Experimental and Numerical Investigations of Punching Shear Behavior of FRCM-Strengthened Two-Way RC Slabs
Publication: Journal of Composites for Construction
Volume 27, Issue 1
Abstract
Fabric-reinforced cementitious matrix (FRCM) composites have been widely studied as they constitute an alternative solution to fiber-reinforced polymer (FRP) retrofitting solutions for steel-reinforced concrete (RC) members. This study investigated the punching shear behavior of RC slabs strengthened with FRCM composites. Different tests were first performed to determine the tensile behavior of the FRCM and the interfacial bond behavior between the FRCM and concrete substrates. These tests were used as input parameters for a three-dimensional (3D) finite-element model (FEM) for RC slabs strengthened with the FRCM under shear. Subsequently, one reference slab and two strengthened slab specimens with dimensions of 1,600 mm × 1,600 mm × 100 mm were tested under punching shear. The test results demonstrate the effectiveness of FRCM strengthening under punching shear. An automation parameter calibration process was developed to identify the input parameters of Mazars’ concrete behavior law used in the 3D FEM model. The results of the numerical investigation can predict the punching shear behavior of reinforced concrete slabs with reasonable accuracy.
Practical Applications
There are relatively limited studies conducted on the two-way RC slabs compared with those related to RC beams, walls, or one-way slabs strengthened with fabric-reinforced cementitious matrix (FRCM) composites. The test results on the tensile behavior of the FRCM, the failure mode, and the effectiveness of the strengthening system could be referred to and consulted in future research on this aspect. A nonlinear finite-element method considering a macroscopic approach for the FRCM layer was performed to predict the behavior of RC slabs. A coupling MATLAB-Cast3M process using the fmincon function on Matlab was developed to calibrate the numerical model’s input parameters. This automation process can be used for other research and engineering applications as it is easy to implement on Matlab or Python. A parametric study was conducted to determine the effects of four factors on the shear strength and ductility of the two-way slabs, namely concrete tensile strength, concrete residual tensile strength, slab thickness, and the number of FRCM layers. Other researchers could use these results for experimental design or numerical simulation processes. Based on the experimental results, it was possible to show that the activation of the dowel effect mechanism can increase the bearing capacity and potentially provide ductility. On this aspect, a more substantial experiment should be conducted.
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Acknowledgments
This research was funded by the Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant Number 107.01-2017.03. The following contributions were made by each author: Dr. Khuong Le-Nguyen: Experimental investigation, Analysis, Conceptualization, Methodology, Validation, Supervision, Writing – review and editing, and Project Administration; Pr. Xuan-Huy Nguyen: Conceptualization, Analysis, and Resources; Dr. Huy-Cuong Nguyen: Experimental investigation and analysis; Mr. Minh-Quyen CAO: Experimental investigation; Pr. Amir Si-Larbi: Methodology and Analysis; Pr. Zakaria Ilyes Djamai: Methodology, Validation, Supervision, Writing – review and editing, and Project Administration.
Notation
The following symbols are used in this paper:
- d
- effective damage parameter;
- Ec
- modulus of elasticity of concrete;
- Es
- modulus of elasticity of reinforcement;
- fc
- average compressive strength of concrete;
- fct
- tensile strength of concrete;
- fRi
- residual tensile strengths;
- fy
- yield strength of reinforcement;
- h
- slab thickness;
- k
- matrix stiffness;
- r
- triaxiality factor;
- Y
- thermodynamic variable;
- ɛt
- equivalement strain for cracking; and
- ɛc
- equivalement strain for crushing.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 27 • Issue 1 • February 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jan 24, 2022
Accepted: Aug 30, 2022
Published online: Nov 3, 2022
Published in print: Feb 1, 2023
Discussion open until: Apr 3, 2023
ASCE Technical Topics:
- Concrete
- Concrete slabs
- Engineering fundamentals
- Engineering materials (by type)
- Fiber reinforced concrete
- Finite element method
- Material mechanics
- Material properties
- Materials engineering
- Methodology (by type)
- Models (by type)
- Numerical methods
- Punching shear
- Reinforced concrete
- Shear strength
- Shear stress
- Slabs
- Strength of materials
- Stress (by type)
- Structural analysis
- Structural engineering
- Structural members
- Structural systems
- Three-dimensional models
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