Coastal and Floodplain Construction Inspector's Practice Exam

For a multi-story residential structure in a 100 mph wind zone, what is the maximum spacing of vertical reinforcements using 1 #5 rebar on a 10' length with 6" Concrete or Masonry?

1. 8 inches

2. 6 inches

3. 10 inches

4. 12 inches

The correct answer is: 6 inches

In a multi-story residential structure located in a 100 mph wind zone, the requirements for vertical reinforcement spacing are particularly critical to ensure the structural integrity of the building against lateral forces such as wind. The International Building Code (IBC) and various engineering guidelines dictate that vertical reinforcements must be spaced closely enough to resist these forces effectively. Using #5 rebar, which has a diameter of 5/8 inch, the proper maximum spacing for vertical reinforcement should not exceed 6 inches for standard applications in high wind zones. This spacing helps to maintain adequate strength and stiffness in the structural elements, preventing excessive deflection or failure under lateral loads. Specifically, closer spacing of reinforcements enhances the overall ductility and load-carrying capacity of the concrete, which is paramount in regions exposed to high winds. Other spacing options, such as 8, 10, or 12 inches, would not meet the necessary structural requirements for resistance to lateral forces in such high wind conditions. This is why the answer indicating a maximum spacing of 6 inches is the most appropriate choice for ensuring the safety and durability of the structure.