This paper is to verify the fire resistance of beams made from fire-resistant(FR) structural steel by means of a full-scale loaded heat test. Because of the elements contained, FR Steel has higher strength than conventional structural steel at elevated temperatures. Its 0.2% proof stress at 600°C is equal to or greater than two-thirds the value specified at room temperature. Rockwool, ceramic fire protection, and foaming-type intumescent coating were used as fire-protection materials. The results showed that the fire-protection thickness can be reduced below what is required for conventional steel beams and that 1-h fire resistance can be obtained by intumescent coating with a lower insulation property.
A model for predicting a room fire in the fully developed stage is developed for the purpose of estimating the heat release due to the combustion of excess fuels in external flames projecting from the windows of the fire room. In this model, the burning rate is calculated as a function of the predicted heat transfer to the fuel. The model does not need to introduce adjusting factors, such as the "rate of perfect combustion (=0.6)" by Kawagoe et al., to obtain reasonably good predictions of room fire temperatures. The predictions of the temperatures and the burning rates are compared with the results of preceding experiments and are found to have reasonable agreement.
Simple predictive equations for the room fire behavior were proposed. These were obtained by applying simple predictive method for pre-flashover compartment fire temperature proposed by McCaffrey et al. to ventilation controlled fire. These equations can easily predict the temperature inside the compartment, the rate of heat loss due to ventilation and the rate of heat loss to compartment boundary. These can be used when the room fire is ventilation controlled regime. The results of the prediction using the simple equations were compared with the results of a more detailed computer model. Through this comparison, it was confirmed that these simple predictive equations are practical useful to estimate ventilation controlled compartment fire behavior, even though there is a little error caused by neglecting heat loss by radiation through the openings.
The paper presents a sample design of a multi-storey building with respect to the fire safety. Three design strategies are examined, a standard solution according to the requirements, a fire safety engineering design without a sprinkler system and finally a fire safety engineering design with a sprinkler system. The objective was to demonstrate different design strategies and still comply with the performance based Swedish building regulation. Mostly, only the safety to people has been considered in the design for the three cases. The use of fire safety engineering methods for the design shows that an optimised solution can be achieved with respect to both fire safety and economics.
A pilot case study was carried out to examine the feasibility of a performance based fire safety design system to be developed in Japan. This system intends to give more degree of freedom in fire safety design than the method prescribed in current building standards law of Japan. In place of prescriptive solutions, a hierarchy of objectives/ functional requirements/ performance requirements was defined by a pair of design fire condition (input) and acceptable conditions (output). The critical values were selected so that the current prescriptive requirement would satisfy the criteria without too much redundancy. In this way, the system can derive many alternative design solutions without changing the absolute level of safety. As a first pilot case study, the system was applied to an four-storied multi-tenant office buildings. The study was carried out for control of fire spread and life safety verification.