R drmar su r r s

In eq. (1) T is the natural period of the structure, and n = V(10/(5 + §) where § is the damping ratio.

In eq. (2) r is the so-called transformation factor, T* is the period of the idealized single degree of freedom (SODF) system and SDe is the elastic displacement response spectrum.

2.3 Mechanism analysis

The examination of the collapse and the damage consequent to past earthquakes enable to foresee the occurrence of recurrent modes and mechanism of collapse in masonry church buildings (D'Ayala et al. 1997, Lagomarsino 1999, Lagomarsino & Podesta 2004). It is possible then to connect previous results obtained by the finite element technique for a comparison with the results obtained by the analysis of

Figure 9. Cracking pattern (pushover,/-direction).

kN 20000 8000 6000 4000 2000 0000 8000 6000 4000 2000 0

Capadty Curve

1

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