What anchors the joist tracks in steel frame construction?

In steel frame construction, joist tracks are anchored using a clip angle. Clip angles serve as brackets that connect the joist tracks to the supporting steel framework, providing stability and ensuring that the joists remain securely in place during and after installation. This connection is crucial for maintaining the integrity of the structure, as it helps distribute loads and resist lateral forces.

The use of clip angles is prevalent because they allow for quick and efficient installation while ensuring a strong mechanical connection. Their design allows for easy attachment to both the joist track and the supporting elements, which is essential for maintaining alignment and supporting the weight of the building's floors or ceilings.

The other options, such as anchor connectors, backing rods, and sill ties, have different functions in construction. Anchor connectors are typically used for connecting various structural elements in a way that allows for movement; backing rods are often used in sealant applications; and sill ties assist with the anchoring of wall assembly to foundation systems. Therefore, their roles do not pertain to the anchoring of joist tracks specifically.