Fire resistance of spun reinforced concrete columns
Keywords:spun concrete, coefficient of concrete working conditions in case of a fire, full-scale fire tests, fire resistance limit, calculation method, static calculation, heat engineering calculation, brittle explosive destruction of concrete
Purpose. On the basis of experimental and theoretical studies to study the fire resistance of reinforced concrete columns made by spinning.
Methods. Experimental and theoretical studies of physical, mechanical and thermophysical characteristics of spun concrete under normal conditions and at high temperature heating. Full-scale test of spun reinforced concrete columns under joint temperature and static loads. Analytical solution of thermal and static problem of fire resistance of spun reinforced concrete columns. Simulating based on Ansys Workbench and LIRA-SAPR platforms.
Findings. The difference in the physical and mechanical characteristics of spun concrete in the cross-section of structures of a given thickness under normal conditions, as well as the difference in their relative change during high-temperature heating are revealed. Experimental dependences of working factor conditions of spun concrete at a fire have been established. A reduced tendency of spun concrete to brittle explosive destruction at a fire was revealed in relation to vibrated concrete. The influence of the heterogeneity of centrifuged concrete in the cross-section of the products, the thinness of the walls and the air cavity of the products on their fire resistance has been established. The destruction mechanism of spun reinforced concrete columns in case of fire has been established experimentally, and their behavior in case of fire has been studied. A reduced tendency of spun concrete to explosive destruction at a fire was revealed in relation to vibrated concrete. A method for calculating fire resistance limits of spun reinforced concrete columns has been developed. A tabular method for estimating the fire resistance of a series of spun reinforced concrete columns has been developed.
Application field of research. The results of the study can be used for the estimation of fire resistance limits of spun concrete columns, as well as for the development of amendments to technological regulations in the field of estimation of fire resistance of spun concrete structures.
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