1.范围1。1总的来说，本标准涵盖了评估《加拿大国家建筑规范》第9部分中定义的用于住房和小型建筑的木屋架强度和变形性能的荷载试验程序。注:《加拿大国家建筑规范》第9部分规定了600米以下房屋和小型建筑施工的详细要求？在建筑区域和建筑中的3层中，除装配、机构和高危险工业外，所有占用均适用。1.2本标准未规定强制性性能标准（可接受的性能标准见附录A）。1.3试验意图本荷载试验程序旨在评估木屋架设计的充分性，而不是作为质量控制试验。 然而，在桁架质量存在争议的情况下，该程序可用于重新测试生产运行样品。注:必须采取措施确保桁架的生产质量，以持续生产本标准下可接受的设计。1.4限制本程序测试的组件限于:（a）最大跨度为12 m的三角桁架；或（b）最大跨度为4.3 m的弓弦桁架或透镜桁架；其构件通过机械连接器或钉住的gu sset板连接，且拟安装在中心最大间距为600 mm的位置，且安装方式应确保顶部弦杆适当覆盖或支撑，以防止侧向屈曲。

1. Scope1.1General 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 m? in building area and 3 storeys in building he ight and applies to all occupancies except assembly, institutional, and high-hazard industrial.1.2This Standard does not stipulate mandatory performance criteria (see Appendix A for acceptable performance criteria).1.3Intent 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.1.4Limitations 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.