ANALYSIS OF THE STRESS-STRAIN STATE OF A FIRE-RESISTANT STEEL FLOOR BEAM

Abstract

he article presents an improved methodology for numerical modeling of steelstructural elements on the example of a floor beam, taking into account the influence of fire protection material. The article describes a step-by-stepmethodology for calculating fire resistance in LIRA-SAPR software, which shows in detail the principles of fire resistance analysis.This methodology takes into account the nonlinear dependence of changes in the main thermal and technical characteristics of materials, such as the coefficient of thermal conductivity, heat capacity and convective heat transfer, on temperature. The influence of fire protection deformation characteristics of structural elementswas analyzed.The article also describes the distribution of temperature fields over the elements of the experimental section and investigates the change in temperature and strength characteristics of the steel I-beam of the floor as a function of time. Several options for fire protection using materials from a Ukrainian manufacturer are proposed. Theeffectiveness of the above materials is numerically verified. The analysis results of different fire protection options are compared, which allows you to choose the most optimal option. The results of analysis with and without taking into account thenonlinearity of materials are also compared and described. In addition, the article investigates the role of the floor slab as a fire protection material.This makes it possible to determine the influence of the floor slab on the fire resistance of the structure and provide an additional level of safety.The article will be useful for design engineers who work with steel structures, as well as for researchers interested in the impact of fire protection materials on fire resistance. It provides valuable scientific and practical information that can be used to improve the safety and reliability of steel structures in fire-resistant environments.