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Analysis of Retrofitted Concrete Columns using 3D Elastic-Plastic Modeling


Analysis of Retrofitted Concrete Columns using 3D Elastic-Plastic Modeling

Al-Maadhidi, Zaineb (2021) Analysis of Retrofitted Concrete Columns using 3D Elastic-Plastic Modeling. Masters thesis, Concordia University.

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Fiber Reinforced Polymer (FRP) jacketing is frequently used to enhance the performance of concrete columns. The strength and ductility of a concrete column increase after FRP jacketing mainly because of concrete’s improved behaviour under confinement. To achieve a reliable retrofit design, engineers often need to understand how much the performance is improved after FRP jacketing. For that purpose, numerical modelling is often necessary. Phenomenological elastic-plastic models are widely used for the numerical modelling of concrete because of their capability of representing 3D concrete behaviour considering permanent inelastic deformations. This research aims to implement an elastic-plastic model to simulate FRP-jacketed concrete columns. The 3D material model is validated against existing experimental data and comparisons with the results of models developed in ABAQUS software. It is shown that the proposed modelling approach is capable of providing an accurate behaviour of square concrete columns confined with reinforcements and FRP jackets under compression. After the validation of the model, a parametric study is conducted to illustrate the consequence of partial wrapping on the behaviour of retrofitted square concrete columns and to test the effect of FRP and concrete properties on the confined concrete strain. The obtained results from the parametric study are then used to acquire a suitable confined concrete strain equation/formula using a nonlinear regression technique. The core of this technique is based on an optimization method that finds the optimal coefficients for the proposed equation, helping in choosing the equation with the best fitting performance to the confined strain that is gained from the 3D material model. This proposed equation is recommended to improve the Canadian Standards by describing the impact of material properties on the confined concrete strain.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Building, Civil and Environmental Engineering
Item Type:Thesis (Masters)
Authors:Al-Maadhidi, Zaineb
Institution:Concordia University
Degree Name:M.A. Sc.
Program:Civil Engineering
Date:1 October 2021
Thesis Supervisor(s):Erkmen, Emre
Keywords:Numerical Modeling, Retrofitted concrete columns, FRP, Finite Element Modeling, Elastic-Plastic Model, Nonlinear regression.
ID Code:989907
Deposited By: Zaineb Al Maadhidi
Deposited On:16 Jun 2022 14:21
Last Modified:16 Jun 2022 14:21


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