The dynamic loading in longitudinal and transverse reinforcement at instant emergence of the spatial srack in reinforced concrete element under the action of a torsion with bending

Demyanov, Aleksey; Kolchunov, Vladimir

doi:10.5937/jaes15-14663

Cited by 14 publications

(3 citation statements)

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“…One of the most common options for strengthening concrete structures is the reinforced concrete collar, carried out by joint grouting of damaged structures with concrete and the installation of an additional reinforcement frame. It is known that in reinforced concrete, due to its nonlinear properties under short-term dynamic loads, complex processes occur (Plevkov, 1996;Baumung et al, 2001;Plevkov et al, 2004;2008;Sarkisov et al, 2020;Venkiteela et al, 2013;Belov et al, 2016;Dong et al, 2017;Odnokopylov and Sarkisov, 2017;Gao et al, 2017;Chen et al, 2017;Demyanov and Kolchunov, 2017;Savinykh et al, 2018;He et al, 2020;Likhov et al, 2020;Orton et al, 2021). Therefore, the design of reinforced concrete structures under such types of impact is a scientific problem.…”

Section: Introductionmentioning

confidence: 99%

Analysis of changes in the survivability of building structures reinforced after an emergency dynamic impact in the context of assessing the security of buildings in the oil and gas industry

Sarkisov¹,

Building²

2021

Int. j. adv. appl. sci.

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The relevance of the subject matter is conditioned by the technical complexity of the oil and gas facilities due to the increase in the volume and rate of raw materials production, which may be affected by shock-wave loads in emergency situations. The causes of the impact can be explosions, heavy cargo falls, terrorist attacks, natural and anthropogenic disasters, etc. These situations are very likely to cause significant damage to the building structures of industrial facilities, which necessitates their reinforcement. For further safe operation of the facility, reinforced structures must have survivability under repeated impacts no less than before the reinforcement. Given the fact that the survivability of buildings is a complex characteristic influenced by many factors, and it itself is a component of the security of a hazardous production facility, research in this area is topical. The purpose of the study is to test the developed method for assessing the survivability of a building structure under short-term shock-wave load based on the energy parameter and to analyze the results obtained in the context of assessing the security of critical oil and gas facilities. Research methods: Measurement of accelerations, deflections, and loads by strain measurement methods, graphoanalytical method of study using the Microsoft Excel software. A method for assessing the level of survivability of a building structure under shock-wave loading for critical oil and gas facilities using the survivability coefficient is developed. Using specific tests of conventional and cage-reinforced bending concrete elements for short-term dynamic load, the values of the specified coefficient are obtained. The values are compared and conclusions are drawn.

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Section: Introductionmentioning

confidence: 99%

Analysis of changes in the survivability of building structures reinforced after an emergency dynamic impact in the context of assessing the security of buildings in the oil and gas industry

Sarkisov¹,

Building²

2021

Int. j. adv. appl. sci.

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“…It should be noted that until now a relatively limited number of studies on the stress-strain state of structures under combined loading have been conducted. In this field a number of Russian and various international studies on reinforced concrete structures from regular concrete can be mentioned, for example [9][10][11][12][13][14][15]. Even less studies are devoted to testing beams and other structures under combined bending and torsion.…”

Section: Introductionmentioning

confidence: 99%

Results of experimental studies of high-strength fiber reinforced concrete beams with round cross-sections under combined bending and torsion

Травуш

Karpenko

Kolchunov

et al. 2020

Struct. Mech. of Eng. Const. and Build

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The aim of the work - experimental investigation on crack propagation and deformation in high-strength fiber reinforced concrete beams with round cross-sections under combined bending and torsion for the development of practical methods of crack resistance, deformation and strength analysis of such structures, and also for the accumulation of new experimental data on resistance under combined loading. Method is experimental-theoretical. Results. Deflection plots and force-deformation relationships for high-strength fiber reinforced concrete beams with round cross-sections under combined bending and torsion are determined experimentally. Principal deformations in terms of elongation and compression of concrete for the experimental beam structures with high torsion to bending moment ratio are determined. It is established that for high-strength fiber reinforced concrete structures of circular cross-section, generally, development of one-two discrete cracks is observed, therefore the circular shape of the cross-section slightly reduces the concentration defined by the material structure of high-strength concrete. On the basis of the conducted investigation on high-strength fiber reinforced concrete structures with circular sections, new experimental data on the combined stress-strain state in the studied areas of resistance is obtained, such as: values of generalized cracking, and failure, load, its level relative to the ultimate load; distance between the cracks at different stages of crack propagation; crack widths at principal reinforcement axis level, at a double diameter distance from the principal rebar axes and also along the entire crack profile at various stages of loading; coordinates of nonplanar crack formations; patterns of crack formation, development and opening in reinforced concrete structures under combined bending and torsion.

