Evaluation of Extended Wall OSB Sheathing Connection: Summary and Conclusions

Fig.2

Specimen used for research.

The new study, Evaluation of Extended Wall OSB Sheathing Connection under Combined Uplift and Shear Loading for 24-inch Heel Trusses, leaves us with the following conclusions:

This testing program was designed to further evaluate the performance of OSB wall sheathing panels extended over the roof heel in resisting combined uplift and shear forces. The results of this study provide guidance towards further expanding prescriptive solutions for high-heel truss attachment optimized for performance from the standpoint of structure, energy, and ease of construction. The following is a summary of the conclusions based on the results of this testing program:

  1. The tested system using extended wood structural panel as the primary connecting element (without additional connecting hardware) at the roof-to-wall interface of energy trusses can provide a continuous load path in both the shear and uplift directions and can be considered a viable option for residential construction in most areas of the country.
  2. The uplift-shear capacity interaction curve for the energy truss heel connection system is nonlinear, with capacities for all uplift to shear ratios measured in this testing program exceeding the capacities predicted based on a linear interaction. In design applications, a linear relationship may be a simplified and conservative representation of the response under combined loading for energy truss heel connection system using extended wood structural panel sheathing.
  3. The uplift-shear capacity interaction curve for the energy truss heel connection system is nonlinear, with capacities for all uplift to shear ratios measured in this testing program exceeding the capacities predicted based on a linear interaction. In design applications, a linear relationship may be a simplified and conservative representation of the response under combined loading for energy truss heel connection system using extended wood structural panel sheathing.