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Journal of archaeology and ancient architecture

Tag Archives: Partenone

Calculating reinforcement for fragmented architectural members. A three dimensional approach

scarica l’articolo in formato pdf:  Calculating reinforcement for fragmented architectural members. A three dimensional approach

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C:UsersavrouvaDocumentsAVrouva - ΑντίγραφοkionokraIn the Acropolis of Athens restoration project it is very often to come across significant fractures on the architectural marble members. The common practice of the restoration work is to join the marble fragments together with threaded titanium bars, inserted into drilled holes inside the marble and fixed into place with cement mortar. The estimation of the design loads of structures such as the Acropolis monuments is a very difficult task especially when the seismic response is concerned. For this reason elaborate and accurate methods and analytical tools have been used with very good results. At the recent times discrete elements analysis seems to predict accurately enough the response of these structures and provides a time effective method as opposed to the use of finite element analysis. But the use of such methods for calculating the required reinforcement in each fracture is not yet feasible in a large scale, thus simplified methods are still used to facilitate the work on the site. The methodology of calculating the required reinforcement so far consisted of simplified two dimensional analogies of the fractures and the reinforcement as well as the loading conditions. This article presents a concise and simplified methodology for the calculation of the required reinforcement for fragmented architectural members taking into account the effects of the three spatial dimensions (geometry of the fracture, geometry of the reinforcement and geometry of the loading). In this approach the problem of calculating the expected tension of the reinforcement in complicated spatial forms of fracture is dealt with. The important features and requirements meant to be kept by this project was that the final product should maintain the character of an easy to use and accessible tool that would respond in real time to facilitate the work of the civil engineers on the site.

The recent intervention programs on the monuments of the Athenian Acropolis

scarica l’articolo in formato pdfThe recent intervention programs on the monuments of the Athenian Acropolis

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An extended restoration program of the Athenian Acropolis monuments has been in progress since 1975. The project is carried out by the Hellenic Ministry of Education and Religious Affairs, Culture and Sports in order to alleviate the effects of serious problems due to natural causes (i.e. earthquakes) or human activities (i.e. fires, bombardments or earlier restorations). The interventions are complied with the spirit of the “Charter of Venice” and follow the principle of reversibility. Effort focuses on keeping the original construction form of the monuments. New marble is used for supplements only to ensure the structural stability of the buildings, while iron clamps and dowels are being replaced by reinforcements made of titanium. The authentic reliefs and sculptures are removed and transferred to the Acropolis Museum and replaced by casts in artificial stone. Scattered architectural fragments recognized as belonging to the monuments are reset in their original or a corresponding position. The paper focuses on the recent intervention programs on the projects underway at the Propylaia and the Parthenon.