- Author
- Lim, K. Y. S. | King, A. B.
- Title
- Fire Performance of Protected Nail-On Gusset Connections for Loaded Glulam Members.
- Coporate
- Building Research Institute, Ibaraki-Ken, Japan
- Report
- BRANZ No. 91
- Book or Conf
- Pacific Timber Engineering Conference, 2nd. August 28-31, 1989, Auckland, New Zealand, 119-124 p., 1989
- Keywords
- timber | fire resistance tests | plywood | steels | fire resistance rating | gypsum | intumescent coatings
- Abstract
- The fire performance of heavy glulam timber members based on the 'sacrificial method of char' is widely accepted. The performance of their mecahnical connectors, possibly the weakest link, is frequently overlooked. This paper describes the experimental testing of six full-size nail-on gusset connections between glulam timber members when subjected to the ISO 834 (1975) fire resistance test. The parameters examined included different gusset types, different protection methods, beams of two depths and two levels of applied load. The results of this study indicated that protected nail-on plywood or steel gusset connections can achieve a one hour fire resistance rating (FRR). Protection using two layers of a gypsum "control board" proved to be more than adequate with a single layer achieving the one hour FRR. The degree of protection offered by an intumescent paint coating on the steel gussets was inconclusive.