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“…Составляющие касательных напряжений, обусловленных депланацией, определяются из зависимостей: 13 сечения. При этом все поле большого круга разбивается на ряд квадратов, которые впоследствии заменяются вписанными в них малыми кругами.…”

Section: Introductionunclassified

To Determination of Stress-Strain State for a Rod of Arbitrary Cross Section Under Torsion Using Mechanics of Materials

Kolchunov¹,

Dem'yanov²

2019

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Юго-Западный государственный университет, г. Курск, Россия Аннотация. Предложен новый подход к определению касательных напряжений кручения для стержней произвольного поперечного сечения, базирующийся на упрошенных предпосылках сопротивления материалов. Его особенность заключается в аппроксимации прямоугольных и любых сложных поперечных сечений железобетонных конструкций с помощью их разбивки на квадраты с вписанными в них кругами, соединенными между собой в единую монолитную фигуру в большом круге, описанном вокруг любого поперечного сечения. В пределах большого и каждого i-ого круга становится справедливой зависимость касательных напряжений кручения от расстояния до центра рассматриваемого круга. Максимальные напряжения согласно предлагаемой методике достигаются в срединах длинных сторон прямоугольника, что соответствует их действительному распределению. При этом такая модель позволяет снять вопрос о необходимости использования специальных таблиц для расчета не только в упругой стадии. Она также позволяет отделить напряженно-деформированное состояние в целом наборе круглых сечений от дополнительного поля, связанного с депланацией прямоугольного сечения. Авторами откорректированы и существенно дополнены зависимости для учета депланации стержня прямоугольного поперечного сечения, вводится понятие и предложены зависимости для учета местной депланации. Акцентируется внимание на физической сути продольных перемещений, обусловленных депланацией, проводится аналогия с элементарными перемещениями, вызываемыми сдвиговыми усилиями. Предложенная методика позволяет учитывать концентрацию угловых деформаций в углах и других резко изменяющихся геометрических параметрах как относительно плоскости поперечного сечения, так и в направлении продольной оси стержня. Малые i-тые круги, попадающие в контур поперечного сечения стержня, служат в качестве "конденсирующих", -именно в них сосредотачиваются элементы жесткости и эффективные значения параметров напряженно-деформированного состояния, которые обеспечивают сопротивление поперечного сечения стержня кручению. Трансформационные переходы от цилиндрической к декартовой системы координат и привлечение местных систем координат, позволили максимально упростить полученные зависимости. Разделение расчетных параметров на соответствующие составляющие напряженно -деформированного состояния предоставляет возможность их глубокого анализа.Ключевые слова: кручение, напряженно-деформированное состояние, сопротивление материалов, произвольное сечение, предлагаемая методика, депланация, концентрация, конденсация. №1 (81) 2019 (январь-февраль) _________________________________________________________ 11 valid. The maximum stresses according to the proposed method are achieved in the middle of the long sides of the rectangle, which corresponds to their actual distribution. At the same time, this model allows us to remove the question of the need to use special tables for the calculation not only in the elastic stage. It also allows you to separate the stress-strain state in the whole set of circular ...

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The dynamic loading in longitudinal and transverse reinforcement at instant emergence of the spatial srack in reinforced concrete element under the action of a torsion with bending

Cited by 14 publications

References 0 publications

Analysis of changes in the survivability of building structures reinforced after an emergency dynamic impact in the context of assessing the security of buildings in the oil and gas industry

Analysis of changes in the survivability of building structures reinforced after an emergency dynamic impact in the context of assessing the security of buildings in the oil and gas industry

Results of experimental studies of high-strength fiber reinforced concrete beams with round cross-sections under combined bending and torsion

To Determination of Stress-Strain State for a Rod of Arbitrary Cross Section Under Torsion Using Mechanics of Materials

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