A Method to Determine the Plastic Bending Angle of Dowel-Type Fasteners

Part of the RILEM Bookseries book series (RILEM, volume 9)

Abstract

In timber joints with dowel-type fasteners, the yield moment of the fastener is an important parameter. For fasteners of hardened steel, e.g. self-tapping screws, the yield moment cannot be calculated and has to be measured in a bending test as established in EN 409. The yield moment is defined at a plastic bending angle of α = 45°/d0.7. Therefore, the determination of the plastic bending angle is important to derive the characteristic yield moment of fasteners. For a proper derivation of the fastener’s yield moment, the onset of plastic deformations must hence be identified in order to be able to determine the correct plastic bending angle. A new method for the determination of the plastic bending angle was developed which is independent of a ductile or brittle behaviour of the fastener. The method is generally applicable to different fastener types with various diameters.

Keywords

dowel type fasteners yield moment self-tapping screws momentangle-curve plastic deformation 

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References

  1. 1.
    Blass, H.J., Bienhaus, A., Krämer, V.: Effective bending capacity of dowel-type fasteners. In: CIB-W18 Meeting 33, Paper 33-7-5, Delft, The Netherlands (2000)Google Scholar
  2. 2.
    CUAP, No 06.03/08: Self-tapping screws for use in timber constructions (2010)Google Scholar
  3. 3.
    EN12512, Timber structures - Test methods - Cyclic testing of joints made with mechanical fasteners (2001)Google Scholar
  4. 4.
    EN1995-1-1, Eurocode 5. Design of timber structures - Part 1-1: General - Common rules and rules for buildings (2004)Google Scholar
  5. 5.
    EN409, Timber structures - Test methods - Determination of the yield moment of dowel type fasteners (2009)Google Scholar

Copyright information

© RILEM 2014

Authors and Affiliations

  1. 1.Timber Structures and Building ConstructionKarlsruhe Institute of TechnologyKarlsruheGermany

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