Stability control of an historical structure with TLS survey

In this paper we present the preliminary results of a study aimed to assess the stability of a complex historical structure such as the Anatomy Theatre. The construction occupies the two upper floors on the north west side of Palazzo del Bo’, the building seat of the University of Padua. The Anatomy Theatre is certainly one of the oldest, most important and best-known historical “medical” buildings. Built in 1594, the Theatre was the first permanent structure of its kind and substituted for the temporary theatres which were set up when necessary. The main goal of this work is to verify the stability over the time of this kind of structure, given the inherent organic decay of the wooden parts. Although this task could be performed with classical surveying methods, a long-range terrestrial laser scanner (Leica HDS 3000) was employed. This choice was dictated by considering the numerous measurement benefits offered by TLSs, such as three-dimensional data capture, remote and noncontact (i.e. targetless) operation and dense data acquisition. The presented work is part of a wider project aimed not only at the checking of the structure stability but also at the structural assessment through the use of finite element model. In the paper we will present the preliminary results obtained from the repeated checks and highlight issues and difficulties related to the laser scanning of an unusual geometry such as the one provided by the Anatomy Theatre of the University of Padua.