◽  
Fei Lyu ◽  
Faxing Ding ◽  
Dan Bu ◽  
Siqing Wang ◽  
...  
Keyword(s):  
Constitutive Models ◽  
High Strength ◽  
Steel Tube ◽  
Design Parameters ◽  
Material Strength ◽  
Concrete Filled Steel Tube ◽  
Combined Use ◽  
Axially Loaded ◽  
Stub Columns

Numerous studies have been carried out on the axially loaded circular concrete-filled steel tube (CCFST) stub columns. However, to date, no clear evaluation criterion for the compatibility of its design parameters has been established. In the present study, the compatibility of the design parameters (concrete compressive strength fc, steel yield strength fy, diameter D and thickness of steel tube t) of axially loaded CCFST stub columns was quantitatively investigated in terms of the contribution of the composite actions to the axial bearing capacity of the columns. The composite ratio λ was proposed as an indicator to represent the effectiveness of the composite actions. A numerical framework of the determination of λ was established, making use of a series of existing widely recognized constitutive models of structural steel and concrete. Some modifications were carried out on these models to ensure the numerical stability of the presented analysis. Moreover, the rationality of the combined use of these models was verified. The analytical results show that excessive or very small D/t ratio should be avoided in design. Meanwhile, the combined use of low-strength steel and high-strength concrete should be avoided. A table of optimal D/t ratios corresponding to different material strength matches was provided for designers. Finally, an optimization of the design parameters using the proposed method and the existing design specification was performed.

Strength of Axially Loaded Concrete Filled Steel Tube Elements of Self-Stressing Concrete

2018 ◽  
Vol 792 ◽  
pp. 160-165 ◽  
Author(s):  
Anatoly L. Krishan ◽  
Maria A. Astafyeva ◽  
Elvira P. Chernyshova
Keyword(s):  
Experimental Research ◽  
High Performance ◽  
High Performance Concrete ◽  
Steel Tube ◽  
Elastic Behavior ◽  
Use Of Self ◽  
Circular Section ◽  
Concrete Filled Steel Tube ◽  
Axially Loaded ◽  
Case Effect

This work is dedicated to an experimental research of strength and resistance characteristics of axially loaded concrete filled steel tube elements of self-stressing concrete, including high-performance concrete. Labcrete specimens of circular section 112 mm in diameter and 1000 mm in length were used in experiments. The research shows that the use of self-stressing concrete increased the strength of the specimens by approximately 10%, and enhanced elastic behavior limit by 20-33%. In the course of testing self-stressing concrete specimens, registered longitudinal deformations were within 0.52-0.75%. Analysis of the obtained results indicates a significantly greater case effect in the pre-stressed specimens. This effect is somewhat less pronounced in high-performance concrete specimens, yet still prominent.

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