In history of timber carpentries, great interest comes out of Swiss covered bridges from a technological as well as a structural point of view. Beyond the numerous testimonies of such still existing works, acquaintance of the most important realization is offered by the consultation of handbooks on carpentry, like those of Krafft (1805) and Emy (1841), and by widespread works as Rondelet’s treatise (1810). The bridge object of the present study constitutes a singular case as it is reproduced by some treatise writers as a bridge realized in the city of Wettingen, on Limmat River, but in truth it was never constructed. It is instead only the first design, set aside later on, proposed by Hans Ulrich Grubenmann for Rein River crossing at Schaffahausen. The interest for such design is motivated by the extremely dared structural conception: the potentialities of the structural scheme composite with struts arranged in the vertical surface aside of the track, already adopted in many illustrious examples of the past, come exalted through the connection of such structures with those of the covering central skeleton, realizing an effective spatial scheme. A calculation scheme, based on the reproductions of the original design, and on a precise reconstruction of technological solution adopted at the end of eighteenth century in Switzerland, has been conceived to verify the reliability of this design which, with a free span of about 120 m, represents the attainment of a limit never equalled.

THE SWISS COVERED TIMBER BRIDGES OF XVIII CENTURY

CERALDI, CARLA;
2003

Abstract

In history of timber carpentries, great interest comes out of Swiss covered bridges from a technological as well as a structural point of view. Beyond the numerous testimonies of such still existing works, acquaintance of the most important realization is offered by the consultation of handbooks on carpentry, like those of Krafft (1805) and Emy (1841), and by widespread works as Rondelet’s treatise (1810). The bridge object of the present study constitutes a singular case as it is reproduced by some treatise writers as a bridge realized in the city of Wettingen, on Limmat River, but in truth it was never constructed. It is instead only the first design, set aside later on, proposed by Hans Ulrich Grubenmann for Rein River crossing at Schaffahausen. The interest for such design is motivated by the extremely dared structural conception: the potentialities of the structural scheme composite with struts arranged in the vertical surface aside of the track, already adopted in many illustrious examples of the past, come exalted through the connection of such structures with those of the covering central skeleton, realizing an effective spatial scheme. A calculation scheme, based on the reproductions of the original design, and on a precise reconstruction of technological solution adopted at the end of eighteenth century in Switzerland, has been conceived to verify the reliability of this design which, with a free span of about 120 m, represents the attainment of a limit never equalled.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11588/3153
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