GENERAL FUNDAMENTALS OF REINFORCED CONCRETE ELEMENTS AND STRUCTURES DEFORMATION MECHANICS

Abstract

This article presents a critical development analysis of the general deformation theory and models of reinforced concrete elements and structures resistance to force effects. Their relationship with the defining provisions of the mechanics of reinforced concrete elements and structures deformation is estimated. The main disadvantages of the considered models are established. General provisions of the mechanics of reinforced concrete elements and structures deformation are proposed to be developed on the basis of a universal deformation-force model. It is noted that the latter is devoid of most of the shortcomings characteristic to other models. The main advantage of the deformation-force model is indicated, associated with the expansion of the well-known system of static, geometric and physical relationships to the level of statically definable. It becomes especially noticeable when calculating reinforced concrete elements and structures for deflections and crack resistance. One of the main features of the deformation-force model is emphasized, which makes it possible to quite simply «embed» or integrate the technical theory of reinforcement to concrete adhesion into the general theory of reinforced concrete deformation. Through the averaged design section and average deformations of materials in the block between adjacent cracks, all parameters of the normal cracks formation and opening in the deformation-force model are directly related to the parameters of reinforcement to concrete adhesion.The effectiveness of using the deformation-force model of reinforced concrete to force effects resistance was evaluated by a statistical comparison of theoretical calculations with the reinforced concrete elements experimental studies results tested by different authors. Similar comparisons were made for the methods of the current standards. It was confirmed that the priority in the accuracy of assessing the reinforced concrete elements stress-strain state parameters belongs to the calculation method, which is based on the deformation-force model of reinforced concrete resistance.