Suspended roof for the Värnamo roof palace
DOI:
https://doi.org/10.3989/ic.1964.v17.i160.4556Abstract
The new sports palace at Värnamo, Sweden, has been provided with a roofing structure using the «Jawerth» system of prestressed cables. This method is ideal for the construction of roofs covering very large spans. Although the structural element is a cable considerable stiffness and stability is achieved, even under large temperature variations. The method involves a series of pairs of cables, each acting as a single structural and stable load carrying element In each pair, the top cable is curved so that it is concave towards the top, whilst the lower cable is concave downwords These two mam cables are connected by a third cable, which forms a number of triangles with the other two On stretching the cables, the whole becomes a loadbearing structure of adequate stiffness. The two main cables adopt a polygonal outline, and their loads can be calculated. This constructive method, applied to the roof of the Värnamo sports palace, has proved very satisfactory. In this particular case the fixing of the cables has required 0.285 working hours per square metre of roof structure and the stretching has been accomplished with a hand operated capstan. A number of extensometers and electrical recording units has made it possible to know at all stages of the operation the loading of the cables, and the position of the cable with respect to its final theoretical position.
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