Popis: |
The co-authors consider the problem of analysis of building structures in respect of combined effects of forces and temperatures. Results of fire tests of reinforced concrete walls and slabs are presented. Overview of the analysis of the fire resistance of reinforced-concrete buildings is also provided. As a result of the research, numerical solutions were obtained in respect of deflections, stresses, deformations and internal forces arising in a reinforced concrete bearing wall and plate exposed to a combination of forces and thermal loads. Comparative analysis of the experimental data and the results of the numerical solution was performed. The conclusion is that the experimental data are in good fit to the results of the numerical solution. Overall limit state of the monolithic building under consideration in terms of its fire resistance means its failure as a result of collapse. The limit state value is equal to 60; therefore, it is equal to 60 minutes. This value, if considered in respect of separate bearing elements, fits the fire resistance limit of buildings of Grade III (Fire Resistance) that is equal to 45. Evidently, assurance of higher fire resistance limits of the building under consideration requires special fire safety actions to be applied. |