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Steel is often used as an assembly of main structure such as columns and beams on external walls of buildings. Such steel structural members lose their structural function when the temperature of the steel rises due to spouting hot gas or radiation heating via openings, such as windows, upon fire in a neighboring compartment. This paper presents a calculation model for predicting temperature properties of steel structural members upon fire heating and proposes it as a practical tool for evaluation of fire resistance. Establishing a model of three-dimensional heat flow analysis is focused on considering a heat flow toward an axis of a member. Spouting hot gas and radiation heating through openings are taken into consideration as a heat source upon modeling. Firstly, spouting hot gas properties and radiation heating through openings were formulated in order to model their heating impact on temperature of members. Then a model of three-dimensional heat flow analysis (the model of calculating temperature), involving these results as main components, was created. This model also helps the practical prediction of temperature properties of steel structural members that local heating brings about.

fire science and technology

A Three-Dimensional Heat Flow Analysis Model of Steel Structural Members upon Fire Exposure-Prediction of Temperature Properties of Exterior Steel Structural Members Exposed to Fire-