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- Aktive Thermografie (7)
- Monitoring (6)
- Non-destructive testing (5)
- Historic masonry (4)
- Active thermography (3)
- Cultural heritage (3)
- Masonry (3)
- Photogrammetrie (3)
- Radar (3)
- 3D-Laserscanner (2)
Non-destructive and minor destructive testing methods enable a classification of historic structures, building processes, applied building technologies and materials. Therefore, these methods should be part of the global investigation of historic buildings which is usually required before the planning of any building intervention. The case study presented herein encompasses experimental work carried out at the St. Servatius Church in Quedlinburg, Germany. Within a comprehensive restoration campaign, non-destructive on-site investigations were carried out with radar and ultrasonics. The results were combined with plans, views and cores recorded in advance.
Optische dreidimsionale Erfassung und Datenverarbeitung von Bauwerksoberflächen in der Denkmalpflege
(2016)
Im Beitrag werden Verfahren und Strategien für die dreidimensionale und zeitaufgelöste Erfassung und Darstellung von Veränderungen an Bauwerken und Skulpturen vorgestellt. Ablösungen und Verformungen
können im Rahmen eines Monitoring über größere Zeiträume verfolgt werden. Anhand systematischer Untersuchungen an einer Fallstudie im Magdeburger Dom werden in diesem Beitrag die Vorgehensweise und
Ergebnisse vorgestellt. Zudem kann mit diesen Verfahren auch der Zustand einer Skulptur nach einer Restaurierung dokumentiert werden. Eine dreidimensionale Erfassung kann weiterhin dazu verwendet werden, eine Kopie einer Skulptur mit einem 3D‐Druck‐Verfahren herzustellen. Dieses Verfahren wird in Bezug auf die Genauigkeit mit einem herkömmlich erstellten Gipsabdruck verglichen.
Strategies and methodologies for the assessment of historic masonry structures based on non-destructive and minor-destructive testing methods were developed in the European Research Project ONSITEFORMASONRY and were successfully applied to assess the structure and material properties of selected structural elements in the Altes Museum in Berlin-Mitte.
For the planning of a broad reconstruction within the framework of a master plan concerning the whole of Museum Island in Berlin, several questions arose which are also typical for other historic structures in general, thus the Altes Museum was chosen as a pilot site for the validation of non-destructive testing methods.
For the investigation of the complex inner structure of historic buildings, the application of radar has been increased during the last ten years. Although historic masonry in general is very inhomogeneous and although in some cases high absorption occurs due to enhanced moisture, radar has been successfully applied to get information on geometry, position of inclusions and about kind and size of existing damages. In this paper case studies will be presented concerning the localisation of metallic inclusions and the investigations of the structure of an exterior wall with a multiple leaf structure.
Monitoring of cracks in historic concrete structures using optical, thermal and acoustical methods
(2015)
Cracks are a major issue in the field of cultural heritage. In order to evaluate the significance of a crack, a long term monitoring of the damaged region is required. However, there is a lack of easy to operate tools for such monitoring measures. Therefore, new or existing methods for other applications have to be optimised for cultural heritage investigation. The paper describes the application of such crack observation methods on a historic concrete sculpture. Beside conventional methods, like mapping by hand and ultrasonic depth profiling, a novel tracking system is presented. Furthermore, the suitability of active thermography for the investigation of cracks was investigated. The results show promising prospects for these non-destructive techniques.
Methods for the combination (i. e. comparison and overlay) and data fusion (i. e. integration of all data in one data set, replacement of data) of active thermography and D laser scanner (light section method) have been developed. Systematic investigations for quantification of damage in historic structures are presented using both techniques. A case study shows that reproducible investigations at regular time intervals are very well suited for structural monitoring.