Keywords: conservation, rehabilitation, three-dimensional modelling.

This paper presents the use of three-dimensional geometric models to the rehabilitation of two situations: in one case, an historic building was submitted to a rehabilitation process that includes the detection of structural anomalies, the replacement of damaged resistant elements and the adaptation of the building to new services; in the second case, a new sanitary equipment on a bathroom was installed in a old building presenting a significant degree of degradation. In both situations, the three-dimensional models were created in order to better understand the geometry of the environment where the rehabilitation is going to take place, to quantify the amount of work needed and to evaluate different alternative options of rehabilitation.

A masonry building from the nineteenth century located in the centre of Lisbon, is used as a case study [1]. The model of this building is then created in order to better describe its structural organization and anomalies and to evaluate different structural rehabilitation choices. Each damage found was classified, the respective area or volume was identified on the model and the adequate type of rehabilitation work was defined. It was found that the masonry over spans of the doors was cracked in two areas. In two walls made of wood elements filled with masonry, fungi grew, attacked the wood and led to its rot. Several wooden beams of the first floor were profoundly damaged by rot and others were being attacked by insects. In the building a new stairway was constructed from the first to the second floor to solve a functional problem. The structure is supported by pillars, beams and slabs also made of concrete. Another option was studied and modelled. The solution presented is a steel structure with four spans. The three-dimensional model was used alongside photographs to make a comparison between the final aspect of the solution executed on site and the proposed alternative.

The second study is an urban building constructed in the 1950s [2]. The exterior walls are masonry structural elements and the interior walls are made of wood elements filled with masonry. The space to rehabilitate is a bathroom located on the first floor, with an area lesser the standardized one and the local does not meet current requirements and functional health. Two solutions were worked out and modelled. The understanding of the organization of the interior space shown by the models is quite clear, better then just analysing plan drawings.

This paper is a contribution to the acceptance of the use of CAD, not only as a good drafting tool, but also to provide an important support to the analyses of rehabilitation works.

1

J.G. Neves, "Rehabilitation of ancient buildings using 3D models as a tool", MD thesis, Technical University of Lisbon, Lisbon, Portugal, October 2008.

2

B. Martins, "Building rehabilitation support on 3D modelling: Insertion of sanitary equipment in a house", MD thesis, Technical University of Lisbon, Lisbon, Portugal, November 2008.

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