scholarly journals Strength of Short Concrete Filled Steel Tube columns of Annular Cross Section

2018 ◽  
Vol 463 ◽  
pp. 022062 ◽  
Author(s):  
A L Krishan ◽  
V I Rimshin ◽  
E A Troshkina
Keyword(s):  
Cross Section ◽  
Steel Tube ◽  
Concrete Filled Steel Tube ◽  
Annular Cross Section

scholarly journals Compressed Concrete Filled Steel Tube Elements of Annular Cross-Section

2018 ◽  
pp. 144-148
Author(s):  
Vladimir I. Rimshin ◽  
Anatoly L. Krishan ◽  
Evgenia A. Troshkina
Keyword(s):  
Cross Section ◽  
Complex Stress ◽  
Steel Tube ◽  
Complex Stress State ◽  
Steel Shell ◽  
Mechanics Of Solids ◽  
Concrete Core ◽  
Concrete Filled Steel Tube ◽  
Annular Cross Section ◽  
Initial Modulus

The problem of determining the strength of a short centrally compressed concrete-filled steel tube element of annular cross-section is considered. The corresponding calculation procedure is proposed. The procedure is based on the theoretical positions of the mechanics of solids and it implements the method of limiting forces. It considers the complex stress state of the concrete core and steel shell as well as nonuniform distribution of transversal stresses over the cross-section of the calculated element. If there is high-strength reinforcement in the concrete, the stress in it is calculated considering the increased deformability of the concrete. The dependences for determining the initial modulus of elasticity of concrete as well as ultimate relative strains of uniaxially compressed and volumetrically compressed concrete are presented. The proposed procedure is applicable to structures made of different concrete types and steel classes.

Numerical Simulation on Temperature Field of CFST Member under Solar Radiation

2011 ◽  
Vol 354-355 ◽  
pp. 1241-1244
Author(s):  
Yan He ◽  
Man Ding ◽  
Qian Zhang
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Temperature Distribution ◽  
Solar Radiation ◽  
Cross Section ◽  
Temperature Difference ◽  
Steel Tube ◽  
Concrete Filled Steel Tube ◽  
Nonlinear Temperature ◽  
The Cross

In this paper the temperature field of Concrete Filled Steel Tube (CFST) member under solar radiation is simulated. The results show that temperature distribution caused by solar radiation is nonlinear over the cross-section of CFST member, and it is significantly varied with time and sections, the largest nonlinear temperature difference is over 26.3°C.

scholarly journals PZT-Based Detection of Compactness of Concrete in Concrete Filled Steel Tube Using Time Reversal Method

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Shi Yan ◽  
Jinzhi Fu ◽  
Wei Sun ◽  
Baohui Qi ◽  
Fuxue Liu
Keyword(s):  
Cross Section ◽  
Time Reversal ◽  
Rectangular Cross Section ◽  
Concrete Columns ◽  
Steel Tube ◽  
Time Reversibility ◽  
Concrete Filled Steel Tube ◽  
Sensing System ◽  
Two Indices ◽  
Cfst Columns

A smart aggregate-based approach is proposed for the concrete compactness detection of concrete filled steel tube (CFST) columns. The piezoceramic-based smart aggregates (SAs) were embedded in the predetermined locations prior to the casting of concrete columns to establish a wave-based smart sensing system for the concrete compactness detection purpose. To evaluate the efficiency of the developed approach, six specimens of the CFST columns with the rectangular cross-section were produced by placing some artificial defects during casting of concrete for simulating various uncompacted voids such as cavities, cracks, and debond. During the test, the time reversal technology was applied to rebuild the received signals and launch the reversed signals again by SAs, to overcome the issue of the lack of the prototype. Based on the proposed nonprototype, two indices of time reversibility (TR) and symmetry (SYM) were applied to relatively evaluate the level of concrete compactness in the range of the two SAs. The experimental results show that the developed method can effectively detect the compactness of concrete in CFST columns.

scholarly journals Accounting for the Scale Factor in Determining the Compressed Concrete Strength of Concrete-Filled Steel Tube Elements

