Design equations for axially loaded reinforced concrete columns strengthened with fibre reinforced polymer wraps

2000 ◽  
Vol 27 (5) ◽  
pp. 1011-1020 ◽  
Author(s):  
Michèle Thériault ◽  
Kenneth W Neale
Keyword(s):  
Reinforced Concrete ◽  
Load Capacity ◽  
Axial Loading ◽  
Concrete Columns ◽  
Experimental Investigations ◽  
Reinforced Concrete Columns ◽  
Reinforced Polymer ◽  
Axial Load Capacity ◽  
Fibre Reinforced Polymer ◽  
Future Work

Step-by-step design procedures are proposed for the axial load capacity enhancement of circular and rectangular reinforced concrete columns confined with fibre reinforced polymer (FRP) wraps. The design methods are intended for practicing engineers in that they are relatively simple to apply and are made readily available in a design code format. Commentaries are presented to explain the design philosophy and rationale leading to the various design equations. For purposes of validation, numerical results based on the proposed design equations are compared against available experimental data. Strengthening limits, as governed by creep and fatigue phenomena, are also proposed. Whenever test data are found to be too limited, conservative approaches are adopted. Various experimental investigations are suggested for future work to further validate and update the design equations.Key words: FRP strengthening, concrete columns, axial loading, confinement, design.

scholarly journals Numerical parametric studies on the fire endurance of fibre-reinforced-polymer-confined concrete columns

2004 ◽  
Vol 31 (6) ◽  
pp. 1090-1100 ◽  
Author(s):  
L A Bisby ◽  
V KR Kodur ◽  
M F Green
Keyword(s):  
Reinforced Concrete ◽  
Holistic Approach ◽  
Concrete Columns ◽  
Reinforced Concrete Columns ◽  
Reinforced Polymer ◽  
Fire Endurance ◽  
Fibre Reinforced Polymer ◽  
Parametric Studies ◽  
Parking Garages ◽  
Promising Application

Confinement of reinforced concrete columns by circumferential fibre reinforced polymer (FRP) wraps is a promising application of FRP materials for structural strengthening and seismic upgrading of deteriorated or under-strength members. However, if this technique is to be used in buildings, parking garages, and industrial structures, then the ability of FRP materials and FRP-wrapped columns to withstand the effects of fire must be demonstrated and evaluated. This paper presents the results of parametric studies conducted using a previously presented and partially validated numerical fire simulation model to investigate the effects of a number of parameters on the fire behaviour of FRP-wrapped reinforced concrete columns. It is demonstrated that appropriately designed and adequately protected FRP-wrapped reinforced concrete columns are capable of achieving fire endurances equivalent to conventionally reinforced concrete columns. Furthermore, this study also suggests that a holistic approach to the fire design of FRP-wrapped members is required, rather than an approach based on the specific performance of the FRP materials. Design recommendations for the fire-safe design of FRP-wrapped concrete columns are presented and discussed.Key words: reinforced concrete, rehabilitation, strengthening, fibre reinforced polymer, fire endurance, fire insulation, numerical modelling.

scholarly journals Numerical Analysis of Strength Capacity of High-Performance Reinforced Concrete Columns with Varied Parametric Study

2020 ◽  
Vol 14 (1) ◽  
pp. 141-151
Author(s):  
Hadi N. G. Al-Maliki
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
Load Capacity ◽  
Axial Loading ◽  
Concrete Columns ◽  
Reinforced Concrete Columns ◽  
Strength Capacity ◽  
The Moment

Introduction: This study includes the analysis of the strength capacity of high performance reinforced concrete columns subjected to concentric axial loading. The main variables are based on the compressive strength of concrete and steel reinforcing ratios. All the columns are fixed, supported by two ends. Methods: This study is based on a calculation done according to ACI Code-318M-2011 equations for columns analysis to evaluate the ultimate strength then applied these load on samples to compare between them by software program Prokon V.3. The comparison is based on reinforcement ratio and moment resistance capacity. Results: The analysis results show that when increasing the main reinforcement with high-performance concrete led, there will be an increased load capacity by about (40 to 215%) and moment resistance capacity by about (35 to 50%) with the same load conditions. According to the analysis of the results, the moment resistance capacity of constant sample value with different reinforcing ratio leads to these resist depending on the load applied, and the concrete compressive strength of columns. Conclusion: Reasonable correlation of the results is demonstrated, which ensured the adequacy of the analysis by test program, both hand calculation and software Prokon.V.3.

Accelerated corrosion and repair of reinforced concrete columns using carbon fibre reinforced polymer sheets

2000 ◽  
Vol 27 (5) ◽  
pp. 941-948 ◽  
Author(s):  
C Lee ◽  
J F Bonacci ◽  
M DA Thomas ◽  
M Maalej ◽  
S Khajehpour ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fibre ◽  
Concrete Columns ◽  
Corrosion Monitoring ◽  
Reinforced Concrete Columns ◽  
Accelerated Corrosion ◽  
Cfrp Sheets ◽  
Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer

An experimental study on the simulation of corrosion in large-scale reinforced concrete columns and their repair using carbon fibre reinforced polymer (CFRP) sheets is presented. Seven columns were subjected to an accelerated corrosion regime, wrapped using CFRP sheets, then tested to structural failure and (or) subjected to further post-repair accelerated corrosion, monitoring, and testing. Accelerated corrosion was achieved by adding sodium chloride to the mixing water, applying a current to the reinforcement cage, and subjecting the specimens to cyclic wetting and drying. Results showed that the CFRP repair greatly improved the strength of the repaired member and retarded the rate of post-repair corrosion. Moreover, subjecting the repaired column to extensive, post-repair corrosion resulted in no loss of strength or stiffness and only a slight reduction in the ductility of the repaired member.Key words: accelerated corrosion, carbon fibre reinforced polymer, composites, corrosion damage, corrosion rate, external confinement, reinforced concrete columns.

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