Abstract
This paper presents a finite element (FE) analysis for predicting the flexural behavior of reinforced concrete (RC) beams strengthened with Fe-based shape memory alloy (Fe-SMA) strips using a near surface mounted (NSM) method. Experimental results reported in the literature were used to verify the proposed FE model. FE analyses were conducted using OpenSees, a general-purpose structural FE analysis program. The RC beam specimens were modeled using a nonlinear beam-column element and a fiber element. The Concrete 02 model, Steel 01 model, and Pinching 04 model were applied to the concrete, steel reinforcement, and Fe-SMA strip in the fiber element, respectively, and the FE analysis was carried out in a displacement control method based on the Newton-Raphson method. The FE model of this study accurately predicted the initial crack load, yield load, and ultimate load. From parametric analyses, it was concluded that an increase in the compressive strength of the concrete increases the ductility of the specimen, and an increase in the level of recovery stress on the Fe-SMA strip increases the initial stiffness of the specimen.
Highlights
Reinforced concrete (RC) is one of the most commonly used construction materials in modern society
Abouali et al [20] performed a numerical study to predict the behavior of RC beams strengthened with Fe-based shape memory alloy (Fe-shape memory alloy (SMA)) using the near surface mounted (NSM) method using ABAQUS, and three-dimensional solid elements were used for modeling
In this study, a simple finite element (FE) model for predicting the flexural performance of the RC beam strengthened with Fe-SMA using the NSM method is proposed, and its reliability is verified by comparing numerical results with the experimental results of a previous studies
Summary
Reinforced concrete (RC) is one of the most commonly used construction materials in modern society. Hong et al [18] conducted an experimental study to evaluate the flexural performance of RC beams strengthened with the Fe-SMA using the NSM method They reported that the crack load and initial stiffness of the RC beams with activated Fe-SMA strips were significantly improved compared to those with deactivated Fe-SMA strips, due to the prestressing effect. Abouali et al [20] performed a numerical study to predict the behavior of RC beams strengthened with Fe-SMA using the NSM method using ABAQUS, and three-dimensional solid elements were used for modeling. They reported that the proposed numerical model showed a well fitted load-displacement relationship with the experimental results. In this study, a simple FE model for predicting the flexural performance of the RC beam strengthened with Fe-SMA using the NSM method is proposed, and its reliability is verified by comparing numerical results with the experimental results of a previous studies
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