Backpropping of concrete slabs during construction is a subject often misunderstood in the industry. To address this, last month’s article in the series covered the theory and detailed methods recommended for calculating backpropping loads, based on research carried out for the European Concrete Building Project (ECBP) and published by the Building Research Establishment (BRE).
This article continues by discussing some of the design issues and preconceptions related to backpropping, and gives worked examples.