Structural Performance of Light-Frame Roof Assemblies: 1. Truss Assemblies with High Truss Stiffness Variability

摘要

The first report of a three-part series that covers results of a full-scale roof assemblies research program. The focus of the report is the structural performance of truss assemblies comprising trusses with abnormally high stiffness variability and critical joint strength. Results discussed include properties of truss members and connections, individual truss stiffness and strength, and the structural performance of two full-scale truss roof assemblies. Findings support the use of linear models to predict the behavior of trusses used in residential roof assemblies, linear superposition models to characterize assembly load disbursement, and use of a load sharing increase factor to adjust individual truss load capacity when used in a repetitive member assembly.