Study of strength, deformability property and crack resistance of beams with BFRP

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 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

Effectiveness of Strengthening of Reinforced Concrete Beams With the Use of Composite Materials

“…Qualitive and quantitive deformation picture, as well as tendency of crack formation and failure process was presented. Corresponding reliable experimental-statistical dependences were presented and approved (Karpiuk et al, 2020).…”

Determining the effect of reinforcing a cement-concrete coating of bridges on the stressed-strained state of structures

“…The authors of [13] focus on the impact of structural factors on the nature of changes in the patterns of bearing capacity, crack resistance, and deformations of concrete structures using BFRP. It should be noted that the cited papers [2,[11][12][13] do not give algorithms for determining the components of the stressed-strained state of structures reinforced with composite materials.…”

“…Our review of the above studies [2][3][4][5][6][7][8][9][10][11][12][13] indicates a high scientific interest in this issue. However, it should be noted that scientists have not sufficiently investigated the impact of FRP-reinforcement of cement-concrete coating of bridges on the stressed-strained state of the structure in general.…”

Design Models of the Bearing Capacity of the Support Sections of Basalt-Concrete Beam Structures

“…Analysis of recent sources of publications. Comparison of experimental data [1,2] with the results of calculations [3] of load-bearing capacity of inclined sections of structures with FRP according to European EUROCODE-2 [4], Japanese JSCE [5], American ACI [6], Canadian CSA [7], Italian CNR [8] design standards showed unsatisfactory convergence (coefficients of variation ( %) 59 85    because they are based not on real physical schemes of such structures, but on the classical model of truss analogy W.Rittier -E.Mörch and its various modifications, arched analogy or a combination of truss and arched analogies.…”

“…1 Кравчук В.Г., студент, kravchukvadim010995@gmail.com, ORCID: 0000-0002-2586-4978 1 Одесская государственная академия строительства и архитектуры ул. Дидрихсона, 4, г. Одесса, 65029, Украина Аннотация.…”