Evaluation of drift demands in existing steel frames under as-recorded far-field and near-fault mainshock–aftershock seismic sequences
Evaluation of drift demands in existing steel frames under as-recorded far-field and near-fault mainshock–aftershock seismic sequences
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DOI：
10.1016/j.engstruct.2010.11.021
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发表时间：
2011-02
影响因子：
5.5
通讯作者：
J. Ruiz-García;Juan C. Negrete-Manriquez
中科院分区：
文献类型：
--
作者：
J. Ruiz-García;Juan C. Negrete-Manriquez
本文介绍了一项研究的结果，旨在评估钢框架建筑物的余震的影响。为此，代表现有钢抗弯框架的三个框架模型经受了一组记录的主震-余震地震序列。为此，64个记录的地震序列注册的结果，1994年北岭和1980年猛犸湖地震被认为是在这项研究中。特别是，这项调查采用了14个地震序列记录在7个加速度站在近断层区。对记录到的地震序列的检验表明，主震和主余震的频率成分是弱相关的。在地震激励结束时，根据峰值和剩余（永久）漂移要求测量框架模型的响应。从这次调查的结果，不同于以往的结果的基础上人工地震序列，它被发现，记录余震不显着增加峰值和残余漂移的需求，因为余震的主要周期（即频率内容）是非常不同的框架模型的振动周期。此外，它表明，人工地震序列可以显着高估中值峰值和剩余漂移的要求，以及记录到记录的变化。
This paper presents results of a study aimed at evaluating the effect of aftershocks in steel framed buildings. For that purpose, three frame models representing existing steel moment-resisting frames were subjected to a set of as-recorded mainshock–aftershock seismic sequences. For this purpose, 64 as-recorded seismic sequences registered as a consequence of the 1994 Northridge and 1980 Mammoth Lakes earthquakes were considered in this study. In particular, this investigation employed 14 seismic sequences recorded in 7 accelerographic stations in the near-fault region. An examination of the as-recorded seismic sequences shows that the frequency content of the mainshock and the main aftershock is weakly correlated. The response of the frame models was measured in terms of the peak and residual (permanent) drift demands at the end of the earthquake’s excitation. From the results of this investigation, unlike previous results based on artificial seismic sequences, it was found that as-recorded aftershocks do not significantly increase peak and residual drift demands since the predominant period of the aftershocks (i.e. frequency content) is very different from the period of vibration of the frame models. In addition, it was shown that artificial seismic sequences could significantly overestimate median peak and residual drift demands as well as the record-to-record variability.