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1 2008

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Bending of fragmented architraves restored with bolted titanium bars: a numerical analysis

Kourkoulis S. K., Ganniari-Papageorgiou E.

Engineering Transactions

2008

Vol. 56, iss. 2

159-180

The mechanical behaviour of restored structural members of ancient monuments is studied in the present paper with the aid of the Finite Element Method. The study is motivated by the needs of the conservation project in progress on the Parthenon Tempie of the Acropolis of Athens; the results however could be valuable for various stone monuments under conserva-tion. Centrally fractured prismatic marble architraves (epistyles) of rectangular cross-section restored with either threaded or smooth titanium bars are modelled. The architraves are rest-ing on marble blocks simulating the capitals (abacuses) of the columns of the tempie. They are subjected to bending under uniformly distributed loading along their span, following the results of earlier studies, concerning the influence of the loading modę on the overall behav-iour of restored structural members. The method used for determination of the reinforcement reąuired is the one introduced recently by the scientists working for the restoration of the Acropolis monuments. All the loads that could be applied on the member after it is replaced in its initial positiori in the monument were taken into account, including the own weight of the member, the weights of the members that will rest on it after the restoration, as well as possible dynamie (earthąuake) loads. Emphasis is laid on the influence of the threads of the bolted bars in comparison to the results for the unbolted ones, in an effort to ąuantify the maximum anchoring length reąuired in order to minimize the intervention on the authentic Stones. The distribution of the stress and strain fields all over the architrave-abacus-reinforcing bar system is investigated and conclusions are drawn concerning the extreme stresses and the points where they are developed.