3 research outputs found
Ground motion selection for simulation-based seismic hazard and structural reliability assessment
This paper examines four methods by which ground motions can be selected for
dynamic seismic response analyses of engineered systems when the underlying
seismic hazard is quantified via ground motion simulation rather than empirical
ground motion prediction equations. Even with simulation-based seismic hazard, a
ground motion selection process is still required in order to extract a small number of
time series from the much larger set developed as part of the hazard calculation. Four
specific methods are presented for ground motion selection from simulation-based
seismic hazard analyses, and pros and cons of each are discussed via a simple and
reproducible illustrative example. One of the four methods (method 1 âdirect
analysisâ) provides a âbenchmarkâ result (i.e. using all simulated ground motions),
enabling the consistency of the other three more efficient selection methods to be
addressed. Method 2 (âstratified samplingâ) is a relatively simple way to achieve a
significant reduction in the number of ground motions required through selecting
subsets of ground motions binned based on an intensity measure, IM. Method 3
(âsimple multiple stripesâ) has the benefit of being consistent with conventional
seismic assessment practice using as-recorded ground motions, but both methods 2
and 3 are strongly dependent on the efficiency of the conditioning IM to predict the
seismic responses of interest. Method 4 (âGCIM-based selectionâ) is consistent with
âadvancedâ selection methods used for as-recorded ground motions, and selects
subsets of ground motions based on multiple IMs, thus overcoming this limitation in
methods 2 and 3
Ground motion selection for simulation-based seismic hazard and structural reliability assessment
This paper examines four methods by which ground motions can be selected for
dynamic seismic response analyses of engineered systems when the underlying
seismic hazard is quantified via ground motion simulation rather than empirical
ground motion prediction equations. Even with simulation-based seismic hazard, a
ground motion selection process is still required in order to extract a small number of
time series from the much larger set developed as part of the hazard calculation. Four
specific methods are presented for ground motion selection from simulation-based
seismic hazard analyses, and pros and cons of each are discussed via a simple and
reproducible illustrative example. One of the four methods (method 1 âdirect
analysisâ) provides a âbenchmarkâ result (i.e. using all simulated ground motions),
enabling the consistency of the other three more efficient selection methods to be
addressed. Method 2 (âstratified samplingâ) is a relatively simple way to achieve a
significant reduction in the number of ground motions required through selecting
subsets of ground motions binned based on an intensity measure, IM. Method 3
(âsimple multiple stripesâ) has the benefit of being consistent with conventional
seismic assessment practice using as-recorded ground motions, but both methods 2
and 3 are strongly dependent on the efficiency of the conditioning IM to predict the
seismic responses of interest. Method 4 (âGCIM-based selectionâ) is consistent with
âadvancedâ selection methods used for as-recorded ground motions, and selects
subsets of ground motions based on multiple IMs, thus overcoming this limitation in
methods 2 and 3