Red Seal Ironworker (Reinforcing) Practice Exam

According to design specifications, what is the maximum spacing for vertical stirrups in beams?

1. 8 to 10 inches

2. 10 to 12 inches

3. 12 to 16 inches

4. 16 to 20 inches

The correct answer is: 12 to 16 inches

The maximum spacing for vertical stirrups in beams is critical for maintaining the structural integrity and performance of the beam under load. Stirrups are used to provide shear reinforcement, preventing shear failures that could compromise the safety and reliability of the structure. In many design specifications, the maximum spacing is often stipulated to ensure that the stirrups effectively help hold the main reinforcement bars in place while also resisting shear forces. Spacing of 12 to 16 inches is typically compatible with both building codes and best practices in reinforced concrete design. This range allows enough stirrup placement to resist applied shear forces while providing sufficient concrete coverage around the main bars to guard against issues like buckling or potential failure modes. Maintaining this spacing also aids in ensuring proper concrete flow during pouring, which contributes to the overall strength of the beam. Thus, the choice indicating 12 to 16 inches aligns with commonly accepted guidelines and engineering practices, making it the most suitable answer.