This standard establishes the procedure for conducting destructive tests on nail-jointed timber trusses to determine their ultimate load-carrying capacity, deflection characteristics, and modes of failure.
Method of test for nail-jointed timber trusses, Part I: Destructive test
Quick Reference Values
Deflection measurement accuracy0.01 mm
Moisture content reading accuracy1 percent
Typical load incrementFractional increments of the design load (e.g., 20% to 25%)
Practical Notes
Sufficient lateral support must be provided during the test to simulate actual roof conditions and prevent premature out-of-plane buckling.
The moisture content of the timber at the time of testing significantly affects strength and must be recorded accurately.
Test loads should be applied directly at the nodal points to accurately mimic the transfer of purlin loads.