Experimental investigations and design provisions of steel-to-timber joints with annular-ringed shank nails for Cross-Laminated Timber structures

Published Date
30 September 2016, Vol.122:446–457, doi:10.1016/j.conbuildmat.2016.06.072

Author 

Matteo Izzi ^a,b,,

Georg Flatscher ^c,

Massimo Fragiacomo ^d,

Gerhard Schickhofer ^c,

aDepartment of Engineering and Architecture, University of Trieste, Piazzale Europa 1, 34127 Trieste, Italy

bNational Research Council of Italy – Trees and Timber Institute (CNR IVALSA), Via Biasi 75, 38010 San Michele all’Adige, Italy

cInstitute of Timber Engineering and Wood Technology, Graz University of Technology, Inffeldgasse 24/1, 8010 Graz, Austria

dDepartment of Civil, Construction-Architectural and Environmental Engineering, University of L’Aquila, Via Gronchi 18, 67100 L’Aquila, Italy

Received 8 January 2016. Revised 3 June 2016. Accepted 14 June 2016. Available online 9 July 2016.

Highlights

• •
  An experimental programme is carried out on nailed steel-to-timber joints in CLT.
• •
  Average and characteristic values of the strength capacities are evaluated.
• •
  Results are compared with the models given in current design codes and literature.
• •
  The overstrength factor   and the strength degradation factor   are calculated.
• •
  Conservative values of   and   are provided.

Abstract 

This paper investigates the mechanical and the hysteretic behaviour of steel-to-timber joints with annular-ringed shank nails in Cross-Laminated Timber (CLT). These fasteners are used to anchor typical metal connectors, such as hold-downs and angle brackets, to the CLT panels. The experimental programme presented in the paper was carried out at the Institute of Timber Engineering and Wood Technology, Graz University of Technology (Graz, Austria). Average and characteristic values of the experimental strength capacities are evaluated and compared to the analytical predictions determined according to current structural design codes and literature. Furthermore, to fulfil the requirements of the capacity-based design, the overstrength factor and the strength degradation factor are evaluated and conservative values are recommended.

Keywords

Annular-ringed shank nail

Steel-to-timber joint

Cross-Laminated Timber

Hysteretic behaviour

Calculation model

Capacity-based design

Overstrength factor

Strength degradation factor

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• ⁎ 
  Corresponding author at: Department of Engineering and Architecture, University of Trieste, Piazzale Europa 1, 34127 Trieste, Italy.

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http://www.sciencedirect.com/science/article/pii/S0143749615002377