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The step where the church is subdivided into macroelements is a crucial one. It consists in identifying the architectonic elements where the seismic behavior acts quite independent by the rest of the structure. Major macro-elements could be searched on the fa├žade, on the apse or on the bell tower. For each macroelement must be considered its typology and their

Figure 15. Mechanism 4: lateral wall overturning.

Figure 12. Mechanism 1: pronaos overturning (local).

Figure 15. Mechanism 4: lateral wall overturning.

Figure 16. Mechanism 5: lateral wall overturning.

Figure 13. Mechanism 2: pronaos overturning (local).

Figure 16. Mechanism 5: lateral wall overturning.

Figure 13. Mechanism 2: pronaos overturning (local).

Figure 14. Mechanism 3: pronaos overturning (global).

connection with the remaining parts of the building. All these informations must be collected during the in-situ survey of the church, and every structural detail need to be recorded (Brencich et al. 1998). This paper

Figure 17. Mechanism 6: lateral wall overturning.

reports results on the mechanisms that could be activated on the pronaos (Figs 12-14), in the lateral wall of the church (Figs 15-17), in the lateral wall of the nave (Fig. 18) and on the apse (Fig. 19).

Figure 18. Mechanism 7: nave wall overturning.
Figure 19. Mechanism 8: apse wall overturning.

Results from the macro-element approach, reported in Table 3, agree with the results obtained with the pushover analysis via the finite element technique. The critical behavior of the church is activated when the seismic load is acting on the transversal direction of the nave of the church. This is mainly due to the absence of a buttress able to counteract the seismic action. Despite the good quality of connection between walls and timber roof, this does not produce an effort in this direction. Other local collapses could arise in local areas of the church (the pronaos, lateral walls overturning) that do not however involve the entire structure.

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