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Computers and Concrete Volume 22, Number 4, October 2018 , pages 395-405 DOI: https://doi.org/10.12989/cac.2018.22.4.395 |
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Numerical simulations of progression of damage in concrete embedded chemical anchors |
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S. Sasmal, R. Thiyagarajan, K.H. Lieberum and E.A.B. Koenders
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| Abstract | ||
| In this paper, the performance of post-installed adhesive bonded anchor embedded in concrete is assessed using numerical simulations. This study aims at studying the influence of parameters on the performance of a chemically bonded anchorage system. Non-linear finite element modelling and simulations are carried out by properly using the material properties and phenomenon. Materials parameters such as characteristic length, fracture energy, damage criteria, tension retention and crack width of concrete and interface characteristics are carefully assigned so as to obtain a most realistic behaviour of the chemical anchor system. The peak strength of two different anchor systems obtained from present numerical studies is validated against experimental results. Furthermore, validated numerical models are used to study the load transferring mechanism and damage progression characteristics of various anchors systems where strength of concrete, strength of epoxy, and geometry and disposition of anchors are the parameters. The process of development of strain in concrete adjacent to the anchor and energy dissipated during the course of damage progression are analysed. Results show that the performance of the considered anchorage system is, though a combined effect of material and geometric parameters, but a clear distinction could be made on the parameters to achieve a desired performance based on strength, slip, strain development or dissipated energy. Inspite the increase in anchor capacity with increase in concrete strength, it brings some undesirable performance as well. Furthermore, the pullout capacity of the chemical anchor system increases with a decrease in disparity among the strength of concrete and epoxy. | ||
| Key Words | ||
| concrete damage; fracture energy; pull-out strength; chemically bonded; non-linear simulation; damage process; interface behaviour | ||
| Address | ||
| S. Sasmal and R. Thiyagarajan: CSIR-Structural Engineering Research Centre, CSIR Campus, Taramani, Chennai-600113, India K.H. Lieberum and E.A.B. Koenders: Institute of Construction and Building Materials, Technische Universität Darmstadt, Darmstadt, Germany | ||