Experimental Study on the Effects of Stirrup Spacing, Diameter, and Inclination Angle on the Flexural Strength of Reinforced Concrete Beams

Sudarno P Tampubolon; Medyawanti Pane

doi:10.55927/fjst.v5i9.166

Authors

Sudarno P Tampubolon Universitas Kristen Indonesia
Medyawanti Pane Universitas Kristen Indonesia

DOI:

https://doi.org/10.55927/fjst.v5i9.166

Keywords:

Experimental, Reinforced Concrete Beams, Crack, Flexural Strength.

Abstract

Reinforced concrete beams are essential structural elements that resist and transfer loads; therefore, their flexural performance and deformation capacity are important considerations in structural design. One of the factors affecting beam behavior is the configuration of shear reinforcement, particularly the diameter, spacing, and inclination angle of the stirrups. This study aims to investigate the effects of variations in stirrup diameter and configuration on the flexural strength and deflection of reinforced concrete beams. An experimental investigation was conducted through laboratory testing of four reinforced concrete beam specimens (B1–B4) with different stirrup diameters and configurations. The specimens were subjected to flexural loading until failure, with load, flexural strength, and deflection recorded as the primary parameters. The results showed that the flexural strength of beams B1, B2, and B3 was 71.01 MPa, whereas beam B4 achieved 52.07 MPa. Beam B1, reinforced with D8 stirrups spaced at 100 mm and an inclination angle of 45°, exhibited a deflection of 56.4 mm at a load of 75 kN. In comparison, beam B3, reinforced with D6 stirrups at an inclination angle of 90°, exhibited a deflection of 75.5 mm under the same load. The maximum deflection of 75.5 mm was observed in beam B3. These findings indicate that variations in stirrup diameter and configuration affect the deformation response of reinforced concrete beams, with D8 stirrups inclined at 45° resulting in lower deflection than D6 stirrups at 90° under the same stirrup spacing

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