Abstract
Abstract. scanner provides the ability to detect the geometric 3D model of a building without any physical contact with the structure. Knowledge of the 3D model will give the opportunity to study the deformation and quantify the damages. Three case studies are presented relating to damaged and/or unsafe buildings: Sivillier Castle (Villasor - Sardinia- Italy), the Bell Tower of Mores (Sardinia-Italy) and industrial building (Cagliari - Italy). The first two cases concern buildings of historical and architectural importance that present a state of compromised conservation; the last, an industrial building compromised by fire. In all cases, a laser scanner survey was carried out that not only provided valuable information but also highlighted structural metric deformation and degradation.
Highlights
The monitoring of building structures have an increasingly important role in the engineering field, above all because they are concerned with the impact that such structures have in the area where they were built
Among all the geomatic techniques, that have some of these characteristics, there are the following: measurement with Total Stations, measurement with Global Navigation Satellite System (GNSS) technology, close range photogrammetry and Terrestrial Laser Scanning
There follows a brief description of these techniques: 1. Classical survey with Total Stations is widespread for the accurate measuring of a limited number of accessible or inaccessible points
Summary
The monitoring of building structures have an increasingly important role in the engineering field, above all because they are concerned with the impact that such structures have in the area where they were built. By way of the digital images obtained, the scansion is completed with RGB information of the object scanned; allowing for the integration of the analyses of the structure, e.g., those referring to the degrade of the building materials. 3.1.0 (335), of Gexcel Ltd. Reconstructor is a software that enables the carrying out of all the processing operations of the point cloud until the 3D model of the structure or building scanned is obtained. Once the scansions of the software have been loaded, they undergo ‘cleaning’ by way of the application of a series of algorithms that extract the information needed for the successive phase of data processing With this procedure, known as pre-processing, operations are carried out which focus on noise reduction, the calculation of the normal vectors, the determining of the outlines, and the calculation of confidence; values that enable the assessment of the measurement reliability on each single point. The effects of extreme actions like blast load or fire is the subject of a current research trend (see for example [4] [5] [6] [8]), and the information obtained from a geomatic survey can be of paramount relevance in the structural analysis [2] [3]
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