2019 ◽  
Vol 278 ◽  
pp. 03003
Author(s):  
Elvira P. Chernyshova ◽  
Vladislav E. Chernyshov
Keyword(s):  
Experimental Data ◽  
Axial Compression ◽  
Cross Section ◽  
Concrete Strength ◽  
Circular Cross Section ◽  
Steel Tube ◽  
Scale Factor ◽  
Concrete Filled Steel Tube ◽  
New Formula

The published experimental data on the influence of the concrete samples dimensions on their strength under axial compression had been analyzed in the article. The mechanism of this influence is revealed from the positions of strength statistical theories. The known dependences are given and a new formula is proposed for taking into account the scale factor in determining the strength of compressed concrete. An algorithm for calculating the strength of centrally compressed concrete-filled steel tube elements (CFSTE) with a circular cross-section taking into account the scale factor is shown.

scholarly journals Strength and Deformability of the Concrete Core of Precompressed Concrete Filled Steel Tube Columns of Annular Cross-Section

2019 ◽  
Vol 278 ◽  
pp. 03002
Author(s):  
Anatoly Krishan ◽  
Mariia Astafeva
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Structural Features ◽  
Steel Tube ◽  
Ultimate Strain ◽  
Deformation Model ◽  
Actual Behavior ◽  
Deformation Diagram ◽  
Concrete Core ◽  
Concrete Filled Steel Tube

The advantages of short concrete filled steel tube columns with a precompressed concrete core are presented in the article. Particular cases, where such compression is most appropriate, are listed. Taking into consideration the structural features of concrete filled steel tube columns it is recommended to calculate their bearing capacity on the basis of deformation model of reinforced concrete. The reliability of this calculation will be largely dependent on the conformity of the accepted diagram of the concrete core deformation with its actual behavior. Formulas for determining the strength of precompressed concrete core and the ultimate strain of its shortening are proposed, which allow constructing the sufficiently accurate deformation diagram.

scholarly journals Calculating the Strength of Concrete Filled Steel Tube Columns of Solid and Ring Cross-section

2016 ◽  
Vol 150 ◽  
pp. 1878-1884 ◽  
Author(s):  
A.L. Krishan ◽  
E.P. Chernyshova ◽  
R.R. Sabirov
Keyword(s):  
Cross Section ◽  
Steel Tube ◽  
Concrete Filled Steel Tube

scholarly journals M-N interaction curves for rectangular concrete-filled steel tube columns subjected to uniaxial bending moments

2022 ◽  
Vol 15 (1) ◽  
Author(s):  
Matheus Fernandes ◽  
Silvana De Nardin ◽  
Fernando Menezes de Almeida Filho
Keyword(s):  
Cross Section ◽  
Normal Force ◽  
Theoretical Models ◽  
Steel Tube ◽  
Area Ratio ◽  
Good Precision ◽  
Bending Moments ◽  
Concrete Filled Steel Tube ◽  
Composite Columns ◽  
Interaction Curves

abstract: In this paper, a computational code was developed to obtain M-N interaction curves for rectangular concrete-filled steel tube columns considering the strain compatibility in the cross-section. Considering the composite section subjected to uniaxial bending moments, expressions were developed to determine normal force, moment resistance, neutral axis depth and components resistance of cross-section. Such expressions were implemented in a computational tool developed to the authors and that allows to obtain the M-N pairs of strength. The steel and concrete ultimate strains were defined with the aid of the Brazilian standard for reinforced concrete structures ABNT NBR 6118. The obtained results were compared to simplified curves defined according to the theoretical models of ABNT NBR 8800, ABNT NBR 16239, EN 1994-1-1 and literature data. The proposed model showed good agreement with literature results and had good precision to estimate the ultimate moment values. To further understand the resistance of composite columns under uniaxial bending moments, parametric study was performed to evaluate the influence of the compressive strength of concrete, yielding strength of steel and steel area ratio on M-N interaction curves. The results indicate that the yielding strength of steel and the steel area ratio were the variables that most influenced the values of composite columns resistance (normal force and bending moment).

Sign in / Sign up

Export Citation Format

Share Document