Abstract
The paper presents field experiments and analytical description results of physical and technical parameters of bending reinforced concrete structures and their fire resistance. The results take into account the burial depth of working reinforcement, the thermo-diffusion value of protective layer concrete, the degree of reinforcement fire resistance, the nominal diameter of working reinforcement. The degree of reinforcement fire resistance is characterized by the thickness of the protective layer of concrete that changes its size and thermal characteristics in conditions of high temperatures, corrected for the conditions of the center of gravity in the reinforcement cross-section heating up. The study reveals a mathematical description of the indicators, which take into account the value of concrete thermo-diffusion reduced coefficient, intensity of force tension in working reinforcement and the size of its diameter. Analytical functions are derived for these indicators. This research results can be used for making computer algorithms and programs to calculate design fire resistance of bending reinforced concrete constructions of buildings and constructions.
Highlights
The paper an analytical description of physical and technical characteristics of bending reinforced concrete structures influencing their design fire resistance
Where Jσs is the intensity of stresses in the reinforcement from the current load (0 ÷ 1); aes is reinforcement fire protection with concrete, mm; Cm is the indicator of the static scheme of reinforced concrete structure work
The degree of reinforcement fire resistance is influenced by the thickness of the concrete protective layer, its thermos-physical characteristics, the diameter of the reinforcement, the heating scheme of the reinforcement bars in the element cross-section, i.e
Summary
The paper an analytical description of physical and technical characteristics of bending reinforced concrete structures influencing their design fire resistance. These characteristics include the laying depth of the working reinforcement, the degree of concrete thermal diffusion, the degree of reinforcement fire resistance, the working reinforcement nominal diameter
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