Abstract
This paper describes the rehabilitation procedure of the roof timber structure of a multiuse pavilion in Viseu, Portugal. The roof structure consists of a series of parallel double timber trusses, partially concealed above a polyhedral wooden plank-made ceiling. Recently, the support of one of the trusses failed and another one has been assessed as in a pre-failure condition. Some load-redistribution and the prompt shore of the structure prevented the generalized collapse. The subsequent inspection and assessment led to the conclusion that the primary cause of the collapse was the failure perpendicular to the grain of the solid timber elements inserted between the double rafters and tie-beams. The replacement of the existing with a steel structure, and the repair and reinforcement of the existing wooden trusses, were considered as intervention possibilities. The latter revealed much cheaper, less time-consuming and in line with the international recommendations on rehabilitation works, and was therefore adopted. An innovative solution, consisting of the replacement of the central timber elements in all the supports, resulted in minimum visual impact and improved the load bearing capability beyond its original value. Doi: 10.28991/cej-2020-03091628 Full Text: PDF
Highlights
IntroductionSteel elements (e.g. plates) may be used in traditional dry connections to restore the continuity between two parts of a timber element; The connections may be made up with either connectors or structural adhesive bonding (...); (Final and) intermediate execution procedures to assess the intervention results should be defined
A strong shift occurred on the philosophy underneath the rehabilitation/refurbishment works in ancient structures
The heritage issues have been a concern and topic of research and reflection ever since, and some countries with large and sensitive historical and architectural heritage issued standards on rehabilitation of wood structures [2,3,4] and others, based on those recommendations, as a way to force them into practical application
Summary
Steel elements (e.g. plates) may be used in traditional dry connections to restore the continuity between two parts of a timber element; The connections may be made up with either connectors or structural adhesive bonding (...); (Final and) intermediate execution procedures to assess the intervention results should be defined. Most research work in this area is focused on the mechanics and stress distribution in the joint interfaces [9,10,11] or its behavior under seismic action [12, 13], as the low ductility and poor performance of these connections raise concerns from this point of view. It must be underlined, that none of the usual failure modes described above was the cause for the present collapse, and that is what makes this case study so particular
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