Response of multi-story structures to near-fault ground motions and equivalent pulses
Date
2010
Authors
Sehhati, R.
Rodriguez Marek, A.
Cofer, W.F.
ElGawady, M.
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Conference paper
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9th US National and 10th Canadian Conference on Earthquake Engineering 2010, Including Papers from the 4th International Tsunami Symposium, 2010, pp.6997-7006
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9th US National and 10th Canadian Conference on Earthquake Engineering 2010, Including Papers from the 4th International Tsunami Symposium (25 Jul 2010 - 29 Jul 2010 : Canada)
Abstract
The response of multi-story structures to near-fault ground motions were investigated to find the most predictive Intensity Measure for these kinds of motions utilizing Incremental Dynamic Analysis. Three different generic multistory shear buildings were subjected to fifty four near-fault ground motions including ordinary and forward-directivity records. The Maximum Story Displacement Ductility Demand was selected as the Engineering Demand Parameter. Results showed that the only intensity measure that appears to be valid for both ordinary and forward-directivity ground motions is the peak ground velocity. The structural response to the forward directivity ground motions was reproduced using an equivalent pulse model based on the modified Gabor Wavelet pulse. It is shown that when the ratio of pulse period to the fundamental structural period falls in a range of 0.5 to 2.5, the equivalent pulse model appropriately represents structural response to forward-directivity ground motions. The simplified pulse parameters can be predicted using existing relationships and can be incorporated into probabilistic seismic hazard analysis to develop a seismic reliability analysis. Finally, P-Δ was investigated for forwarddirectivity ground motions. Results showed that P-Δ effects on the ductility demand are significant.
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Copyright 2010 Earthquake Engineering Research Institute