Abstract
Pseudo-resonance and transient effects of long-period structures were analyzed based on the analysis of seismic response of SDOF (single degree of freedom) system. Far-field harmonic-like ground motions and near-fault pulse-like ground motions are two types of long-period ground motions which can lead to pseudo-resonance of long-period structures, but contrast analysis of characteristics for long-period ground motions and seismic response is still rare. Firstly, based on the contrast analysis of predominant frequency and energy distribution coefficient, characteristics of energy time-frequency distribution were analyzed. The results show that: energy of two types of long-period ground motions are concentrated in lower frequency bands, especially far-field harmonic-like ground motions; in time domain, energy distribution of near-fault pulse-like ground motions and ordinary ground motions are more concentrated than far-field harmonic-like ground motions. Secondly, elastic response spectrum were analyzed and the results show that: in long-period bands, response spectrum values corresponding to far-field harmonic-like ground motions and near-fault pulse-like ground motions are greater than ordinary ground motions, especially velocity response spectrum, displacement response spectrum and input energy spectrum; all kinds of reaction for far-field harmonic-like ground motions are much greater than near-fault pulse-like ground motions and attenuation of the former is much more slowly. Finally, concept of the transient effect was put forward, and transient effects of actual ground motions were analyzed. The results show that: transient effects are natural attributes of high-frequency components of ground motions, which couldn’t cause transient displacement damage of long-period structures. In long-period structural seismic design, it is necessary to consider the pseudo-resonance caused by two types of long-period ground motions, while it is unnecessary to consider transient effects.
Key words
long-period ground motions /
energy time-frequency distribution /
response spectrum /
transient effects /
long-period SDOF system
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WANG Bo BAI Guo-liang DAI Hui-juan.
mailSeismic response analysis of long-period SDOF system under typical ground motions[J]. Journal of Vibration and Shock, 2013, 32(15): 190-196
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