Can Simple Pulses Adequately Represent Near-Fault Ground Motions?

This article investigates the importance of higher modes in the elastic response of tall buildings subjected to near-fault ground motions. Building structures modeled as generic frames are analyzed using a large set of forward-directivity affected pulse-like ground-motion records. It is found that higher modes contribute significantly to peak interstory drifts at the upper portions of the buildings. The importance of higher modes increases as the height of the frame is increased. Equivalent pulses, often used to characterize structural response to near-fault ground motions, are found to underestimate peak interstory drifts at the roof level by a factor of 1.4.

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