Melnik O. Inflexibility and durability of reinforce-concrete elements of hollow three-cornered cut are with normal cracks at twisting

Object of research - reinforce-concrete elements of hollow three-cornered cut with normal cracks; goal - development of methodology of determination of turning inflexibility and durability of reinforce-concrete elements of hollow three-cornered cut with normal cracks and structural decision of the reinforce-concrete systems, which allows to increase the effect of spatial work in the constructions of bridges and ceiling; methods - a method of computer design of constructions with the use of programmatic complexes which will realize the method of complete elements (during realization of numeral calculations); a numeral-analytical method is with the use of differential equalizations and methods of differential and integral calculation (at development and perfection of numeral-analytical methodology of determination of turning inflexibility of reinforce-concrete elements with normal cracks); experimental researches are on the standards of reinforce-concrete beams; language of Turbo Pascal and software environment of Delphi 7.0 (at creation of the computer program of determination of parameters of inflexibility and durability at twisting of investigational elements); results - numeral-analytical methodology of determination of turning inflexibility of reinforce-concrete element of hollow three-cornered profile is worked out with normal cracks at twisting; the conducted experimental researches on the standards of reinforce-concrete beams with normal cracks allowed to set that standards with normal cracks at twisting have linear dependence a "twisting moment is a corner of turn"; worked out computer program for determination inflexibility and durability of parameters of elements of hollow three-cornered profile with normal cracks in composition ceiling and bridges; the worked out engineering methodology of calculation of inflexibility and durability of reinforce-concrete elements is with normal cracks at twisting; it is experimentally set that at the increase of diameter of longitudinal armature and thickness of upper berth inflexibility of element increases with normal cracks; at consideration of efforts which arise up at the local loading the effective profile of beams of ceiling and bridges is certain in bridge constructions and ceiling, that provides the increase of inflexibility and effect of spatial work; novelty - first the experimentally got dependences " twisting moment-corner of rollup" for the beams of hollow three-cornered cut with normal cracks, reinforced by a longitudinal armature; first got dependences of destructive of twisting moment on the thickness of upper berth for the beams of hollow three-cornered cut with normal cracks; the improved methodology of determination of turning inflexibility and durability is at twisting of reinforce-concrete elements with normal cracks, which is developed on the elements of hollow three-cornered profile; the got results of numeral-analytical researches of the tense state of ceiling are from the beams of hollow three-cornered cut, which differ from existing clarification efforts due to the account of turning inflexibilities of their component elements; implemented - in development of normative documents, during planning and in an educational process.