This study presents a methodology to perform a cost-benefit (C/B) analysis to assess possible options such as retrofitting or reconstruction of structures focused on mitigation of direct physical losses due to seismic actions. The case of all public school buildings located in Mexico City is presented as an illustrative example having as measure parameters the expected loss, the expected annual loss (EAL) and the probable maximum loss (PML). For the proposed methodology the following steps are required: (1) To gather technical information of typical school buildings designed according to different past seismic codes of the region, (2) To propose seismic mitigation actions such as retrofitting or stiffening of the structural system in order to comply with the current Mexico City seismic design code (RCDF-2004), (3) To compute vulnerability functions by carrying out non-linear Incremental Dynamic Analyses (IDA) for the original designed structural systems and those modified according to the performed mitigation actions, (4) To carry out a probabilistic seismic risk analysis taking into account all locations of public school buildings in Mexico City, (5) To perform a C/B analysis assuming two different cases: (a) retrofitting and/or stiffening the structural system and (b) demolish and reconstruct a completely new school building. This analysis is carried out at two different levels: (1) vulnerability functions of structures considering the two mitigation actions are obtained and compared, and (b) a combination of the different mitigation alternatives is investigated in order to determine, by obtaining the EAL and PML, the number and location of schools that require mitigation actions assuming that economical resources are limited. The usefulness of carrying out a C/B analysis by computing the seismic risk is shown as an aid to formulate and define mitigation strategies that allow decision-makers to prioritize the use of the economic resources. The advantage of this approach is that the obtained results will be presented in such a way they will be easier to communicate to decision-makers even if they are not familiar with formal risk studies.
Bulletin of Earthquake Engineering – Springer Journals
Published: Mar 15, 2017
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