Shear Performance of Hybrid Concrete Deep Beams of Trapezoidal Section

Abstract The structural behaviour of hybrid reinforced concrete beams trapezoidal section was investigated in this work. main aim study to investigate the interaction effect compressive strength–section geometry variations on beam strength characteristics. experimental programme included fourteen simply supported deep being prepared and examined under a four-point load setting protocol. All specimens were 1,000 mm length equal cross-sectional area. divided into groups according shape considerations. Various strengths (70, 50, 25) MPa considered, three different geometries alignment side angles (75°, 80°, 85°) also adopted, along with two steel rebar ratios (0.008617 0.01508). Generally, results showed that shear capacity increased increases area high-strength compression zone increments, improvements ranging from 3.66% 8.63% as compared reference uniform (rectangular section); diagonal crack decreased, however. It observed created high ductile behaviour, significant failure mode without slippage layers. A comparison reduction index ( ?=f’ cb /f’ ct ) ? decreased 0.714 0.357, average rating varied between 1.15 1.22 respect rectangular 1.07 1.13 sections strength. An optimum angle for configuration appears be indicated, best all strength-trapezoidal where ?=80°.