Abstract
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 O14 A500C for reinforced concrete beams and 2 O14 BFRP (AKB800) for basalt-concrete beams. Transverse reinforcement consisted of 2 O3,4,5 ВрI for reinforced concrete beams and 2 O4,6,8 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
Highlights
In recent decades, structures with non-metallic composite reinforcement (NCR) are increasingly used in construction practice, especially in special-purpose buildings and structures.Due to high strength, resistance to chemical and physical corrosion, dielectric and diamagnetic properties, low weight, and low thermal conductivity, NCR is increasingly replacing steel reinforcement
The study results have shown that BFRP meets the requirements of CSA 5807-10 in terms of their physical and mechanical properties
The studies have allowed us to establish a qualitative and quantitative picture of deformation, crack formation, and failure of experimental beams presented in a form of experimental-statistical dependences under the action of one-time static and low-cycle reloading
Summary
Structures with non-metallic composite reinforcement (NCR) are increasingly used in construction practice, especially in special-purpose buildings and structures. Resistance to chemical and physical corrosion, dielectric and diamagnetic properties, low weight, and low thermal conductivity, NCR is increasingly replacing steel reinforcement. BFRP has unique physical and chemical properties, in particular, improved chemical resistance to corrosive media compared to glass fiber reinforced plastic (GFRP). A series of plants are already producing high-quality basalt-plastic reinforcement. Production of such reinforcement is less harmful to the environment compared to the steel one. Study of the load-bearing capacity of structures with basalt-plastic reinforcement in order to accumulate a data bank, improve existing and develop new normative documents that would ensure wider use of such reinforcement in these areas of construction and at special-purpose facilities is an important and urgent problem. Applied mechanics conditions make it possible to take into account a decrease in NCR strength properties because of the long-term action of loads and uneven distribution of stresses
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