Theoretical and experimental research of steel reinforced concrete beams, strengthened by steel plates

Abstract

This paper presents experimental and theoretical research for calculating of reinforced concrete beams strengthened bonded steel plates. The use of epoxy-bonded plates to strengthen existing or damaged steel reinforced concrete beams has been extensively researched. It has beenproven to be a useful and reliable method of increasing the ultimate flexural capacity of both damaged and undamaged members. The actualdeflection behavior in steel reinforced concrete beams is probabilistic in nature and requires statistical methods for a rational analysis.The strength of steel reinforced concrete bending structures are determined by the strength and deformability of concrete and steel, depend on the conditions of their joint deformation in the composition of steel reinforced concrete bending element. Steel reinforced concrete bending structures are used in public buildings are "flexible" elements, soin the extreme state when bending there are not only two neutral axes, but also a significant shift of the layers. The stress-strain state of the normal cross-section of a steel reinforced concrete element, in addition to the strength and deformability properties of concrete and steel depends on the degree of joint deformation of the concrete slaband steel beam in the plane of the joint. In steel reinforced concrete structures, steel and concrete with different strength and deformable properties are jointly deformed in a single cross-section underrelated conditions: free deformations of monolithic concrete are restrained by reinforcing mesh, steel profile shelf; free deformation of the steel loadbearing beam is prevented by monolithic concretewith reinforcement.As a result, between the steel profile and concrete, as well as between concrete and reinforcement in the normal cross section of the reinforcedconcrete element there is a complex stress state.