The diameter of transverse reinforcement of columns should be equal to one-fourth of the diameter of the main steel rods but not less than

ANS:D - 7 mm

The diameter of transverse reinforcement (ties or stirrups) in columns is an important aspect of reinforced concrete design, especially for confinement of the concrete core and to prevent buckling of longitudinal reinforcement. According to many building codes and design standards, the minimum diameter of transverse reinforcement in columns is typically specified to ensure adequate strength and durability. Among the options provided:

• 4 mm
• 5 mm
• 6 mm
• 7 mm
• 8 mm

The correct answer is: 7 mm Transverse reinforcement should have a minimum diameter of 5 mm, according to typical design standards. This ensures that the ties or stirrups provide sufficient strength and confinement to the concrete core of the column, especially during seismic events or other loading conditions.