Abstract. In this article, the authors conducted a study of the stress-strain and temperature state of the steel frame of the building.Verification analysis of steel section for fire resistance in the homeland software package is carried out.The obtained results were compared with the results of a similar analysis in a foreign software package.The analysis of the dynamic problem of thermal conductivity of the cross section of the beam is carried out.The basic equations for solving the boundary problem of nonstationary thermal conductivity are given.Also, the algorithm of realization of analysis of temperature deformations on section of a steel beam by finite element method is given.The process of designing analytical model of structural elements and analysis of the stress-strain state when operating temperature is changed is considered.The analysis of kinematic and static characteristics of the calculated model under study is carried out.Based on the obtained analysis results, the temperature fields of the beam at certain time intervals are determined.Due to the uneven distribution of temperature in the cross section of the element, temperature deformations are occured.Also, due to the limitation of deformations by external connections, their appearance is accompanied by the development of temperature stresses.Therefore, the study of the peculiarities of thermal deformations in steel structures has considerable practical importance.Due to the urgency of the problem of determining thermal stresses and strains in structures, it is necessary to clarify and improve existing calculation methods, which can not sufficiently take into account changes in time of physical and mechanical characteristics of steel.Therefore, the authors of the article calculated the coefficients of reduction of the physical properties of the section and performed a static analysis of the structure. The change of the stress-strain state of the floor elements under the influence of fire is shown.The results of the analysis showed the importance of taking into account the influence of temperature on the strength and deformation characteristics in the calculation of structures.The authors of the article developed and presented an algorithm for analysing the strength of steel structures for flexibility, taking into account the thermal conduction analysis and the fire resistance analysis.
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.
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