Author: The Institution of Structural Engineers
25 June 2013
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The Institution of Structural Engineers
This guidance note pays particular attention to partial factors with reference to BS EN 1990: Eurocode – Basis of structural design, to illustrate how extreme events are approached within a code of practice, and explains how the code interprets the application of loads/actions for the design of structures for such events.
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.)
When analysing structures it is important to adopt a methodical approach wherever possible. By breaking down the structure into manageable portions, the complexity of the analysis is reduced and thus becomes easier to control and review. By adopting such an approach, a seemingly insurmountable task becomes a much more approachable one. This Technical Guidance Note is a good practice guide for analysing and designing structures. It explains how structures are given form, modelled, analysed and designed. Mention is made of the need to rationalise the analysis process, but not at the expense of an economic design.