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Materials 2017, 10(8), 917;

Modeling Adhesive Anchors in a Discrete Element Framework

Christian Doppler Laboratory LiCRoFast, Department of Civil Engineering and Natural Hazards, University of Natural Resources and Life Sciences (BOKU), 1190 Vienna, Austria
Department of Mechanics, Faculty of Civil Engineering, Czech Technical University in Prague, 16629 Prague, Czech Republic
Author to whom correspondence should be addressed.
Received: 27 June 2017 / Revised: 20 July 2017 / Accepted: 2 August 2017 / Published: 8 August 2017
(This article belongs to the Section Structure Analysis and Characterization)
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In recent years, post-installed anchors are widely used to connect structural members and to fix appliances to load-bearing elements. A bonded anchor typically denotes a threaded bar placed into a borehole filled with adhesive mortar. The high complexity of the problem, owing to the multiple materials and failure mechanisms involved, requires a numerical support for the experimental investigation. A reliable model able to reproduce a system’s short-term behavior is needed before the development of a more complex framework for the subsequent investigation of the lifetime of fasteners subjected to various deterioration processes can commence. The focus of this contribution is the development and validation of such a model for bonded anchors under pure tension load. Compression, modulus, fracture and splitting tests are performed on standard concrete specimens. These serve for the calibration and validation of the concrete constitutive model. The behavior of the adhesive mortar layer is modeled with a stress-slip law, calibrated on a set of confined pull-out tests. The model validation is performed on tests with different configurations comparing load-displacement curves, crack patterns and concrete cone shapes. A model sensitivity analysis and the evaluation of the bond stress and slippage along the anchor complete the study. View Full-Text
Keywords: bonded anchors; discrete elements; fastenings; bond-slip law; combined failure; photogrammetry bonded anchors; discrete elements; fastenings; bond-slip law; combined failure; photogrammetry

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Marcon, M.; Vorel, J.; Ninčević, K.; Wan-Wendner, R. Modeling Adhesive Anchors in a Discrete Element Framework. Materials 2017, 10, 917.

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