New Connection System for Confined Concrete Columns and Beams. II: Theoretical Modeling

2008 ◽  
Vol 134 (12) ◽  
pp. 1800-1809 ◽  
Author(s):  
Yu Bai ◽  
Jianguo Nie ◽  
C. S. Cai
Keyword(s):  
Concrete Columns ◽  
Theoretical Modeling ◽  
Confined Concrete ◽  
Connection System

scholarly journals Low-Cost Fiber Rope Reinforced Polymer (FRRP) Confinement of Square Columns with Different Corner Radii

Buildings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 355
Author(s):  
Qudeer Hussain ◽  
Anat Ruangrassamee ◽  
Somnuk Tangtermsirikul ◽  
Panuwat Joyklad ◽  
Anil C. Wijeyewickrema
Keyword(s):  
Ultimate Strength ◽  
Predictive Models ◽  
Axial Stress ◽  
Low Cost ◽  
Concrete Columns ◽  
Confined Concrete ◽  
Test Results ◽  
Stress Strain ◽  
Reinforced Polymer

This research investigates the behavior of square concrete columns externally wrapped by low-cost and easily available fiber rope reinforced polymer (FRRP) composites. This study mainly aims to explore the axial stress-strain relationships of FRRP-confined square columns. Another objective is to assess suitable predictive models for the ultimate strength and strain of FRRP-confined square columns. A total of 60 square concrete columns were cast, strengthened, and tested under compression. The parameters were the corner radii of square columns (0, 13, and 26 mm) and different materials of FRRP composites (polyester, hemp, and cotton FRRP composites). The strength and deformability of FRRP-confined specimens were observed to be higher than the unconfined specimens. It was observed that strength gains of FRRP-confined concrete columns and corner radii were directly proportional. The accuracy of ultimate strength and strain models developed for synthetic FRRP-confined square columns was assessed using the test results of this study, showing the need for the development of improved predictive models for FRRP-confined square columns. Newly developed unified models were found to be accurate in predicting the ultimate strength and strain of FRRP-confined columns.

Ductility of Spirally-Confined Concrete Columns

1981 ◽  
Vol 107 (1) ◽  
pp. 181-202
Author(s):  
M.J.N. Priestley ◽  
R. Park ◽  
R. T. Potangaroa
Keyword(s):  
Concrete Columns ◽  
Confined Concrete

scholarly journals Damage plasticity model for passively confined concrete

2019 ◽  
Vol 275 ◽  
pp. 02016
Author(s):  
Ben-ben Li ◽  
Hai-bei Xiong ◽  
Jia-fei Jiang ◽  
Yang Zhan
Keyword(s):  
Yield Stress ◽  
Concrete Columns ◽  
Confined Concrete ◽  
Flow Rule ◽  
Good Prediction ◽  
Plasticity Model ◽  
Dilation Angle ◽  
Good Prediction Accuracy ◽  
Concrete Damage ◽  
Concrete Damage Plasticity

This paper presents a modified concrete damage plasticity model (CDPM) for passively confined concrete within the concrete damage plasticity theory frame in ABAQUS. The modified CDPM can be used to simulate concrete under non-uniform passive confinement, for example, Fiber-reinforced polymer (FRP)-confined square concrete columns. The modification of CDPM includes a flow rule and a strain hardening/softening criterion in which dilation angle and yield stress are important parameters. Based on the true-triaxial experiment results of passively confined concrete, the dilation angle and yield stress were determined considering different confinement stiffness and non-uniform confinement stiffness ratio. Finally, the modified CDPM were incorporated in the ABAQUS model. The prediction of the finite element model of FRP-confined square concrete columns shows good prediction accuracy.

Strength model of FRP confined concrete columns based on analytical analysis and experimental test

2019 ◽  
Vol 11 (1) ◽  
pp. 82-106 ◽  
Author(s):  
Mahfoud Touhari ◽  
Ratiba Kettab Mitiche
Keyword(s):  
Concrete Strength ◽  
Compressive Force ◽  
Concrete Columns ◽  
Fiber Reinforced Concrete ◽  
Confined Concrete ◽  
Fiber Reinforced ◽  
Reinforced Concrete Column ◽  
Theoretical Assumption ◽  
Hoop Strain ◽  
Content Type

Purpose Covering a fiber-reinforced concrete column (fiber reinforced plastic (FRP)) improves the performance of the column primarily. The purpose of this paper is to investigate the behavior of small FRP concrete columns that are subject to axial pressure loading, in order to study the effect of many parameters on the effectiveness of FRP couplings on circular and square concrete columns. Design/methodology/approach These parameters include the shape of the browser (circular and square), whole core and cavity, square radius of square columns, concrete strength (low strength, normal and high), type of FRP (carbon and glass) and number of FRP (1–3) layers. The effective fibrillation failure strain was investigated and the effect of effective lateral occlusion pressure. Findings The results of the test showed that the FRP-coated columns improved significantly the final conditions of both the circular and square samples compared to the unrestricted columns; however, improvement of square samples was not as prominent as improvement in circular samples. The results indicated that many parameters significantly affected the behavior of FRP-confined columns. A new model for predicting compressive force and the corresponding strain of FRP is presented. A good relationship is obtained between the proposed equations and the current experimental results. Originality/value The average hoop strain in FRP wraps at rupture in FRP-confined concrete specimens can be much lower than that given by tensile coupon tests, meaning the theoretical assumption that the FRP-confined concrete cylinder ruptures when the FRP material tensile strength attained at its maximum is not suitable. Based on this observation, the effective peak strength and corresponding strain formula for FRP concrete confined columns must be based on the effective hoop rupture strain composite materials.

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