Development of seismic fragility surfaces for reinforced concrete buildings by means

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Development of seismic fragility surfaces for reinforced concrete buildings by means of nonlinear time-history analysis

Author: D. M. Seyedi, P. Gehl, J. Douglas, L. Davenne, N. Mezher and S. Ghavamian | Size: 494 KB | Format: PDF | Publisher: EARTHQUAKE ENGINEERING AND STRUCTURAL DYNAMICS | Year: 2009 | pages: 18

EARTHQUAKE ENGINEERING AND STRUCTURAL DYNAMICS
Earthquake Engng Struct. Dyn. 2010; 39:91–108
Published online 3 August 2009 in Wiley InterScience. DOI: 10.1002/eqe.939

SUMMARY
Fragility curves are generally developed using a single parameter to relate the level of shaking to the
expected structural damage. The main goal of this work is to use several parameters to characterize the
earthquake ground motion. The fragility curves will, therefore, become surfaces when the ground motion
is represented by two parameters. To this end, the roles of various strong-motion parameters on the induced
damage in the structure are compared through nonlinear time-history numerical calculations. A robust
structural model that can be used to perform numerous nonlinear dynamic calculations, with an acceptable
cost, is adopted. The developed model is based on the use of structural elements with concentrated
nonlinear damage mechanics and plasticity-type behavior. The relations between numerous ground-motion
parameters, characterizing different aspects of the shaking, and the computed damage are analyzed and
discussed. Natural and synthetic accelerograms were chosen/computed based on a consideration of the
magnitude-distance ranges of design earthquakes. A complete methodology for building fragility surfaces
based on the damage calculation through nonlinear numerical analysis of multi-degree-of-freedom systems
is proposed. The fragility surfaces are built to represent the probability that a given damage level is reached
(or exceeded) for any given level of ground motion characterized by the two chosen parameters. The
results show that an increase from one to two ground-motion parameters leads to a significant reduction
in the scatter in the fragility analysis and allows the uncertainties related to the effect of the second
ground-motion parameter to be accounted for within risk assessments.

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