SYNTHESIS OF THE DESIGN METHODS OF THE MEMBERS OF PRECAST FLAT PLATE FRAME STRUCTURAL BUILDING SYSTEM

Abstract

The process of evolution of structural systems of buildings made of reinforced concrete is currently attracting more and more attention of scientists and designers. After all, along with traditional structural systems, new structural systems have confidently established themselves, which are beginning to be widely used due to the presence of significant advantages over their prototype predecessors. But so far, new efficient solutions with a variety of design systems in the design are reduced to common design schemes. Their essence, as a rule, consists in conditional division of a framework into flat frames, in which efforts and movements of members are defined on the basis of traditional methods. This approach is used for both slab on beams and flat slab frames. Thus, in analysis of flat slab frameworks the schemes formed by conditional allocation of stripes of an overlapping slab between columns, thereby turning them on a slab on beams in orthogonal directions, are often used. This transformation reflects the synthesis of flat slab and slab on beams. But, as evidenced by the practice of operation of precast flat slab structural systems, this approach does not reproduce the true work of its members. Therefore, when choosing a design scheme of flat slab structural system, it should be guided by the basic principles of transformation of structural systems into each other, taking into account the peculiarities of their individual members in the limit state. Based on the stated approach the general principles of calculation of bearing capacity of flat slab structural systems of buildings and their constituent members are offered. The proposed design schemes for loading and destruction of these members are confirmed by experimental tests. The essence of the kinematic method of limiting equilibrium of reinforced concrete structures is the basis of the created design method.