14th Crisp user meeting at UCL1 Some observations on the use of swap elements in staged construction Anthony Swain Professor of Transport Infrastructure Engineering Department of Civil and Environmental Engineering University College London Gower Street, London WC1E 6BT

14th Crisp user meeting at UCL2

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4 With renumbering Without renumbering

14th Crisp user meeting at UCL5 With renumberingWithout renumbering

14th Crisp user meeting at UCL6 With renumberingWithout renumbering

14th Crisp user meeting at UCL7 With renumberingWithout renumbering

14th Crisp user meeting at UCL8 With renumberingWithout renumbering

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14th Crisp user meeting at UCL11 Conclusions It is imperative that construction sequence and details are known when modelling staged construction Significant differences can result for the same problem, with and without node renumbering More than one area of a problem needs to be cross- checked when determining the reliability of a model The facility to gain access to and understand the internal architecture of a code is becoming increasingly important