Fostashchenko H. A design of the stress-strain state of reinforce-concrete flags of ceiling with their spatial work

Subject of inquiry is the stress-strain state of the reinforce-concrete ceiling from the united action of the forced deformations and power loading. Thesis objective is research of the stress-strain state of the reinforce-concrete ceiling as a part of a building with respect to their spatial work, and also in the improvement of methodology of forming of spatial calculation models of ceiling in composition the system "building-founding" with application of finite elements method. Methods of research- computer modelling of constructions with help ofsoftware systems, based on the finite elements method (in the numerical experiments), field surveys methods, methods of calculation of the investigated constructions of ceiling taking into account actual stress-strain propertiesof materials and with application of modern theory of structural mechanics. Theoretical and practical results: on the basis of the conducted researches the design of the stress-strain state of reinforce-concrete flags of ceiling is executed and the variants of calculation models are created close to the real work of constructions. The research results can be used in design organization for the implementation of objects of the civil and housing facilities.Novelty of the research - different types of improvedcalculation models of the reinforce-concrete ceiling could be offered for three stages of influences: 1) without the kinematic movements of supports; 2) with movement of supports during work of building constructions; 3) at total deformations of ceiling, building and founding (improved); data of numeral and model experiments are got for determination of adequacy of calculation models of ceiling (received first); calculation models and parameters of the stress-strain state of ceilinghave been obtained, corresponding to the results of the model measuring at the account of geometrical and physical nonlinearity (first obtained); methodology of quantitative estimation of adequacy of calculation models of ceiling got further development, taking into account spatial work taken to practical application in FEM (developedfurther). Implementation extent - the results of researches are applied: for verification of adequacy of the used calculation models at control of the stress-strain state of constructions of large panel building at their smoothing that was executed in the Zaporizhzhya separation of the State enterprise the "State Research Institute of Building Constructions"; in the Research & Development Company "StroyMaster"; at an inspection and passportisation of buildingsof the Zaporizhzhya region.Range of application - design and reconstruction of industrial and civil engineering objects.