Author: The Concrete Centre
5 January 2015
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The Concrete Centre
Strut-and-tie modelling is a simple method of modelling complex stress patterns in reinforced concrete as triangulated models. It is based on the same truss analogy as the design for shear in Eurocode 2 and can be applied to many elements. It is particularly useful where normal beam theory does not apply, i.e. where plane sections do not remain plane, e.g. in deep beams, corbels and pile caps. EC2 provides information about the use of strut-and-tie modelling and this article is an introduction for engineers who want to take advantage of this useful analysis method.
The concluding article in this series discusses the span-to-effective-depth method for verifying deflection limits of slabs and beams. (This article was corrected on 1 October 2015. For details, see the corrigendum published on page 37 of the October 2015 issue.)
The design for horizontal actions, fire and materials is considered, along with simplified methods of design. Throughout this article the Nationally Determined Parameters (NDPs) from the UK National Annexes have been used. These enable Eurocode 6 (BS EN 1996-1-1) to be applied in the UK.