Experimental data of strength, deformability, and crack resistance of 2,000×200×100 mm reinforced concrete and basalt-concrete beams are given. Longitudinal reinforcement consisted of 2 Ø14 A500C for reinforced concrete beams and 2 Ø14 BFRP (AKB800) for basalt-concrete beams. Transverse reinforcement consisted of 2 Ø3, 4, 5 ВрI for reinforced concrete beams and 2 Ø4, 6, 8 BFRP (АКБ800) for basalt-concrete beams. Beams were made of heavy concrete of C16/20, C30/35, and C40/50 classes. The experimental beam specimens were tested according to a four-point scheme as loosely supported beams loaded with two concentrated forces. Loading in the series of tests was stepwise increasing, static and low-cycle repeated at high levels of 0.50, 0.65, and 0.80F ult. Distance from supports to concentrated forces (shear span), a/h 0 , varied within 1, 2, 3. Experimental beam specimens were made and tested according to the theory of experimental design according to the Box B4, optimal plan D. Comparative analysis of main performance parameters of reinforced concrete and basalt-concrete beams under the action of abovementioned loads was performed. The necessity of these studies was determined by the unsatisfactory convergence of experimental and calculated values of bearing capacity of oblique sections of basalt-concrete beams determined according to existing standard methods. The studies have established the influence of design factors and loading nature on basic parameters of the working capacity of basalt-concrete beam elements in a form of experimental-statistical dependences. These results will form a basis for a physical model of resistance of oblique sections in such structures to external loads. The presented results will significantly supplement the existing database of the operation of beam basalt-concrete structures and will be used in the development of an analytical method for calculating strength, deformability, and crack resistance
Abstract. Non-metal composite reinforcement is increasingly being used in modern construction. Composite reinforcement is a great step forward over steel, due to its higher strength and corrosion resistance. An analysis of the use of these fittings was performed, which showed that the United States, Japan and China are leading countries in the use of composite fittings. The more active pace of implementation of composite reinforcement is limited by the fact that composite reinforcement does not have a common method for calculating their bearing capacity. That is why the article discusses regulatory documents on the calculation and design of structures reinforced with composite reinforcement from around the world. The article provides a comparative analysis of the calculations of the bearing capacity of prototypes – beams, reinforced with basalt-plastic reinforcement, according to the available design standards of foreign countries, which were among the first to use non-metallic composite reinforcement for reinforcing span concrete structures. The methods of calculating the bearing capacity of beam elements for concrete and non-metallic composite reinforcement according to regulatory documents are examined in detail. A comparative analysis of the actual bearing capacity of inclined sections of basalt concrete beams and its calculated values calculated according to the recommendations of the existing design standards of foreign countries is carried out. The analysis showed that the actual bearing capacity of the inclined sections of basalt concrete beams and its calculated value showed their unsatisfactory convergence. A common feature of all considered foreign design standards is the underestimation, up to several times, of the bearing capacity of inclined sections of prototypes ‒ beams reinforced with both steel and basalt-plastic reinforcement. It has been established that the methods for calculating the bearing capacity of supporting sections of spans of reinforced concrete and basalt concrete structures, presented in national design standards, are based not on the new general method, but on partially improved methods that were used in previously existing standards.
Карпюк В., Карпюк І., Целікова А., Малахов В., Худобич А. Моделювання напружено-деформованого стану базальтобетонних балок У сучасному будівництві дедалі частіше застосовують неметалеву композитну арматуру (НКА). Вона має вищу міцність, кращі діелектричні властивості, малу вагу й не піддається корозії, все частіше замінює сталеву арматуру, особливо в будівлях спеціального призначення. Її застосування для армування бетонних конструкцій стримується недостатнім вивченням особливостей роботи таких елементів і обмеженим нормативним забезпеченням. Активніші темпи впровадження композитної арматури обмежені відсутністю достовірних методів розрахунку їхньої несучої здатності. Саме тому в статті автори моделюють напружено-деформований стан базальтобетонних балок з урахуванням спільної дії бетону й базальтопластикової арматури. Здійснено порівняльний аналіз фактичної несучої здатності похилих перерізів базальтобетонних балок і розрахункових її значень, обчислених за допомогою програмного комплексу « Ліра-САПР», подано результати моделювання напруженодеформованого стану базальтобетонних балок перед їхнім руйнуванням за впливу статичного навантаження. Проаналізовано прямі вимірювання прогинів, деформацій бетону і базальтопластикової арматури, а також узгоджених із ними ізополей переміщень і напружень в експериментальних зразках -балках -перед їхнім руйнуванням. Також наведено ізополя напружень у поздовжній та поперечній базальтопластиковій арматурі в балках із великим, середнім і малим прольотами зрізу, а також дотичні напруження на бічних гранях перед руйнуванням. Автори стверджують, що моделювання складного напружено-деформованого стану дослідних базальтобетонних балок нелінійними звичайно-елементними розрахунками за допомогою програмного комплексу «ЛІРА-САПР» дає змогу чисельно відтворити результати експериментів, найімовірнішу схему роботи та руйнування і достовірно спрогнозувати їхню несучу здатність.Ключові слова: неметалева композитна арматура, моделювання, несуча здатність, напруження, руйнування, базальтобетонна балка. Karpiuk V., Karpiuk I., Tselikova A., Malakhov V., Khudobych A. Simulation of stress-strain state of basalt concrete beamsNon-metallic composite reinforcement is increasingly used in modern construction. Non-metallic composite reinforcement has higher strength, better dielectric properties, low weight and does not corrode, increasingly replacing steel reinforcement, especially in special purpose buildings. Its use for reinforcement of concrete structures is constrained by insufficient study of the features of such elements and limited regulations. More active rates of introduction of composite armature are limited by lack of reliable methods of calculation of their bearing capacity. That is why in the article the authors provide modeling of the stress -strain state of basalt concrete beams taking into account the combined action of concrete and basalt -plastic reinforcement. A comparative analysis of the actual bearing capacity of inclined sections of basalt concrete beams and its calculated values are...
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