SEISMIC ASSESSMENT OF COMPLEX ASSETS THROUGH NONLINEAR STATIC ANALYSES: THE FORTRESS IN SAN FELICE SUL PANARO HIT BY THE 2012 EARTHQUAKE IN ITALY

Abstract eng:
This paper proposes a procedure for the seismic assessment of unreinforced masonry complex structures together with a first application to the case of fortresses. The proposal  of  such  procedure  arises  from  different  reasons:  firstly,  Standards  suggest  procedures  mainly  addressed  to  ordinary  structures;  furthermore,  even  those  Recommendations, which are more specifically addressed to monumental assets, state only general principles, without  specifying  operational  targeted‐procedure  for  their  seismic  assessment.  The  dam-­age  occurred  after  past  earthquakes,  and  in  particular  the  one  hit  the  Emilia  region  in  Italy, highlighted that fortresses are characterized by an aggregation of bodies with an own seismic  behavior  which,  however,  is  strongly  affected  by  their  dynamic  interaction  due  to the mutual boundary conditions. Hence, the adoption of a numerical three-dimensional model  of  the  whole  structure  is  necessary  to  take  into  account  explicitly  the  effect  of  such interactions. The proposed procedure requires the execution of a modal analysis of the whole  structure  in  order  to  define  the  modes  involving  the  dynamic  response  of  each  units and  their  modal  shapes.  Then,  fitting  the  modal  shapes,  proper  load  patterns  are  defined  to pass to the execution of pushover analyses. In particular, one load pattern is applied for each  unit  but  considering  the  whole  numerical  model.  The  pushover  curve  of  each  unit  is then converted in the capacity curve to finalize the seismic assessment and verification. The  proposed  procedure  is  applied  in  the  paper  to  the  case‐study  of  San  Felice  sul  Panaro fortress,  significantly  hit  by  the  Emilia  earthquake,  2012  allowing  the  comparison  between the  occurred  damage  and  the  one  simulated  by  the  nonlinear  static  analyses  and  to  validate the procedure. The potentialities of the proposed procedure seem relevant in order to provide  a  reliable  seismic  assessment  also  of  other  typology  of  complex  structures.

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