Calculation of Limit Axial Deformations of the Concrete Core of Compressed Tube-Reinforced Concrete Elements

Кришан, А Л; Rimshin, Vladimir; Astafeva, M A; TROSHKINA, E.A.

doi:10.31659/0044-4472-2019-6-39-42

Cited by 7 publications

(6 citation statements)

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“…When , moreover, at large moments, the compressive force is neglected, and at high compressive forces, the moment is neglected [35][36]. For example, for a single-span pivotally supported beam loaded with a uniform load q = const, when…”

Section: Resultsmentioning

confidence: 99%

Residual resource of power resistance during building structures deformation

2019

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Modern scientific research and design developments, based on the fundamental principles of physics, mechanics and thermodynamics, are developing in a phenomenological direction. This implementation is found both in traditional integrated models of reinforced concrete using the advantages of computer technology, and in discrete models following the grid methods of solid deformable body mechanics. Discrete models in content and chronology over time are hereditary with respect to integral models. The theoretical basis for calculating the residual life of the force resistance to deformation, determines the stiffness of the cross sections of reinforced concrete elements with a maximum bending moment and with zero bending moment are presented in this article.

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Section: Resultsmentioning

confidence: 99%

Residual resource of power resistance during building structures deformation

2019

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“…The damage effect to the support nodes of beams and columns on the power resistance. The effect of node damage (changes in boundary conditions) is illustrated on the main elements of building frames -beams and columns [17][18][19][20][21][22][23][24][25].…”

Section: Wherementioning

confidence: 99%

“…Two identical single-span beams are compared with a span of l m, but with different boundary conditions; in particular, the B-1 beam, pinched on the supports and loaded with a uniform q = const, and the B-2 beam, pivotally supported on the supports and loaded with the same uniform load q = const. The beam B-1 bending moments in pinching equal: (19) mid-span (20) and the angle of the reference section rotation is zero. The beam B-2 bending moments are described by the equation 21which leads to the calculation of the reference moments (22) and mid-span moments (23) wherein the angle of the reference section free rotation (24) It follows that the beam B-1 without destruction can perceive as a uniform load (25) and beam B-2, respectively (26) that is half as much.…”

Section: Wherementioning

confidence: 99%

Reserves and exposure assessment of reinforced concrete structures safety while reducing its power resistance

2019

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Structural safety of buildings is such an engineering state of the structures operability, foundations, the features of their joint power resistance to expected loads and impacts, taking into account their possible combinations in direction, intensity and mode, which ensures the established functional use with established reliability. The structural safety of buildings depends on design, on compositional and structural solutions, technological measures during construction and operation, which must be provided at all stages of the facility’s existence (construction, operation, repair, reconstruction, dismantling and dismantling). It is necessary to take into account the structural safety parameters of reinforced concrete structures that have received corrosion damage during solving the problems of construction and reconstruction of buildings and structures. Suggestions to quantify the reserves and exposure of structural safety and, accordingly, the reduction in power resistance of corrosion-damaged reinforced concrete structures are presented in this article.

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“…Сталебетонные стержни в последние десятилетия вызывают повышенный интерес отечественных [1][2][3][4][5][6][7][8][9][10] и зарубежных ученых [11][12][13][14][15][16][17][18][19][20][21][22][23], поскольку позволяют наиболее полно сочетать основные преимущества, свойственные как металлам, так и бетонам, при этом нивелируя или полностью устраняя их недостатки [2,3,10]. Так, стальные конструкции являются весьма прочными, но, в силу хороших упругих свойств, практически не демпфируют механическую энергию, что делает затруднительным их применение в условиях колебаний и вибраций и требует использования специальных систем вибро-и сейсмозащиты [11].…”

Section: Introductionunclassified

“…В свою очередь железобетонные элементы при соразмерной несущей способности являются гораздо более массивными, плохо сопротивляются накоплению повреждений, зарождению и развитию трещин. Применение сталебетонных элементов, образованных путем заключения железобетона или бетона в стальную обойму, также приводит к нелинейному приросту несущей способности за счет перехода сердечника в трехосное напряженное состояние [1,[4][5][6][7][8][9][10][24][25][26][27]. Вопросы, связанные с деформированием и разрушением бетонов повышенной прочности при объемном сжатии [28,29], в том числе при термомеханическом нагружении [30], в последние годы являются весьма актуальными.…”

Section: Introductionunclassified

Elastic-Plastic Deformation of Steel-Concrete Beams With Local Crumpling During Three-Point Bending

Khazov,

Vedyajkina,

Pomazov

et al. 2024

PSP

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The study presents the results of experimental modeling of elastoplastic deformation of bent massive concrete filled steel tube beams under three-point bending. It has been shown that local deformations and local crushing in such structures have a significant impact on their behavior. The applicability of the theory of bending of a hollow steel beam according to the Bernoulli model is analyzed. A comparison has been made of the bearing capacity and stress-strain state of hollow steel tubes (according to the Bernoulli model and the results of experiments) and concrete filled steel tube beams, and the contribution of the concrete core to the bending resistance during elastoplastic deformation has been quantitatively assessed. The actual load-bearing capacity of a hollow pipe during three-point bending does not exceed 50% of the calculated theoretically determined one, which indicates the impossibility of using the classical bending model when designing systems of this kind. In this case, the concrete filled steel tube beam not only ensures the full functioning of the metal during the deformation process, preventing its disruption, but also provides some increase in load-bearing capacity due to the inclusion of a compressed zone in the concrete work. The increase in the load-bearing capacity of a beam due to the introduction of a concrete core can reach 70%. Despite their significant weight, bendable tube-concrete rods can be recommended in conditions of a complex stress-strain state, in which, in addition to transverse bending loads, significant longitudinal forces arise, as well as local force factors that contribute to the occurrence of local crushing deformations, since, unlike a thin-walled hollow tube, concrete the core significantly prevents these effects. Based on the results of the study, the potential effectiveness of flexible tube-concrete elements for a number of structures was proven.

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Calculation of Limit Axial Deformations of the Concrete Core of Compressed Tube-Reinforced Concrete Elements

Cited by 7 publications

References 0 publications

Residual resource of power resistance during building structures deformation

Residual resource of power resistance during building structures deformation

Reserves and exposure assessment of reinforced concrete structures safety while reducing its power resistance

Elastic-Plastic Deformation of Steel-Concrete Beams With Local Crumpling During Three-Point Bending

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