Risk-targeted seismic design maps
Résumé
There is currently a move towards seismic design maps that are risk-targeted (e.g. Luco et al., SEAOC convention proceedings, 2007). In this framework, buildings conforming to the design rules have a known annual risk of attaining or exceeding a certain damage state (e.g. collapse) that is uniform over a territory. The development of such maps relies on three independent inputs: a) seismic hazard curves derived using probabilistic seismic hazard assessment for each grid point on the map; b) fragility curves expressing the probability that a structure, designed using the building code, attains or exceeds a certain damage state given a level of shaking; and c) knowledge of the risk level that is acceptable to the local population. This presentation will summarize recent sensitivity tests of this approach undertaken for mainland France by Douglas et al. (Natural Hazards, 2013) and a follow-up study by Ulrich et al. (Bulletin of Earthquake Engineering, 2014) made to better constrain the fragility curves for buildings designed using Eurocode 8.