Jaimes, Miguel A.

Cost-Benefit Analysis To Assess Seismic Mitigation Options, Case Study: Public Mexican Schools Buildings

Abstract eng:
This paper presents a methodology to perform a cost-benefit 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, using as decision variable the expected annual loss (EAL) and probable maximum loss (PML). The proposed methodology is comprised of the following steps: 1) Gathering of design information of typical school buildings designed according to different past seismic codes of the region. 2) Proposal of 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) Calculation of vulnerability functions by carrying out nonlinear Incremental Dynamic Analyses (IDA) for the original designed structural systems and those modified according to the performed mitigation actions. 4) Probabilistic seismic risk analysis taking into account all locations of public school buildings in Mexico City. 5) Cost-benefit 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) definition of vulnerability functions of structures considering the two mitigation actions and comparison between them, and b) combination of the different mitigation alternatives in order to determine, the number and location of schools that required mitigation actions assuming that economical resources is limited, by means of the estimated EAL and PML. It is shown the utility of carrying out a cost-benefit analysis by computing in a formal way the seismic risk to formulate and define mitigation strategies that allow decision-maker prioritize the use of the economic resources. The benefit of this approach is that the obtained results will be presented in a way that may be easier to communicate to decision-makers even if they are not familiar with formal risk studies.

Contributors:

Niño, Mauro

Conference Title:

Proceedings of the 16th World Conference on Earthquake Engineering

Conference Title:

16th World Conference on Earthquake Engineering

Conference Venue:

Santiago (CL)

Conference Dates:

2017-01-09 / 2017-01-13

Rights:

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