Deformability of oblique sections of RC beams on yielding supports under dynamic impact

Mescheulov, Nikita; Kumpyak, Oleg; Lyulevich, Y.

doi:10.1063/1.4973047

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…Therefore, to bring the structure into a state corresponding to the original one (before the impact), it is necessary to select such parameters of the reinforced concrete collar that, with a short-term dynamic impact, would provide similar survivability coefficients for the structure before and after its reinforcement, which together should not change the existing degree of protection of a critical infrastructure facility. The developed methodology and the survivability factor can also be useful, for example, in the design and assessment of the effectiveness of protective systems on pliable supports and systems that dampen vibrations to mitigate the dynamic impact on reinforced concrete structures under seismic, emergency shock, or explosive loads (Kumpyak et al, 2016;Chiaia et al, 2015;Mescheulov et al, 2017;Galyautdinov, 2017;Kumpyak and Mescheulov, 2017).…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…У роботі [8] аналізується вплив початкових тріщин на міцність похилих перетинів залізобетонних балок, посилених вуглецевим волокном. Поведінка похилих перетинів залізобетонних балок у процесі поперечного динамічного навантаження досліджується в [9], зокрема наголошується на перевагах використання податливих опор, поданих як вставні елементи з кільцевим поперечним перерізом.…”

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Stress-deformed state of proof areas of reinforced concrete beams

Neutov¹,

Holovata²,

Kirichenko³

2021

Bulletin of KhNAHU

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Abstract. The results of experimental studies of the stress-strain state of the support sections of rein-forced concrete beams from some of the most signifi-cant factors are presented. It was found that during long-term loading such factors are the level of the initial loading; concrete class; the percentage of transverse reinforcement in the shear span; the per-centage of longitudinal reinforcement in the com-pressed zone; the percentage of longitudinal working reinforcement in the extended zone. With an increase in the class of concrete, the moment corresponding to the appearance of normal cracks and the shear force corresponding to the appearance of inclined cracks slightly increase, although they lag behind the growth of the class of concrete. The process of crack-ing in the investigated beams begins, as a rule, with the appearance of normal cracks in the zone of pure bending at a load level (0.15... 0.33) from breaking. Inclined cracks appeared somewhat later, at load levels close to 0.5 of breaking. With a relatively high percentage of longitudinal reinforcement, the first oblique cracks appeared in the middle of the beam height in the shear span. At load levels close to 0.7, the process of formation of new cracks practically stops, and already existing cracks open more inten-sively. During the period of exposure to a constant long-term load, the width of the opening of normal cracks increased on average by 1.2–1.5 times, and the width of the opening of inclined cracks increased by 2.5–3 times. In the process of loading before the destruction of previously long-loaded beams, the width of the opening of normal cracks remained practically unchanged, and the width of the opening of inclined cracks increased by 1.2–1.7 times, and the breaking load for beams loaded with a preliminary long-acting load of 0.85 from the breaking load in-creased by 13–15 % compared to short-term loading. The opening width of inclined cracks along the length was different, its maximum value was ob-served in the middle of the height of the section of the support sections of the beams.

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“…Разработанная методика и коэффициент степе ни живучести могут быть полезны, например, при проектировании и оценке эффективности защит ных систем на податливых опорах и систем, гася щих колебания для смягчения динамического воз действия на железобетонные конструкции при сейсмических, аварийных ударных или взрывных нагрузках [43][44][45][46][47][48][49][50].…”

unclassified

Оценка Степени Живучести Ответственных Строительных Конструкций При Ударно-Волновом Нагружении

Odnokopylov¹,

Sarkisov²,

Анатольевич³

2018

IZVESTIYA

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1 Национальный исследовательский Томский политехнический университет, Россия, 634050, г. Томск, пр. Ленина, 30. 2 Томский государственный архитектурно строительный университет, Россия, 634003, г. Томск, пл. Соляная, 2. Актуальность работы обусловлена техническим усложнением объектов нефтегазового комплекса вследствие увеличения объе мов и скорости добычи сырья, на которые возможно воздействие ударно волновых нагрузок при нештатных ситуациях. Причи нами воздействия могут быть взрывы, падения тяжелых грузов, террористические акты, природные и техногенные катастрофы и т. д. Данные ситуации с большой вероятностью приводят к значительному повреждению строительных конструкций производ ственных зданий и сооружений. Вследствие чего для обеспечения дальнейшего функционирования сооружения необходимо проектировать строительные конструкции и объект в целом, обладающие свойствами живучести при нестационарном воздей ствии. Учет таких свойств должен анализироваться при построении сценариев возникновения и развития нештатных ситуаций, а также при анализе рисков. Таким образом, разработка способов оценки степени живучести строительных конструкций при ударно волновом воздействии является актуальной задачей. Цель работы: создание практически применимого способа оценки степени живучести строительной конструкции при кратко временном ударно волновом нагружении на основе анализа энергетического параметра. Методы исследования: измерения ускорений, прогибов и нагрузки методами тензометрии, графоаналитический метод иссле дования с применением программы Microsoft Excel. Результаты. Разработан способ оценки степени живучести строительной конструкции при ударно волновом нагружении для ответственных строительных конструкций сооружений нефтегазового комплекса с применением коэффициента степени живу чести. На примере конкретного испытания изгибаемого железобетонного элемента на кратковременную динамическую нагруз ку получены значения указанного коэффициента. Внесены предложения по направлениям использования коэффициента степе ни живучести при проектировании строительных конструкций зданий и сооружений, эксплуатируемых при возможном воздей ствии кратковременных динамических нагрузок.

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Deformability of oblique sections of RC beams on yielding supports under dynamic impact

Cited by 5 publications

References 11 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

Stress-deformed state of proof areas of reinforced concrete beams

Оценка Степени Живучести Ответственных Строительных Конструкций При Ударно-Волновом Нагружении

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