Self-tapping screws and threaded rods as reinforcement for structural timber elements – A state-of-the-art report

Published Date
30 October 2015, Vol.97:78–89, doi:10.1016/j.conbuildmat.2015.04.028
Special Issue: Reinforcement of Timber Structures

Author 

Philipp Dietsch ^a,,

Reinhard Brandner ^b,

aChair of Timber Structures and Building Construction, Technische Universität München, Germany

bInstitute of Timber Engineering and Wood Technology, Graz University of Technology, Austria

Received 6 January 2015. Revised 9 April 2015. Accepted 11 April 2015. Available online 8 May 2015.

Highlights

• Description of advantages of self-tapping screws as reinforcing elements.
• •
  Description of state-of-the-art in application and design approaches.
• •
  Extensive background information for all approaches described.
• •
  Results of German background literature summarized in English.

Author

In timber engineering, self-tapping screws, optimized primarily for axial loading, represent the state-of-the-art in fastener and reinforcement technology. Their economic advantages and comparatively easy handling make them one of the first choices for application in both domains. This paper focuses on self-tapping screws and threaded rods applied as reinforcement, illustrating the state-of-the-art in application and design approaches in Europe, in conjunction with numerous references for background information. With regard to medium to large span timber structures which are predominately erected by using linear timber members, from e.g. glued laminated timber, the focus of this paper is on their reinforcement against stresses perpendicular to grain as well as shear. However, latest findings with respect to cross laminated timber are included as well.

Keywords

Self-tapping screws

Rods

Reinforcement

Glued laminated timber

Cross laminated timber

Stresses perpendicular to the grain

Shear stresses

---

Fig. 1.

Fig. 2.

Fig. 3.

 Table 1

Table 1.

Fig. 4.

Fig. 5.

Fig. 6.

Fig. 7.

Fig. 8.

Fig. 9.

Fig. 10.

Fig. 11.

Fig. 12.

Fig. 13.

Fig. 14.

Fig. 15.

Fig. 16.

• ⁎ 
  Corresponding author.
  
  

For further details log on website :
http://www.sciencedirect.com/science/article/pii/S0950061815004717