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Modeling and optimization of infill material properties of post-installed steel anchor bolt embedded in concrete subjected to impact loading

  • Saleem, Muhammad (Department of Mechanical and Energy Engineering, College of Engineering, Imam Abdulrahman Bin Faisal University)
  • Received : 2020.01.04
  • Accepted : 2021.12.07
  • Published : 2022.03.25
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Abstract

Steel anchor bolts are installed in concrete using a variety of methods. One of the most common methods of anchor bolt installation is using epoxy resin as an infill material injected into the drilled hole to act as a bonding material between the steel bolt and the surrounding concrete. Typical design standards assume uniform stress distribution along the length of the anchor bolt accompanied with single crack leading to pull-out failure. Experimental evidence has shown that the steel anchor bolts fail owing to the multiple failure patterns, hence these design assumptions are not realistic. In this regard, the presented research work details the analytical model that takes into consideration multiple micro cracks in the infill material induced via impact loading. The impact loading from the Schmidt hammer is used to evaluate the bond condition bond condition of anchor bolt and the epoxy material. The added advantage of the presented analytical model is that it is able to take into account the various type of end conditions of the anchor bolts such as bent or U-shaped anchors. Through sensitivity analysis the optimum stiffness and shear strength properties of the epoxy infill material is achieved, which have shown to achieve lower displacement coupled with reduced damage to the surrounding concrete. The accuracy of the presented model is confirmed by comparing the simulated deformational responses with the experimental evidence. From the comparison it was found that the model was successful in simulating the experimental results. The proposed model can be adopted by professionals interested in predicting and controlling the deformational response of anchor bolts.

Keywords

Acknowledgement

The author is grateful to the Deanship of Scientific Research (DSR) at Imam Abdulrahman Bin Faisal University, Kingdom of Saudi Arabia for the continued support and guidance. The publication is part of the project funded by the DSR-IAU under the project ID: 2020-158-ENG.

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