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Effect of Damping Mechanisms on the Response of Seismically Isolated Structures

机译：阻尼机制对地震隔震结构响应的影响

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In this report the efficiency of various dissipative mechanisms to protect211u001estructures from pulse-type and near-source ground motions is examined. It is 211u001efirst shown that under such motions the concept of equivalent linear damping has 211u001elimited meaning since the transient response of a structure is more sensitive to 211u001ethe nature of the dissipation mechanism, rather than to the amount of energy 211u001edissipated per cycle. Subsequently, physically realizable cycloidal pulses are 211u001eintroduced, and their resemblance to recorded near-source ground motions is 211u001eillustrated. The study uncovers the coherent component of some hear-source 211u001eacceleration records, and the shaking potential of these records is examined. It 211u001eis found that the response of structures with relatively low isolation periods is 211u001esubstantially affected by the high frequency fluctuations that override the long 211u001eduration pulse. Therefore, the concept of seismic isolation is beneficial even 211u001efor motions that contain a long duration pulse which generates most of the 211u001eunusually large displacements and velocities of near-source events.

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