dc.contributor.author |
Крусь, Ю. О.
|
|
dc.date.accessioned |
2022-09-19T11:18:16Z |
|
dc.date.available |
2022-09-19T11:18:16Z |
|
dc.date.issued |
2022 |
|
dc.identifier.uri |
http://ir.stu.cn.ua/123456789/25997 |
|
dc.description |
Крусь, Ю. Зв’язок між напруженнями і деформаціями бетону за різних силових режимів короткочасного осьового стиску / Ю. Крусь // Технічні науки та технології. - 2022. - № 1 (27). - С. 184-198. |
en_US |
dc.description.abstract |
Запропонована зручна для користування та математичного опрацювання апроксимативна функція діаграми деформування, що відображає зв’язок між напруженнями й деформаціями бетону за «жорсткого» силового режиму
однорідного стиску. Її одночасне застосування з отриманою раніше діаграмою для м’якорежимного навантажування надає можливість отримати стабільну й вільну від зайвих чинників впливу діаграму стану бетону, придатну для базованих на деформаційній моделі перерізів розрахунків зігнутих залізобетонних елементів (конструкцій) за всіма групами граничних станів та оцінки неоднорідного напружено-деформованого стану перерізів елементів (конструкцій) на будь-якій стадії навантажування аж до руйнування. |
en_US |
dc.language.iso |
uk |
en_US |
dc.publisher |
Чернігів : НУ "Чернігівська політехніка" |
en_US |
dc.relation.ispartofseries |
Технічні науки та технології;№ 1 (27) |
|
dc.subject |
concrete |
en_US |
dc.subject |
diagrams of deforming and state |
en_US |
dc.subject |
«soft» and «rigid» loading modes |
en_US |
dc.subject |
deformative model of crosssections |
en_US |
dc.subject |
deformative model of crosssections |
en_US |
dc.subject |
бетон |
en_US |
dc.subject |
діаграми деформування і стану |
en_US |
dc.subject |
«м’який» і «жорсткий» режими навантажування |
en_US |
dc.subject |
деформаційна модель перерізів |
en_US |
dc.title |
Зв’язок між напруженнями і деформаціями бетону за різних силових режимів короткочасного осьового стиску |
en_US |
dc.title.alternative |
Connection between stresses and strains of concrete under different force modes of short-term axial compression |
en_US |
dc.type |
Article |
en_US |
dc.description.abstractalt1 |
Modern design of bended reinforced concrete constructions uses analytical methods of calculation involving deformative
models, the main tool of which is the actual diagram of concrete state, which establishes the connection between its stresses
b and relative strains b in compressed and tensile zones of the cross-section. Currently, there is no a unified methodics of
establishing such a diagram, and researchers obtain it by indirect methods that differ from each other. That is why the graphanalytical
building and mathematical description of the functional dependence of the diagram of concrete state based on clear
and accurate physical representations we consider as an important and urgent problem.
The lack of a unified methodics for obtaining a diagram of concrete state cast doubt the reliability of the results of the
calculations carried out, does not allow to compare, explain and link into a unified whole the many experimental and theoretical
data accumulated by generations of researchers.
In a number of scientific publications, an opinion is expressed that a diagram of concrete state can be obtained by
simultaneous using of diagrams of concrete deforming under different force modes of short-term axial compression – «soft»
and «rigid», testing standard concrete specimens to failure at a constant rate of stress and strains growth respectively. If the
«soft» force mode without unnecessary difficulties can be realized on traditional hydraulic presses, the creation of «rigid»
mode requires the manufacture of different from standard special presses or auxiliary devices, capable of taking efforts and
unloading concrete after reaching the maximum of compressive stresses. The lack of a unified approach to obtaining diagrams
of deforming under rigid-mode loadings leads to contradictory results.
Insufficiently investigated in the general problem are the issues of theoretical justification, development and approbation
of diagram of concrete rigid-mode deforming b b ~ , complex application of which simultaneously with the diagram of deforming
b b ~ in conditions of «soft» force mode will allow to obtain a reliable and convincing diagram of concrete state.
The main purpose of the research is a graph-analytical building and mathematical description of the dependence b b ~ ,
based on clear and accurate physical representations, which experimental obtaining causes serious technical difficulties and economic
costs, and the accuracy of measurements made and the reliability of the results obtained causes big doubts.
The article develops the criteria to which the dependence b b ~ should correspond, based on modern ideas about the
nature of strength and deforming and following from the essence of physical and mechanical processes in concrete; the adequate
structure of the functional connection has been established; the boundary conditions have been drawn up and constant
coefficients have been determined; a comparative analysis of the calculation results using the proposed dependence with the
corresponding experimental data was performed.
As a result, an easy-to-use and mathematical processing of an approximate function of the diagram of deforming is
proposed, which reflects the dependence between stresses and strains of concrete under the «rigid» mode of homogeneous
compression. Its simultaneous use with the previously obtained diagram for soft-mode loading makes it possible to graphically
build and mathematically describe a stable and free from excessive influencing factors the diagram of concrete state, suitable
for based on the deformative model of cross-sections of modern calculations of bended reinforced concrete constructions for
all groups of limiting states and assessment of the heterogeneous stress-strain state of constructional cross-sections at any
stage of loading up to fracture. |
en_US |