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Effect of ring beam stiffness on behaviour of reticulated timber domes
Civil Engineering Group, Department of Applied Physics and Electronics, Umeå University.
Civil Engineering Group, Department of Applied Physics and Electronics, Umeå University.
2005 (English)In: International Journal of Space Structures, ISSN 0956-0599, Vol. 20, no 3, 143-160 p.Article in journal (Refereed) Published
Abstract [en]

Domes are efficient structural systems for long clear-span buildings. The introduction of laminated timber highlighted the economic advantages of this material and led to the use of timber domes even for very large spans. In this paper, reticulated timber domes of triangular network shape with decking and bottom tension ring are considered. These types of domes have high stiffness in all directions along the surface and are kinematically stable. The dome is subjected to uniformly distributed load over the entire structure. The dome model is generated with a preprocessor program called DOME-IN and analysed with ABAQUS. The focus of this paper is to evaluate the behaviour of reticulated timber domes with respect to different stiffnesses of the bottom ring beam, here defined as a non-dimensional ring beam area parameterr*, which is shown to be a very well adapted design parameter for the ring beam. As far as global buckling is concerned, the critical pressure is sensitive to the bottom ring beam stiffness only if the latter is within a certain range. In terms of design, the stiffness of the ring beam should exceed A 2* > 2 in order to utilise the full buckling load capacity of the dome system itself. The maximum deflection, normal forces and bending moments versus the ring beam area parameter are also evaluated. The maximum values of the deflection and the internal actions next to the bottom ring are very sensitive to the bottom ring beam stiffness only if the latter is less than about Ar* < 10. A recommended value for the design of the bottom ring beam is Ar* > 20.

Place, publisher, year, edition, pages
2005. Vol. 20, no 3, 143-160 p.
National Category
Other Materials Engineering
Research subject
Wood Science and Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-65331DOI: 10.1260/026635105775213818Scopus ID: 2-s2.0-29844446420OAI: oai:DiVA.org:ltu-65331DiVA: diva2:1136161
Available from: 2017-08-25 Created: 2017-08-25 Last updated: 2017-11-24Bibliographically approved

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