METHODS REVIEW OF PREVIOUS SELF-STRESSES CREATION IN BENDED SPATIAL STEEL REINFORCED CONCRETE STRUCTURES

Abstract

Bent reinforced concrete structures are usually structures for buildings covering of various functional purposes. Reinforced concrete spatial structures are structural forms of parts or a prefabricated building as a whole, the basis of which is a discrete-continuous building element. The creation of such structures is based on the principle: each of the elements used is in the most favorable working conditions: concrete for compression, and steel for tension. The concrete shelf working on compression, at the same time carries out functions of a hard disk. The load from the own weight of the reinforced concrete shelf can be compared with the payload on the floor in residential and office buildings. That is, a significant part of the deformation of the floor elements can be avoided by taking special measures on the construction site during the concreting of this slab.

Pre-stresses in structures of this type are created by pre-tensioning the stretched lower belt of the structure, which is realized mainly in the form of tightening. Self-stresses can be provided as follows. For example, by varying the number and pitch of the struts between the compressed upper reinforced concrete belt and the lower stretched rod system, as well as the boom of the upper reinforced concrete belt and the stretched lower belt, it is possible to achieve a rational distribution of forces between these components at the design stage. Structurally providing an inseparable scheme of operation of several typical spatial reinforced concrete structures, it is possible to achieve a rational redistribution of forces in their sections by a step-by-step scheme of concreting the upper monolithic reinforced concrete shelf and the appropriate inclusion of stretched steel belt in the work.