Krishan A. L.

THE INFLUENCE OF FLEXIBILITY ON BEARING CAPACITY OF COMPRESSED REINFORCED CONCRETE ELEMENTS

Suggestions on the calculation of flexibility of compressed reinforced-concrete elements at determination of their bearing capacity are stated in the work. On the basis of modern principies of deformation model approach The method of calculation of stability and strength of normal sections of non-central compressed elements taking into account their flexibility, reflecting the specific properties of reinforced concrete is offered on the basis. The calculation is carried out taking into account geometrical and physical nonlin-earity of calculated constructions. The recommended sequence of calculation is given. The deformation criterion of stability and formula for calculation of relative deformation of the fiber located on the center of gravity of section and corresponding to the loss of stability of compressed element are offered. The value of this deformation depends on the effective flexibility of compressed element. It is determined by next formula The numerical analysis has shown that bearing capacity for centrally com-pressed reinforced concrete elements is caused by the strength of normal sections with the values of effective flexibility not less than 70. Bearing capacity of constructions with larger flexibility reduces with the loss of their stability.

Keywords: compressed reinforced concrete elements, effective flexibility, geometrical and physical nonlinearity, stability, strength, геометрическая и фи-зическая нелинейность, прочность., сжатые железобетонные элементы, устойчивость, эффективная гибкость