Determination of fire resistance limits for modern reinforced concrete building structures using computer simulation in ANSYS
Keywords:fire resistance limits, reinforced concrete structures, standard temperature regime, temperature fields, modeling, finite element method
Purpose. To develop a method for determining the fire resistance limits of modern building structures made of reinforced concrete, based on computer simulation of their heating during a fire, as well as on modeling taking into account the changing properties of concrete and reinforcement.
Methods. Theoretical and experimental research methods were applied to solve the set tasks. The finite element method was used to evaluate the fire resistance by the loss of bearing capacity. The theoretical method is based on solving thermophysical and static problems. To assess the fire resistance of modern building structures made of reinforced concrete, it is necessary to know the patterns of their destruction during non-stationary heating, as well as the temperature distributions over the cross section of the structure. To obtain these data, both laboratory and field tests have been carried out.
Findings. The method for determining the fire resistance limits of load bearing function (R) of modern building structures made of reinforced concrete has been developed. This method was realized in software-computer complex ANSYS. Numerical finite element modeling made it possible to determine the fire resistance limit by the loss of bearing capacity and develop methods for improving fire resistance. The results of numerical simulation are compared with experimental data.
Application field of research. The obtained results can be used in the development of standards for the design and construction of reinforced concrete structures, and the developed methodology can be used to solve problems of assessing the fire resistance of building structures and the elements in the process of the design and construction of buildings and structures, including the framework of existing standards.
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