Model of heterogeneous reinforced fiber foam concrete in bending

The paper considers a model of heterogeneous reinforced fiber foam concrete, given the bimodule in the elastic formulation. Based on the proposed model the analysis of stress-strain state of an I-beam of reinforced fiber foam concrete, arbitrarily supported and loaded arbitrarily. The dependence of maximum stress on the number of rods and their location in the compressed and stretched zones. The neutral line does not coincide with the main central axis in the bimodule materials, then the values of the maximum normal stresses also vary depending on the elastic moduli relations for tension and compression. This allows us to reasonably regulate the structural features of beams when the properties of fibrous concrete are taking into account. The value of the maximum normal stresses is compared with and without the bimodule material of the beam, from which it follows that the design load capacity of the beam increases with the bimodulity of the material taken into account. The magnitude of the maximum normal stresses in reinforced beams made of concrete of a cohesive structure with allowance for bimodulity was numerically investigated. It has been established that the normal tensile stress arising in a fiber-reinforced concrete beam is higher than in a beam of concrete of a fused structure by 42%. The value of the normal compressive stress is lower by an average of 38%. (paper)