Issue 40

M. Mentzini, Frattura ed Integrità Strutturale, 40 (2017) 95-107; DOI: 10.3221/IGF-ESIS.40.09 105 Figure 19 : Inserting titanium bars on the upper side’s area of the drum to join the supplement “D 1 F 1 ” to the ancient marble (on the left). After joining the supplement “D 1 F 1 ” to the main volume of the drum, the holes on its surface (in order to adjust the titanium plate anchor) sealed with the pieces of the extruded new marble (on the right). F RACTURE DETECTION uring the intervention of the Parthenon’s North Colonnade forty-seven (47) drums were structurally restored while the study and the structural intervention for additional fourteen (14) ones have been supervised (in total sixty-one (61) members). It is noteworthy that although most of the damages were caused from the members’ fall due to Morosini’s explosion, and many remains were worked out by N. Balanos, changing the shape of the fracture planes of the members as well as their original exact position on the monument, the detailed observation and the data processing succeeded to identify and verify the conclusions of previous research. For example an existing fracture and the consequent loss of mass at drums cause similar failures to the adjacent ones, a kind of imprints. During rocking a severe stress field is developed in the edge of the remaining part of the drum, leading to the creation of cracks at the adjacent members. As a result the bearing capacity and behaviour under seismic loading of the entire structure are drastically deteriorating. Therefore it is necessary to repair the damages and restore them even using new marble supplements [7]. In case of the drums of the Parthenon’s North Colonnade, fractures’ coincidence has been detected between the follow- ing members:  The upper side of 4.8 in correspondence to the lower side of 4.9  The upper side of 5.6 in correspondence to the lower side of 5.7  The upper side of 6.3 in correspondence to the lower side of 6.4  The upper side of 6.4 in correspondence to the lower side of 6.5  The upper side of 6.5 in correspondence to the lower side of 6.6  The upper side of 6.6 in correspondence to the lower side of 6.7  The upper side of 6.7 in correspondence to the lower side of 6.8  The upper side of 9.7 in correspondence to the lower side of 9.8  The upper side of 10.9 in correspondence to the lower side of 10.10 C ONCLUSIONS he structural interventions on ancient members during the extensive restoration program of the Parthenon Temple on the Acropolis of Athens, offers to the scientists working in this field an in depth knowledge of the stress and strain fields developed in the structural elements to be restored. In addition the scientist has to face the challenge of redesigning and adapting the results of the already described theo- retical process to achieve the structural integrity of ancient members in a way, which is flexible during its realization. The shape of the remaining ancient volumes determines the exact geometry of the supplements since their contact areas must be perfectly fitted. As a result the direction of the reinforcement needed is limited. D T