Gukasian O. Concreting technology impact on a strength of tube confined concrete members

The research subject is concrete core performance in tube confined concrete elements. The research objective is to determine the strength of concrete core in tube confined concrete elements, taking into account effects of the concreting technology. The novelty of the research is as follows: experimental findings of the most dangerous types of concreting defects (cavities, voids, height strength heterogeneity, etc.) in relation to their effect on the strength of tube confined concrete elements have been made in the research; the study of influence patterns of concreting technological factors (concrete mix mechanical and physical properties, methods of its placement into the tube casing, its compaction and hardening conditions etc.) and the length of elements on the strength of tube confined concrete elements core has been carried out for the first time; the calculation technology of possible technological concrete core heterogeneity in tube confined concrete elements has been improved, which can be carried out during the strength control tests according to the reference concrete samples as part of the boundary states method (partial safety factors). The research results are as follows: Condition load coefficient for taking into account heterogeneity of concrete physical and mechanical properties of tube confined concrete elements has been proposed; recommendations on tube casing concrete filling technology on the construction site have been made; Sector – construction.