EFFECTIVE OPTION OF REINFORCEMENT FOR REINFORCED CONCRETE TAPERED ELEMENTS

Abstract

Despite a large number of experimental and theoretical studies on the resistance to shear and crack formation of tapered elements, there are no reliable data in the domestic and foreign literature on the distribution of stresses in such elements in areas near fractures of the faces.
 In the article, based on the results of experimental studies, an analysis of the stress-strain state of tapered elements is performed. The main design factors affecting the stress distribution, as well as the nature of the formation and development of cracks are revealed. It is established that in gable beams, inclined cracks are formed not only in the support zone, but also in the middle of the span directly at the ridge, even in the absence of transverse force. The features of the stress-strain state of the beams of the broken outline are associated with the occurrence of tangential stresses from the action of the bending moment and longitudinal force due to the variable height of the section of the element, as well as with the formation of local stress fields in areas near the fractures of the faces.
 Based on the data obtained on the basis of experimental and theoretical studies, an effective option for reinforcing ridge zones of reinforced concrete gable beams and frames is proposed.