Red Seal Ironworker (Reinforcing) Practice Exam

What is the primary purpose of using stirrups in reinforced concrete beams?

1. To provide tensile strength to the concrete

2. To provide shear resistance and hold vertical bars in place

3. To enhance the aesthetics of the construction

4. To reduce the weight of the concrete structure

The correct answer is: To provide shear resistance and hold vertical bars in place

The primary purpose of using stirrups in reinforced concrete beams is to provide shear resistance and hold vertical bars in place. Stirrups are closed loops of reinforcement bars that are placed around the main vertical reinforcement (the bars typically responsible for tensile strength) within a concrete beam. Their function is crucial in helping to absorb shear forces that occur in the beam, particularly in areas near supports where higher shear stresses are present. By holding the vertical bars in position, stirrups ensure that the tensile reinforcement works effectively with the concrete and does not shift during the pouring and curing process. This stability is vital for the structural integrity of the beam, preventing potential failures due to shear stresses. Overall, the inclusion of stirrups contributes to the safety and durability of reinforced concrete structures, making them an essential component in construction.