Lateral behavior of full-scale concrete-filled carbon composite columns

2004 ◽  
Vol 31 (2) ◽  
pp. 189-203 ◽  
Author(s):  
Won-Kee Hong ◽  
Hee-Cheul Kim ◽  
Suk-Han Yoon
Keyword(s):  
Concrete Strength ◽  
Concrete Columns ◽  
Carbon Composite ◽  
Full Scale ◽  
Filament Winding ◽  
Stress Strain ◽  
Composite Tubes ◽  
Moment Capacity ◽  
Composite Columns ◽  
Lateral Behavior

Full scale concrete-filled carbon composite columns without longitudinal and transverse reinforcing steels are tested to investigate the lateral behavior of columns confined with carbon composite tubes. In the present study, the full-scale circular and square concrete-filled carbon composite tubes (CFCTs) with various winding angles with respect to longitudinal axes of the tubes are subjected to lateral loads under a constant axial load. The influence of thickness and winding angle of carbon tubes on the lateral behavior of concrete columns is studied both experimentally and analytically, demonstrating that the calculated ultimate moment capacity of confined columns compares well with test data. For this analytical process, stress–strain relationships of confined concrete columns uncovered by the authors are used to identify the distribution of confined compressive concrete strength at failure. This stress–strain model considers the influence of winding orientation of carbon fibers on the confining capability of the concrete core.Key words: carbon composite, lateral capacity of confined column, strength, filament winding.

Behavior of concrete columns confined by carbon composite tubes

2004 ◽  
Vol 31 (2) ◽  
pp. 178-188 ◽  
Author(s):  
Won-Kee Hong ◽  
Hee-Cheul Kim
Keyword(s):  
Large Scale ◽  
Glass Fibers ◽  
Testing Machine ◽  
Concrete Columns ◽  
Longitudinal Axis ◽  
Carbon Composite ◽  
Filament Winding ◽  
Axial Loads ◽  
Composite Tubes ◽  
Filament Wound

The carbon composite tube can play an important role in replacing or complementing longitudinal and transverse reinforcing steels by providing ductility and strength for conventional columns. In this study, both experimental and analytical investigations of axial behavior of large-scale circular and square concrete columns confined by carbon composite tubes are presented. The specimens are filament-wound carbon composite with 90° + 90°, 90° ± 60°, 90° ± 45°, and 90° ± 30° winding angles with respect to a longitudinal axis of a tube. The instrumented large-scale concrete-filled composite tubes are subjected to monotonic axial loads exerted by a 10 000 kN universal testing machine (UTM). The influence of transverse dilation, winding angle, thickness of a tube, as well as shape of the column section on stress–strain relationships of the confined columns is identified and discussed. Proposed equations to predict both strength and ductility of confined columns by carbon composite tubes demonstrate good correlation with test data obtained from large-scale specimens.Key words: carbon composites, glass fibers, strength, filament winding.

Experimental Study on Mechanical Properties of Axially Loaded PVC Tubed Short Concrete Columns

2011 ◽  
Vol 99-100 ◽  
pp. 715-718 ◽  
Author(s):  
Jun Dong ◽  
De Ping Chen ◽  
Ju Mei Zhao ◽  
De Shan Shan ◽  
Xin Yue Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carrying Capacity ◽  
Loading Condition ◽  
Concrete Strength ◽  
Concrete Columns ◽  
Load Carrying Capacity ◽  
Composite Columns ◽  
Load Carrying ◽  
Strength And Deformation ◽  
Axially Loaded

Twelve PVC tubed short concrete columns and four columns without PVC tube confined were tested under axial load to investigate mechanical properties of axially loaded PVC tubed short concrete columns . The principal influencing factors such as concrete strength, loading condition and ratio of height to diameter were studied. Test results indicated that strength and deformation performance of core concrete increased as a result of the confinement of PVC tube. The PVC tube confinement effect on concrete will decrease with an increase in strength of concrete. Load- carrying capacity and deformation of short composite columns with different loading condition made some difference. As the ratio of height to diameter increases, load- carrying capacity and plasticity of short composite columns decreased gradually.

