Stadnyk V. Inflexibility and durability at twisting of reinforce-concrete T-shaped elements with normal cracks

Object of research: reinforce-concrete elements of T-shaped section with normal cracks. Objective: development of methods of determination of turning inflexibility of reinforce-concrete elements with the normal cracks of rectangular section on the elements of T-shaped section; development of engineering methods of calculation of inflexibility and durability of elements of T-shaped section; research of influence of turning inflexibility of elements on the redistribution of efforts between separate elements statically indefinite reinforce-concrete systems. Research methods and equipment. method of computer design of constructions with the use of programmatic complexes which realize FEM (during realization of numeral researches); numeral-analytical method with the use of differential equalizations and methods of differential and integral calculation (at development of numeral-analytical methods of determination of turning inflexibility of reinforce-concrete elements with normal cracks); experimental researches on physical standards. Results. The got results of researches and offered methods of determination of inflexibility allow to specify the sizes of internal efforts in the elements of the reinforce-concrete systems of T-shaped section with normal cracks, and also to estimate their margin of safety. Novelty. First dependences are experimentally got a "twisting moment - corner of rollup" for the elements of T-shaped section with normal cracks, reinforced by a longitudinal armature; got dependences for the destroying moment of twisting, for the elements of T-shaped section with normal cracks; the methods of determination of turning inflexibility are developed on the elements of T-shaped section; the methods of determination of durability are first worked out at twisting of reinforce-concrete elements of T-shaped section with normal cracks. Implementation. The results of researches are inculcated: by the Научно-производственным enterprise "Building science" of Academy of building of Ukraine at development of project of strengthening of flags of coverage of 3х12 m of workshop №11 and flags of coverage of 3х18 m of workshop №16 of "BESPA the name of М.В. Frunze" in part of determination of turning inflexibility of ribs of flags; LTD. "OSME" at development of project of strengthening of flags of coverage of 3х6 m in part of determination of turning inflexibility of ribs of flags; educational process of OSABA at preparation of students.