This Standard covers the load test procedure for evaluating the strength and deformation performance of wood roof trusses intended for use in housing and small buildings as defined in Part 9 of the National Building Code of Canada.
Note: Part 9 of the National Building Code of Canada provides detailed requirements for the construction of houses and small buildings up to 600 m² in building area and 3 storeys in building he ight and applies to all occupancies except assembly, institutional, and high-hazard industrial.
1.2 This Standard does not stipulate mandatory performance criteria (see Appendix A for acceptable performance criteria).
1.3 Intent of Test
This load test procedure is intended to evaluate the adequacy of wood roof truss designs and is not intended as a quality control test. The procedure may, however, be used for retesting production run samples in cases where the quality of the truss is in dispute.
Note: It is recognized that measures to ensure the quality of production of trusses must be maintained for on-going production of designs acceptable under this Standard.
Assemblies to be tested by this procedure are limited to:
(a) Triangulated trusses having a maximum span of 12 m; or
(b) Bowstring or lenticular trusses having a maximum span of 4.3 m; whose members are connected using mechanical connectors or nailed gu sset plates and which are intended to be installed at a maximum spacing of 600 mm on centres and in such a manner that the top chords are suitably sheathed or braced to prevent lateral buckling.
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Load Test Procedure for Wood Roof Trusses for Houses and Small Buildings
Mode opératoire de l'essai statique des fermes de toit en bois pour les maisons et petits bâtiments