Please use this identifier to cite or link to this item: https://hdl.handle.net/10216/92136
Author(s): Elsa de Sá Caetano
Rastislav Bartek
Filipe Magalhães
Chris Keenan
Glyn Tryppick
Title: Assessment of cable forces at the London 2012 Olympic Stadium roof
Issue Date: 2013
Abstract: The London 2012 Olympic Stadium roof was constructed as a cable net covered bya flat PVC-coated polyester fabric membrane supported by an oval compressiontruss and an inner tension ring. As part of the geometric and mechanical controlof the constructed structure, the forces installed in the most relevant cables wereassessed using the vibration method. Particular characteristics of these cables,such as the flexibility of anchorages, the short length, low tension and bendingeffects were among the difficulties found, preventing the direct application ofthe vibrating chord formula to estimate force on the basis of measured naturalfrequencies. In order to reduce as much as possible the errors in force estimates,a methodology combining numerical finite element modeling with experimentaltesting was applied. This comprehended in particular the modeling of the cableswith adjustable rotational springs, the corresponding constants being fitted on thebasis of the measured natural frequencies. This paper describes the methodologyapplied in the identification of force in different conditions, showing that thecombination of high-quality vibration measurements with finite element analysis of individual cables can provide a robust and powerful identification tool inmany situations where the vibrating chord theory fails. Furthermore, the differences of pre-stress to theoretical values are characterised and discussed in faceof the sensitivity of structural members to fabrication and erection tolerances.
Subject: Engenharia civil, Engenharia civil
Civil engineering, Civil engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia civil
Engineering and technology::Civil engineering
URI: https://repositorio-aberto.up.pt/handle/10216/92136
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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