Author(s)

B. Kasal

Abstract

Fire damage of wood structures has always been a concern of an engineering community. Advances in chemistry allow to apply fire retardants to wood members which inhibit the fire spread. However, the chemicals may have an adverse effect on the strength of wood mainly if the members are subjected to elevated temperatures. This is frequently the case in roofs where temperatures above 50° C are not exceptional. This paper describes the change in modulus of elasticity and strength of wood truss members treated by a fire retardant and subjected to elevated temperatures during service. Significant reduction in bending strength and modulus of elasticity was found. However, the compressive strength along fibers was not affected. Introduction Large number of historical buildings is entirely or partially built

Keywords