The structural behaviour of hybrid reinforced concrete beams of trapezoidal section was investigated in this work. The main aim of study was to investigate the interaction effect of hybrid concrete compressive strength–section geometry variations on beam strength characteristics. The experimental programme included fourteen simply supported reinforced concrete deep beams being prepared and examined under a four-point load setting protocol. All specimens were of 1,000 mm length and of equal cross-sectional area. The specimens were divided into groups according to section shape variations and hybrid compressive strength considerations. Various concrete compressive strengths (70, 50, and 25) MPa were considered, and three different trapezoidal geometries of different alignment side angles (75°, 80°, and 85°) were also adopted, along with two steel rebar ratios (0.008617 and 0.01508). Generally, the experimental results showed that the shear strength capacity increased with increases in the area of high-strength concrete in the compression zone in increments, with improvements ranging from 3.66% to 8.63% as compared to reference specimens of uniform section (rectangular section); the diagonal crack load decreased, however. It was also observed that the hybrid concrete created high ductile behaviour, and the significant failure mode was shear mode without slippage of the hybrid concrete layers. A comparison of results with the hybrid strength reduction index (Ψ=f’cb/f’ct ) showed that as Ψ decreased from 0.714 to 0.357, the average rating varied between 1.15 and 1.22 with respect to rectangular specimens and from 1.07 to 1.13 with respect to trapezoidal sections of uniform strength. An optimum alignment side angle for trapezoidal configuration also appears to be indicated, with the best results for all hybrid strength-trapezoidal sections in specimens where Ө=80°.
The structural behavior of the hybrid reinforced concrete beams of the trapezoidal section is investigated in this paper. This study aims mainly to investigate the interaction effect of hybrid concrete compressive strength for section has geometry variation upon beam strength characteristics. Throughout the considered experimental program, 10 simply supported reinforced concrete beams were prepared and tested using a four-point load setting. All specimens had equal cross-sectional area. These specimens were divided into two groups, each group contain 5 beams. The first group deals with flexural behavior and the second group concerned with shear behavior. In addition to hybrid compressive strength considerations, two types of concrete with different compressive strengths of (25 and 50 MPa) were used and three trapezoidal geometries with different alignment side angles (75, 80, and 85) are adopted. The experimental testing showed that the effectiveness of the hybrid trapezoidal force formation maintained the strength of the samples decreased more than the hybrid effect force. As for the flexural behavior, the ultimate strength decreased by (2.82%) and the deflection increased by (56.81%) with respect to rectangular specimens. For shear behavior, the ultimate load was close or identical to the control specimens with deflection increment ranging from (9% to 60%) with respect rectangular specimen. The effect of area distribution within section (section shape sides orientation) was clearly on the first crack load where the angle (80) recorded a highest value of crack load.
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