Q1: Pick up the incorrect statement from the following: Tensile reinforcement bars of a rectangular beam

ANS:C - are bent down at suitable places to serve as shear reinforcement

In reinforced concrete beam design, shear reinforcement is crucial for resisting the shear forces that develop within the beam. Shear forces occur perpendicular to the longitudinal axis of the beam and can cause diagonal tension cracks, ultimately leading to beam failure if not adequately addressed. Shear reinforcement is commonly provided in the form of stirrups or bent-up bars. Stirrups are typically placed perpendicular to the longitudinal reinforcement and are spaced along the length of the beam to resist shear forces effectively. These stirrups help to confine the concrete within the beam, prevent diagonal cracking, and enhance the beam's shear capacity. Bending down the tensile reinforcement bars to serve as shear reinforcement is not a standard practice in reinforced concrete beam design. Tensile reinforcement bars are primarily intended to resist bending moments, not shear forces. Bending down the bars would not effectively enhance the beam's shear capacity and may compromise the structural integrity of the beam. Therefore, while it's essential to provide adequate shear reinforcement in reinforced concrete beams, bending down the tensile reinforcement bars for this purpose is not a conventional or recommended approach. Instead, dedicated shear reinforcement elements such as stirrups or bent-up bars are used to effectively address shear forces in reinforced concrete beam design.