Composite construction is the most common structural system for elevated floors. It consists of concrete placed on metal decking that's supported by structural steel beams and girders. As the concrete hardens, the steel framing and concrete bond together to carry dead and live loads. Until the concrete hardens, however, the framing and metal deck must carry construction loads that include the weight of the fresh concrete. This weight can result in floor deflection and levelness problems.
To help contractors minimize these problems, article presents four methods for controlling the deflection of composite slabs:
- Increase the beam or girder sizes or both to reduce construction deflection.
- Camber the steel beams or girders or both.
- Place additional concrete to compensate for the deflection.
- Shore the beams or girders or both.