The main reason for providing number of reinforcing bars at a support ...
Reinforcing bars are provided at the support to develop adequate bond between concrete and steel, so that adequate bond stress is developed between them within development length.
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Reinforcing bars are provided in a simply supported beam at a support to resist bond stress.
Explanation:
Bond stress is the stress developed between the steel bars and the concrete. It is the stress required to transfer the load from the steel bars to the concrete. In a simply supported beam, the bars near the supports are subjected to high bond stress due to the bending moment and shear force acting at the supports. The bond stress is maximum at the supports and decreases towards the mid-span of the beam.
The main function of the reinforcing bars is to provide tensile strength to the concrete. But in the case of simply supported beams, the bars are mainly provided to resist the bond stress. The bars are placed in the tension zone of the beam near the supports to increase the bond strength between the steel bars and the concrete. The bond strength is important to transfer the load from the steel bars to the concrete.
The bars are provided in a horizontal and vertical direction to resist the bond stress. The horizontal bars are provided to resist the shear stress and the vertical bars are provided to resist the bending moment. The bars are placed at a distance of 2d from the face of the support where d is the effective depth of the beam.
In summary, the main reason for providing reinforcing bars at a support in a simply supported beam is to resist the bond stress between the steel bars and the concrete.
The main reason for providing number of reinforcing bars at a support ...
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