FRACAS: A capacity spectrum approach for seismic fragility assessment including record-to-record variability

Tiziana Rossetto (1) , Pierre Gehl (2) , Stylianos Minas (1) , Carmine Galasso (1) , Philippe Duffour (1) , John Douglas (3) , Oliver Cook (1)

1 UCL - University College of London [London]
2 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
3 University of Strathclyde [Glasgow]

This paper presents a new approach for the derivation of fragility curves, named FRAgility through Capacity spectrum ASsessment (FRACAS). FRACAS adapts the capacity spectrum assessment method and uses inelastic response spectra derived from earthquake ground motion accelerograms to construct fragility curves. Following a description of the FRACAS approach, the paper compares the predicted maximum interstory drift (MIDR) response obtained from FRACAS and nonlinear time history analyses (NLTHA) for two case-study buildings subjected to 150 natural accelerograms. FRACAS is seen to represent well the response of both case-study structures when compared to NLTHA. Observations are made as to the sensitivity of the derived fragility curves to assumptions in the capacity spectrum assessment and fragility curve statistical model fitting. The paper also demonstrates the ability of FRACAS to capture inelastic record-to-record variability and to properly translate this into the resulting fragility curves.

Keywords: Capacity spectrum method; Record-to-record variability; Fragility curve

Domains: Engineering Sciences [physics]

Tiziana Rossetto, Pierre Gehl, Stylianos Minas, Carmine Galasso, Philippe Duffour, et al.. FRACAS: A capacity spectrum approach for seismic fragility assessment including record-to-record variability. Engineering Structures, 2016, 125, pp.337 - 348. ⟨10.1016/j.engstruct.2016.06.043⟩. ⟨hal-01685882⟩