Semko P. Stress-Strain State and Bearing Capacity of Demountable Joints of Concrete Filled Tubular Elements

Object of study: work of demountable joints of concrete filled tubular (CFT) elements; the purpose of the study: investigation of strained-deformed state and bearing capacity of demountable joints of CFT elements; research methods and equipment: during performing a scientific research methods of construction mechanics and finite elements were used for determining the forces in structures; methods and equipment for the experimental study of the stress-strain state of building structures; methods of mathematical statistics for the processing of the results of experimental studies; theoretical and practical results: diagrams of bearing capacity of CFT constructions and their joints are obtained; An engineering methodology for constructing N-M limit dependencies was proposed, which was implemented as a computer program for automation of calculation; on the basis of the feasibility study proposed an effective construction of the demountable joint of compressed CFT elements; recommendations for designing a demountable joint with steel couplings, flange connections and demountable joints with longitudinal ribs have been developed.; novelty: five new designs of demountable joints for compressed CFT elements have been developed, which are protected by patents; the experimental values of the bearing capacity of detachable joints for CFT elements were first obtained; an algorithm for numerical modeling of demountable joints of CFT structures was improved, and modeling of prototypes under conditions similar to experimental ones was carried out; the non-radiative technique for constructing the limiting N-M dependencies and nomograms of the bearing capacity for CFT structures and their compounds were further development; implementation efficiency: the results of the work are introduced into the practice of the production of Interstal Design Bureau - they were used in the development of variants for joints of CFT racks of multistoried skeletons of public buildings in Kremenchuk and Poltava. Also, suggestions were made for graphically comparing the combinations of design loads for pipe-concrete elements; "Poltava-project" - for calculating of the connections of CFT racks of a multistory building to the address: Sobornosti St., 43, Poltava; published 13 publications, including 5 articles in professional journals, 2 articles in journals included in international science-metric databases, 2 articles in foreign journals; participated in 6 scientific conferences of various levels, received 5 patents for utility models; application area: construction.