Loading Process Simulation of GFRP Tube Filled with Steel-Reinforced High-Strength Concrete Columns Subjected to Eccentric Compression

2011 ◽  
Vol 71-78 ◽  
pp. 4203-4206
Author(s):  
Le Zhou ◽  
Hong Tao Liu
Keyword(s):  
High Strength Concrete ◽  
Slenderness Ratio ◽  
Concrete Strength ◽  
High Strength ◽  
Concrete Columns ◽  
Composite Columns ◽  
Strength Concrete ◽  
Finite Strip Method ◽  
Eccentric Compression ◽  
High Strength Concrete Columns

For the further study of bearing compressive capacity of GFRP tube filled with SHC（steel-reinforced high-strength concrete）columns subjected to eccentric compression, and analysis its whole bearing compressive process under eccentric compression. Based on the flat section assumption finite strip method, the calculating program of bearing eccentric compressive capacity of GFRP tube filled with SHC columns is proposed according to existing retrofit theory and related technical procedures. The relation curves of load-deformation is gotten using this calculating program, at the same time it can get the effect curves of concrete strength, slenderness ratio, eccentricity and containing bone rate to load-deformation. Calculations show that the ultimate bearing compressive capacity of composite column decreases with the increase of slenderness ratio, and elastic stage of component curve gradually shortens and stiffness gradually loses; The ultimate bearing compressive capacity of composite columns decreases with the increase of eccentricity; component ductility improves; the ultimate bearing compressive capacity of composite columns increases with the increase of concrete strength. The calculated results agree well with the experimental results and this study provides a basis for practical design.

Nonlinear Analysis of Eccentric Compression of GFRP Tube Filled with SRHC Columns

2012 ◽  
Vol 476-478 ◽  
pp. 1562-1567
Author(s):  
Le Zhou ◽  
Lian Guang Wang ◽  
Peng Niu ◽  
Hong Bin Nie
Keyword(s):  
Slenderness Ratio ◽  
Concrete Strength ◽  
High Strength ◽  
Concrete Columns ◽  
Composite Columns ◽  
Finite Strip ◽  
Finite Strip Method ◽  
Eccentric Compression ◽  
High Strength Concrete Columns ◽  
Elastic Stage

The whole bearing compressive process under eccentric compression is analyzed for the further study of bearing compressive capacity of GFRP tube filled with SHC（steel-reinforced high-strength concrete）columns subjected to eccentric compression. Based on finite strip method from the plane cross-section assumption, the computation program of bearing eccentric compressive capacity of GFRP tube filled with SHC columns is formulated according to the existing retrofit theory and related technical procedures. The relation curves of load-deformation, as well as the effect curves of concrete strength, slenderness ratio, eccentricity and containing bone rate to load-deformation is obtained by means of this calculating program. Calculations show that the ultimate bearing compressive capacity of composite column decreases with the increase of slenderness ratio, elastic stage of component curve gradually shortens and stiffness gradually loses; The ultimate bearing compressive capacity of composite columns decreases with the increase of eccentricity; component ductility improves; the ultimate bearing compressive capacity of composite columns increases with the increase of concrete strength. The calculated results agree well with the experimental results and provides a basis for practical design

Comparative strength analyses of structural concrete columns

2006 ◽  
Vol 33 (6) ◽  
pp. 735-747
Author(s):  
Sher Ali Mirza
Keyword(s):  
Reinforced Concrete ◽  
Computational Methods ◽  
Slenderness Ratio ◽  
Concrete Strength ◽  
Concrete Columns ◽  
Normal Density ◽  
Structural Concrete ◽  
Composite Columns ◽  
Physical Tests ◽  
Composite Steel

