Author: H. J. Darby (Peter Brett Associates LLP and University of Reading), F. Kelly (Peter Brett Associates LLP), A. A. Elmualim BSc (ICIOB University of Reading)
30 November 2012
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H. J. Darby (Peter Brett Associates LLP and University of Reading), F. Kelly (Peter Brett Associates LLP), A. A. Elmualim BSc (ICIOB University of Reading)
The twisting of elements within structures due to eccentric loading is something that is best avoided as far as is possible. Such actions develop torsion forces in elements against which they were not designed to withstand. This Technical Guidance Note concerns this buildability and detailing issue that structural engineers must become familiar with in order to avoid otherwise unforeseen problems that can lead to significant remedial works on site and in some cases failures.
The importance of accurate information and interpretation of soil conditions on a site cannot be understated. The chosen form of any sub-structure is entirely dependent upon what the site investigations have revealed. It is typically up to the structural engineer, with the aid of geotechnical engineers and specialists, to determine the extent of this investigation and interpret its results. This Technical Guidance Note explains the various methods of site investigation and can be considered a partner to the previously published note on 'soil bearing capacity'.
While the advancement of computer based analysis continues to grow exponentially within the field of structural engineering, the tools that are used to analyse structures by hand are no less relevant. Many would argue that such tools are even more vital today than they have ever been if we are to fully understand the output of analysis applications. With this in mind, this Technical Guidance Note describes one of the most powerful analysis tools available: moment distribution. Moment distribution is a method by which statically indeterminate structures are analysed elastically. It’s based on the relative stiffness of elements that make up a structure and shifts bending moments from one section of the structure to another until they become balanced. Once this balance has been achieved, the forces and bending moments within the structure are modelled. (This article was updated in October 2016 to reflect errata issued since its original publication.)