Engineering Transactions, 56, 2, pp. 159–180, 2008
10.24423/engtrans.205.2008

Bending of Fragmented Architraves Restored With Bolted Titanium Bars: a Numerical Analysis

S. K. KOURKOULIS
National Technical University of Athens, School of Applied Sciences, Department of Mechanics, Laboratory of Testing and Materials, Athens
Greece

E. GANNIARI-PAPAGEORGIOU
National Technical University of Athens, School of Applied Sciences, Department of Mechanics, Laboratory of Testing and Materials, Athens
Greece

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 Temple of the Acropolis of Athens; the results however could be valuable for various stone monuments under conservation. Centrally fractured prismatic marble architraves (epistyles) of rectangular cross-section restored with either threaded or smooth titanium bars are modelled. The architraves are resting on marble blocks simulating the capitals (abacuses) of the columns of the temple. They are subjected to bending under uniformly distributed loading along their span, following the results of earlier studies, concerning the influence of the loading mode on the overall behaviour of restored structural members. The method used for determination of the reinforcement required 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 position 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 dynamic (earthquake) 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 quantify the maximum anchoring length required 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.
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References

C. Zambas, M. Ioannidou and A. Papanikolaou, The use of titanium reinforcements for the restoration of marble architectural members of Acropolis Monuments, Proc. IIC Congress on Case Studies in the Conservation of Stone and Wall Paintings, The International Institute for Conservation of Historic and Artistic Works, 138–143, Bologna 1986.

M. Ioannidou, and V. Paschalides, Joining together beams of the Propyleae of Acropolis using titanium, Proc. of the 5th Int. Symp. for the Restoration of the Acropolis Monuments, F. Mallouchou-Tufano [Ed.], Committee for the Preservation of the Acropolis Monuments, Athens, pp. 291–300, 2002.

M. Mentzini, Joining together architraves and drums of the Parthenon: A new approach, Proc. of the 5th Int. Symp. for the Restoration of the Acropolis Monuments, F. Mallouchou-Tufano [Ed.], Committee for the Preservation of the Acropolis Monuments, Athens, 233–242, 2002.

S. K. Kourkoulis, E. Ganniari-Papageorgiou and M. Mentzini, Experimental and numerical evaluation of a new method for joining together fragmented structural members, Heritage, Weathering and Conservation (HWC-2006) Conference, Madrid, Spain, June 2006, [in:] Heritage, Weathering and Conservation, R. Fort et al. [Eds.], Balkema, The Netherlands, 657–665, 2006.

S. K. Kourkoulis, E. Ganniari-Papageorgiou and M. Mentzini, Joining Fragmented Marble Architraves Using Titanium Bars: A Numerical Analysis, Special Symposium on Fracture and Failure of Natural Building Stones, 16th European Conference on Fracture (ECF 16), Alexandroupoli, Hellas, July 2006, [in:] Fracture and Failure of Natural Building Stones – Applications in the Restoration of Ancient Monuments, S. K. Kourkoulis [Ed.], Springer, Berlin, 269–287, 2006.

C. Zambas, Mechanical Properties of Pentelik Marbles, Committee for the Restoration of Parthenon Publications, Athens, Greece 2004.

I. Vardoulakis, G. E. Exadaktylos, S. K. Kourkoulis and C. Papadopoulos, Characterization of Mechanical Properties and Damage of Natural Building Stones in Historical Monuments’, C., Proc. 4th International Symposium on the Conservation of Monuments in the Mediterranean, Rhodes, Greece, 6–11 May, 1997, A. Moropoulou, et al. [Eds.], Technical Chamber of Greece, 2, 193–206, 1997.

V. Perdikatsis, K. Kritsotakis, Th. Markopoulos and K. Laskaridis, Discrimitation of Greek marbles by trace-, isotope-, and mineralogical analysis, Special Symposium on Fracture and Failure of Natural Building Stones, 16th European Conference on Fracture (ECF 16), Alexandroupoli, Hellas, July 2006, [in:] Fracture and Failure of Natural Building Stones – Applications in the Restoration of Ancient Monuments, S. K. Kourkoulis [Ed.], Springer, Berlin, 497–515, 2006.

A. G. Tassogiannopoulos, A contribution to the study of the properties of structural natural stones of Greece, Ph.D. Dissertation, National Technical University of Athens, Greece 1986.

P. S. Theocaris and E. Coroneos, Experimental study of the stability of Parthenon, Publications of the Academy of Athens 44, 1–80, 1979.

I. Vardoulakis and S. K. Kourkoulis, Mechanical properties of Dionysos marble, Final report of the Environment Project EV5V-CT93-0300: Monuments under seismic action, National Technical University of Athens, Greece 1997.

G.E. Exadaktylos, I. Vardoulakis and S. K. Kourkoulis, Influence of nonlinearity and double elasticity on flexure of rock beams – I. Technical theory, International Journal of Solids and Structures, 38, 4091–4117, 2001.

K. N. Kaklis, and I. Vardoulakis, An experimental investigation of the size effect in indirect tensile test on Dionysos marble, [in:] Proc. 7th Nat. Congress on Mechanics, A. Kounadis, C. Providakis and G. Exadaktylos [Eds.], Technical University of Crete, II, 151–157, 2004.

S. K. Kourkoulis, E. Ganniari-Papageorgiou and M. Mentzini, Dionysos marble beams under bending: A contribution towards understanding the fracture of the Parthenon architraves, Engineering Geology, to appear, 2007.

M. Mentzini, Methodology of structural interventions on the Acropolis Monuments, The Acropolis restoration news – Journal of the Committee for the Preservation of the Acropolis Monuments, 6, 15–18, 2006.

G. E. Exadaktylos, I. Vardoulakis and S. K. Kourkoulis, Influence of nonlinearity and double elasticity on flexure of rock beams – II. Characterization of Dionysos marble, International Journal of Solids and Structures, 38, 4119–4145, 2001.

L. Dufort, S. Drapier, M. Grediac, Closed-Form Solution for the Cross-Section Warping in Short Beams Under Three-Point Bending, Composite Structures, 52, 233–246, 2001.

S. K. Kourkoulis, S.-A. Papanicolpulos, A. Marinelli, I. Vayas, Restaurierung antiker Tempel: Experimentelle Untersuchungen zum Ausziehverhalten von Verankerungen im Marmor, Bautechnik, 85, 2, 2008.

S. K. Kourkoulis, G. E. Exadaktylos and I. Vardoulakis, U-notched Dionysos Pentelicon marble in three-point bending: The effect of nonlinearity, anisotropy and microstructure, International Journal of Fracture, 98, 369–392, 1999.




DOI: 10.24423/engtrans.205.2008