A comparative study was undertaken of selected computational methods for predicting the strength determined from more than 500 physical tests of rectangular, tied structural concrete columns available in the literature. The study included 354 reinforced concrete and 150 composite steel–concrete columns. The computational methods compared were those of CSA A23.3-94 and Eurocode 2 for reinforced concrete and those of CSA A23.3-94 and Eurocode 4 for composite columns. The physical tests used for comparison were conducted on columns that were braced, pinned at both ends, subjected to short-term loads, and constructed using normal-density concrete with a compressive strength between approximately 17 and 57 MPa. Major variables included the concrete strength, the end eccentricity ratio, the slenderness ratio, the longitudinal reinforcing steel index for reinforced concrete or the structural steel index for composite columns, and the transverse reinforcement (tie/hoop) volumetric ratio. The study provided insights into the reliability of the computational methods examined. Recommendations for improving the CSA A23.3-94 procedure for the design of reinforced concrete and composite steel–concrete columns are also presented.Key words: columns, composite construction, computations, physical tests, reinforced concrete, reliability, strength.

scholarly journals Experimental Study on CFRP-Confined Circularized Concrete-Filled Square Steel Tube Short Columns

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Yuchuan Wen ◽  
Zhongjun Hu ◽  
Anningjing Li ◽  
Quanheng Li ◽  
Xuepeng Li ◽  
...  
Keyword(s):  
Concrete Strength ◽  
Concrete Columns ◽  
Steel Tube ◽  
Confined Concrete ◽  
Test Results ◽  
Stress Strain ◽  
Short Columns ◽  
Reinforced Polymer ◽  
Square Steel Tube ◽  
Strain Model

This study investigates the suitability of the circularization technique for strengthening square concrete-filled square steel tube (CFSST) short columns. A total of 16 specimens were tested under axial compression. The main parameters under investigation were concrete strength, the thickness of arc cement mortar layer components (CAM), and the layers of carbon fiber-reinforced polymer (CFRP) sheets. Test results indicated that the failure mode of CFRP-confined circularized CFSST (C-C-CFSST) columns was similar to that of CFRP-confined concrete columns. The CFRP-confined circularized strengthening method can increase confinement efficacy and reduce the stress concentration at the corners of CFSST columns. Three existing CFRP-confined concrete stress-strain models were evaluated using the test results. The predictions of the Lam and Teng stress-strain model agree well with the test data.

Experimental and Numerical Investigation on the Torsional Behaviour of Filament Winding-Manufactured Composite Tubes

2016 ◽  
Vol 834 ◽  
pp. 173-178 ◽  
Author(s):  
Gabriel Mansour ◽  
Kostas Tzikas ◽  
Dimitrios Tzetzis ◽  
Apostolos Korlos ◽  
Dimitrios Sagris ◽  
...  
Keyword(s):  
Torsion Test ◽  
Numerical Approach ◽  
Carbon Composite ◽  
Filament Winding ◽  
Torsional Loading ◽  
Theoretical Relation ◽  
Composite Tubes ◽  
Element Analysis ◽  
Test Speed ◽  
Twisting Angle

The present work is focused in the examination of the torsional behaviour of composite tubes by a combined experimental and numerical approach. Glass and carbon composite tubes were manufactured by the filament winding technique. All the tubes were fabricated with glass and carbon Fiber orientation at ±45°. The effect of the torsional loading on the mechanical strength of the glass and carbon composite tubes was initially studied experimentally. Angular velocity of 5° per min was used as torsion test speed while torque-twisting angle changes were recorded. The torsional behaviour of composite tubes was also simulated using Finite Element Analysis (FEA). An elastic orthotropic composite model was used for the simulations. The normal and shear stress contours were obtained from the FE models, while the theoretical relation of the torque versus the twisting angle was calculated. Comparison of the numerical and experimentally obtained results has shown a relatively similar torsional behaviour.

scholarly journals Examination of Strength Modeling Reliability of Physical Tests on Structural Concrete Columns

2011 ◽  
Vol 2011 ◽  
pp. 1-16 ◽  
Author(s):  
Sher Ali Mirza
Keyword(s):  
Axial Force ◽  
Slenderness Ratio ◽  
Concrete Strength ◽  
Concrete Columns ◽  
American Concrete Institute ◽  
Normal Density ◽  
Structural Concrete ◽  
Composite Columns ◽  
Physical Tests ◽  
Computational Procedures

