Estimation of fire resistance of bending reinforced concrete elements based on concrete with disperse fibers

Abstract

The results of estimative calculations of bearing capacity, critical temperatures, and fire resistance ratings of reinforced concrete bending elements based on fiber concrete with disperse reinforcement of steel, basalt and synthetic fiber are presented. The calculations carried out on the example of a reinforced concrete rectangular beam both taking into account the percentage of reinforcement of each element and at a constant load corresponding to the condition of calculation adequacy showed that disperse reinforcement of a reinforced concrete bending element with steel, basalt and synthetic fiber increases its bearing capacity, but slightly affects critical temperature and fire resistance rating. Despite the fact that concrete with basalt fiber is the least sensitive to heat, concrete with steel and synthetic fibers turned out to be comparable in this indicator with ordinary concrete. The presented results of evaluative calculations allow predicting the use of bending reinforced concrete elements based on concrete with disperse fibers in conditions of increased fire hazard, depending on the percentage of reinforcement and on the workload.

Assessment of fire resistance of fireproof reinforced concrete structures

“…The proposed model makes it possible to investigate the physical processes occurring precisely in fire-protected reinforced concrete structures, with scientifically based parameters of flame-retardant coatings. Such advantages that manifested in the possibility of taking into account the characteristics of flame-retardant coatings could not be achieved in works [9,10] since it was not possible to take into account the thermophysical characteristics (thermal conductivity, heat capacity) of flame-retardant coatings in the form of temperature dependences and build a finite-element model of a fireproof structure. The constructed model makes it possible to explore the stationary and non-stationary heating of both fire-protected and fire-protected reinforced concrete structures.…”

“…The results of estimation calculations are reported in [9], making it possible to predict the use of bending reinforced concrete elements based on concrete with dispersed fibers under conditions of increased fire danger, depending on the percentage of reinforcement and loading. However, the issues of behavior of bending reinforced concrete elements under fire conditions with the use of fire retardant coatings with scientifically based parameters to increase the limits of fire resistance of structures remained unresolved.…”

Method of Identification of Mechanical Characteristics of Concrete of Reinforced Concrete Crossbars according to the Results of Fire Tests

“…To eliminate these shortcomings, it is effective to use approaches that allow specifying the properties of concrete and reinforced concrete based on the generalization and interpretation of data obtained as a result of fire tests. In view of the above, it can be noted that the importance and relevance of the tasks of studying the mechanical properties of materials of reinforced concrete crossbars based on the generalization and interpretation of the results of fire tests [20,21].…”

Concrete and Fiber Concrete Impact Strength

“…To increase the fracture toughness, many researchers propose the use of steel fiber [5]. Steel fiber concrete is effective in construction in earthquake-prone areas due to its increased resistance to dynamic loads [6][7].…”