Fire Endurance Calculation for Wood Truss Structural Framing Systems: 2-Hour Assembly

There will be instances when materials and assemblies used in a building may not be readily available from prescriptive tables and tests. Theoretical methods have been developed that offer an alternative to full scale fire tests. One theoretical method known as the “Ten Rules of Fire Endurance Ratings” was published by T.Z. Harmathy in the May, 1965 edition of Fire Technology. Harmathy’s Rules provided a foundation for extending fire endurance assembly data and are used extensively in this report. The analysis in this research report used the method listed in IBC Section 703.3, method number 4, Engineering analysis.