EXPERIENCE OF CREATING PRELIMINARY SELF-STRESSED IN COMPRESSED STEEL-REINFORCED CONCRETE ELEMENTS

Abstract

Problem statement. Compressed steel-reinforced concrete structures work effectively as individual racks or columns of buildings and structures for various functional purposes, and as compressed elements of spatial steel-reinforced concrete structures (for example, compressed truss members). Usually, such structures consist of a steel shell filled with concrete. The creation of the concrete core preliminary compressive stresses allows increasing the overall bearing capacity and reducing the deformability of the specified compressed elements. Purpose of the article is to analyze the existing practical methods of creating preliminary compressive stresses in the concrete core of compressed steel-reinforced concrete structures and to distinguish from them methods of the concrete core self-stressed without the use of special mechanical and force measures. Conclusion. Based on the analysis of existing scientific publications in the indicated direction, it was found that pre-stressed in the concrete core of compressed steel-reinforced concrete elements can be created due to the preliminary compression of the concrete core with jacks in outer steel pipe-shell (in a through shell), cutting outer steel shell with deformation seams into separate sections, installation of a pre- stressed double shell, etc. Preliminary self-stressed in the concrete core are created due to the following measures: use for concrete solution preparation stressed cement or a concrete mixture compaction by centrifugation during the combined structures manufacture. The specified methods of creating preliminary stresses can also be used when strengthening existing steel structures by concreting or inclusion in the steel shell joint operation reinforced concrete columns reinforcement.