Fracture Mechanics Models for Brittle Failure of Bottom Rails due to Uplift in Timber Frame Shear WallsReportar como inadecuado

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Advances in Civil Engineering - Volume 2016 2016, Article ID 9402650, 21 pages -

Research ArticleDivision of Wood Science and Engineering, Luleå University of Technology, 931 87 Skellefteå, Sweden

Received 21 May 2016; Accepted 17 July 2016

Academic Editor: John Mander

Copyright © 2016 Joergen L. Jensen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In partially anchored timber frame shear walls, hold-down devices are not provided; hence the uplift forces are transferred by the fasteners of the sheathing-to-framing joints into the bottom rail and via anchor bolts from the bottom rail into the foundation. Since the force in the anchor bolts and the sheathing-to-framing joints do not act in the same vertical plane, the bottom rail is subjected to tensile stresses perpendicular to the grain and splitting of the bottom rail may occur. This paper presents simple analytical models based on fracture mechanics for the analysis of such bottom rails. An existing model is reviewed and several alternative models are derived and compared qualitatively and with experimental data. It is concluded that several of the fracture mechanics models lead to failure load predictions which seem in sufficiently good agreement with the experimental results to justify their application in practical design.

Autor: Joergen L. Jensen, Giuseppe Caprolu, and Ulf Arne Girhammar



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