CONSIDERATION OF DESIGN FEATURES OF CURVED ELEMENTS IN DETERMINING SHEAR RESISTANCE

Abstract

The constructive solution of curved beams has some excellence associated with the features of the static scheme of such elements. In the inclined part of the beams of a curved elements, a longitudinal compressive action, which increases the crack resistance of the inclined sections and the shear resistance. To assess the magnitude of the compressive action and the degree of its influence on the stress-strain state of the support zone of the beams, experimental studies were carried out. Tests were carried out on beams of a rectilinear shape, prestressed with tendons, part of which was bent-up near the support, and curved beams with a rectilinearly located prestressing reinforcement. The creation of axial compressive action in the support zone due to a change in the shape of the longitudinal axis of the beam makes it possible to reduce the amount of precompression created by prestressing reinforcement and avoid its destructive effect on the contact layer between concrete and reinforce with conservation the required crack resistance and shear resistance.