A procedure for the evaluation of the seismic risk of damaged structures due aftershocks is here proposed with the aim to provide a tool for deciding whether, after a damaging mainshock, a structure can still be open for either emergency or ordinary traffic. In particular the mean annual rate of collapse of a mainshock-damaged structure due to aftershocks is calculated using the probabilistic aftershock hazard theory and calculating the fragility curves with IDA technique. The novelty of the procedure consists in using the in-situ inspection results in order to updated the fragility curves by Bayes theorem. For this purpose the correlation values between the observed damage and the drift available in literature has been used. An application to a highway r.c. bridge has shown the effectiveness of the procedure.
Paolacci, F., Giannini, R., Alessandri, S. (2010). Post-earthquake availability of damaged structures. Application to Highway Bridges. In 14th European Conference On Earthquake Engineering. Skopje : Macedonian Association for Earthquake Engineering (MAEE).