Experimental Testing of Hold Down Devices for Timber Frame Shear Walls

https://research.thinkwood.com/en/permalink/catalogue401
Year of Publication
2012
Topic
Connections
Material
Light Frame (Lumber+Panels)
Application
Shear Walls
Author
Caprolu, Giuseppe
Organization
LuleƄ University of Technology
Year of Publication
2012
Format
Report
Material
Light Frame (Lumber+Panels)
Application
Shear Walls
Topic
Connections
Keywords
Hold-Down
Strength
Stiffness
Research Status
Complete
Summary
Källsner and Girhammar [1] have presented a new plastic design method for wood-framed shear walls at ultimate limit state. This method allows the designer to calculate the load-carrying capacity of partially anchored shear walls, where the leading stud is not anchored against uplift. In this report hold downs have been experimentally studied with respect to the strength and stiffness of the connection. Four different types of hold downs have been tested. The specimen was subjected to tension load applied to the stud. Four tests series are presented. Each series was divided into different sets according to the type of fastener used with the hold down device. The results show that the failure load is higher when hold downs with anchor bolts are used, up to ten times higher than the anchorage that uses only screws or nails. The failure mode vary with the type of hold down and the type of fasteners used. The tests showed three primary failure modes: failure of the stud when a bolt is used as the fastener between hold down device and stud, failure due to pull-out of the screws or nails from the rail and failure due to failure or pull-out of screws or nails from stud. Also, failure of the stud itself occurred in some tests caused by some defect of the timber.
Online Access
Free
Resource Link
Less detail