NCIDQ IDFX Practice Exam

In a concrete joist system, how are joists arranged?

1. Randomly for aesthetic reasons

2. In a parallel configuration

3. In a circular pattern

4. In a diagonal layout

The correct answer is: In a parallel configuration

In a concrete joist system, the joists are typically arranged in a parallel configuration. This arrangement provides several structural advantages. By aligning the joists parallel to each other, the load distribution is more efficient, allowing for better structural integrity and performance under load. The parallel layout also facilitates easier installation of flooring systems, makes the overall construction process more straightforward, and adheres to standard construction practices that maximize the effectiveness of the material and design. Arrangement in parallel allows for fewer structural elements than more complex configurations, which can reduce costs and labor. Additionally, maintaining this arrangement increases the uniform support of loads, which is crucial in ensuring that the floors above remain level and stable. Other arrangements, such as circular patterns or diagonal layouts, would not typically provide the same level of effectiveness in load distribution or structural efficiency and are less common in standard construction practices for joist systems. Random arrangements might complicate construction and compromise the load-bearing capabilities of the system, making parallel configuration the most logical and effective choice.