Computers and Concrete

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Numerical investigation on RC T-beams strengthened in the negative moment region using NSM FRP rods at various depth of embedment

  • Haryanto, Yanuar (Department of Civil Engineering, College of Engineering, National Cheng Kung University) ;
  • Hu, Hsuan-Teh (Department of Civil Engineering, College of Engineering, National Cheng Kung University) ;
  • Han, Ay L. (Department of Civil Engineering, Faculty of Engineering, Universitas Diponegoro) ;
  • Hsiao, Fu-Pei (Department of Civil Engineering, College of Engineering, National Cheng Kung University) ;
  • Teng, Charng-Jen (Department of Civil Engineering, College of Engineering, National Cheng Kung University) ;
  • Hidayat, Banu A. (Department of Civil Engineering, College of Engineering, National Cheng Kung University) ;
  • Nugroho, Laurencius (Department of Civil Engineering, College of Engineering, National Cheng Kung University)
  • Received : 2020.10.22
  • Accepted : 2021.09.14
  • Published : 2021.10.25
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Abstract

The application of Near Surface Mounted (NSM) method to strengthen reinforced concrete (RC) members in flexure through the use of Fiber Reinforced Polymer (FRP) rods has become a subject of interest to designers and researchers over the past few years. This technique has been extensively applied, and there is still a need for more experiments, analytical, and numerical studies to determine the effects of their parameters on the flexural performance of RC members. Therefore, a detailed 3D nonlinear finite element (FE) numerical model was developed in this study to predict the load-carrying capacity and the response of RC T-beams strengthened in the negative moment region accurately through the use of NSM FRP rods at different depth of embedment which are placed under three-point bending loading. The model was, however, designed with due consideration for the nonlinear constitutive material properties of concrete, yielding of steel reinforcement, NSM rods, and cohesive behaviors to simulate the contact between two neighboring materials. Moreover, the findings of the numerical simulations were compared with those from the experiments by other investigators which involve two specimens strengthened with NSM FRP rods added to one unstrengthened control specimen. The results, however, showed that the mid-span deflection responses of the predicted FE were in line with the corresponding data from the experiment for all the flexural loading stages. This was followed by the use of the validated FE models to analyze the effect of several properties of the FRP materials to provide more information than the limited experimental data available. It was discovered that the FE model developed is appropriate to be applied practically and economically with more focus on the parametric studies based on design to precisely model and analyze flexural negative moment strengthening for the RC members through the use of NSM FRP rods.

Keywords

Acknowledgement

The fund for this study was provided by the Ministry of Science and Technology, Taiwan (R.O.C) under grant number MOST-108-2625-M-006-006. The first author acknowledges the support of the Ministry of Education, Taiwan (R.O.C) through the provision of the Elite Scholarship as well as the support of the CTCI Foundation Science and Technology Scholarship in the form of the Research Scholarship for International Graduate Students.

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