Which system requires a stirrup as part of its construction?

The stirrup is a crucial component in various construction systems as it provides lateral support and helps maintain the integrity of the structural elements. In the context of this question, the stirrup is utilized in the construction of the waffle-grid system, flat wall system, and screen-grid system.

In the waffle-grid system, stirrups are essential for reinforcing the concrete elements and providing the necessary support at intersections where beams and slabs meet. This system relies on a grid pattern that distributes loads effectively, and stirrups help resist shear forces.

Similarly, in the flat wall system, stirrups may be employed within the walls to ensure they can withstand lateral loads and provide stability, particularly in areas where walls are subjected to bending and shear stresses.

The screen-grid system, which often combines elements of both waffle and flat wall systems, also incorporates stirrups to enhance its structural performance, allowing for better load distribution and increased strength.

By stating that all of these systems require a stirrup, it highlights the important role that this component plays across different types of construction methodologies, reinforcing their reliability and safety standards.