Temporary Works Toolkit. Part 4: An introduction to backpropping of flat slabs
Backpropping of concrete slabs during construction is a subject often misunderstood in the industry. Regrettably, many permanent works designers (PWDs) still consider the subject as “not relevant and a contractor’s issue”.
This article explains the theory and background to backpropping and gives advice on the methods recommended to be adopted for backpropping calculations. It looks at the physics involved and how engineers and designers can mitigate damage to concrete slabs during construction. A second article, giving worked examples, with solutions to reduce overloading flat slabs during construction, will follow in the January 2017 issue.
Author(s): P. Pallett (Pallett TemporaryWorks Ltd)