3 research outputs found
Influence of Vertical Ground Motions on the Seismic Fragility Modeling of a Bridge-Soil-Foundation System
This paper explores the effects of vertical ground motions (VGMs) on the
component fragility of a coupled bridged-soil-foundation (CBSF) system with
liquefaction potential, and highlights the unique considerations on the demand
and capacity model required for fragility analysis under VGMs. Optimal intensity
measures (IMs) that account for VGMs are identified. Moreover, fragility curves
that consider capacity change with fluctuating axial force are derived. Results
show that the presence of VGMs has a minor effect on the failure probabilities
of piles and expansion bearings, while it has a great influence on fixed bearings.
Whether VGMs have an impact on column fragilities depends on the design axial
load ratio. Finally, more accurate fragility surfaces are derived, which are compared
with results of conventional fragility curves. This study highlights the
important role that VGMs play in the selection of optimal IMs, and the capacity
and fragility representation of certain components of CBSF systems