Comparisons and analyses of strengths from selected computational procedures were undertaken of more than 500 physical tests of rectangular, tied, structural concrete columns reported in the published literature. The computational procedures compared with the physical tests and with each other include a commercially available nonlinear finite element modeling software and the Canadian Standards Association (CSA) Standard A23.3-04. The requirements of the American Concrete Institute (ACI) 318-08 are very similar to those of the CSA A23.3-04, and hence, strength comparisons and analyses reported here are also applicable to ACI 318-08. The physical tests used for comparison were conducted on columns that were braced and pinned at both ends and were constructed using normal-density concrete with a compressive strength between approximately 17 and 57 MPa. The columns were subjected to short-term loads producing pure axial force, axial force combined with symmetrical single-curvature bending, or pure bending. Major variables included the concrete strength, the end eccentricity ratio, the slenderness ratio, the longitudinal reinforcing steel index for reinforced concrete or the structural steel index for composite columns, and the transverse reinforcement (tie/hoop) volumetric ratio. The study provides an examination of the reliability of the computational methods examined.

scholarly journals CARBON FIBER REINFORCED CONCRETE COLUMNS UNDER STATIC AND DYNAMIC LOADS

2018 ◽  
pp. 111-121 ◽  
Author(s):  
A. V. Nevskii
Keyword(s):  
Carbon Fiber ◽  
Dynamic Load ◽  
Dynamic Compression ◽  
Concrete Strength ◽  
Concrete Columns ◽  
Carbon Composite ◽  
Fiber Reinforced Concrete ◽  
Design Calculation ◽  
Deformation Properties ◽  
Composite Reinforcement

Many new developments in the field of creating promising building materials relate to polymer fiber composites for reinforcing concrete constructions. The most effective use of such composites is provided by carbon fiber reinforcement. To date, the issues related to design, calculation and use of concrete constructions with carbon composite reinforcement under dynamic compressive loading have not been well studied. Purpose: The purpose of this study is to determine strength of dynamically loaded concrete constructions reinforced with carbon fiber using different methods of modification of deformation properties of concrete. Methodology: Experimental studies include testing two concrete columns with steel rod reinforcement and six concrete columns modified by carbon fiber and carbon composite reinforcement. The columns are tested under axial static and dynamic compressive loads. Research findings: The resulting longitudinal deformations of concrete and carbon-composite reinforcement and the limiting compressive force are determined. Value: New experimental data are obtained for the concrete column strength reinforced with carbon composite rods. The experimental results indicate the effective resistance to compression of carbon composite reinforcement. This phenomenon is observed in the case of carbon fiber and carbon composite reinforcement of compressed concrete constructions under the dynamic load. Practical implications: Resistance of carbon composite reinforcement to the dynamic compression affects the concrete strength, especially when its deformation properties are modified by carbon fiber and carbon composite reinforcement. The obtained results can be used in strength calculations of concrete constructions under the dynamic load. 

Research on Axial Compression Performance of Steel & Steel Pipe Reinforced Concrete Columns

2014 ◽  
Vol 584-586 ◽  
pp. 1313-1317
Author(s):  
Yun Yun Li ◽  
Bao Sheng Yang
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Concrete Strength ◽  
Concrete Columns ◽  
Steel Pipe ◽  
Shear Cracks ◽  
Working Mechanism ◽  
Factors Affecting ◽  
Composite Columns ◽  
Compression Performance

Through axial load bearing capacity test of eight steel & steel pipe reinforced concrete composite columns, the working mechanism, the ductility and the ultimate bearing capacity of the composite columns were studied, and the main factors affecting the performance of the composite columns are discussed, including concrete strength and the ferrule coefficient. The results show that the collaborative force of steel, steel pipe and concrete can effectively improve the bearing capacity of the columns, delay or inhibit the spread of oblique shear cracks in concrete and improve the ductility of the columns.

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