Evaluation of the damping modification factor for structures subjected to near-fault ground motions
Evaluation of the damping modification factor for structures subjected to near-fault ground motions
复制标题
近断层地震动结构阻尼修正系数的评估
DOI：
10.1007/s10518-016-9885-8
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发表时间：
2016-02
影响因子：
4.6
通讯作者：
Huang Bin
中科院分区：
文献类型：
--
作者：
Pu Wuchuan;Kasai Kazuhiko;Kab;o EK;Huang Bin
阻尼修正因子（DMF）已广泛用于地震工程中，以描述由于不同阻尼比而导致的结构响应的变化。众所周知，DMF 不仅取决于结构动力特性，还取决于地面运动的特征。现行地震规范中规定的DMF通常是基于远断层地震动而制定的，不适用于涉及脉冲状近断层地震动的结构设计。在本文中，DMF 的统计研究是基于 50 个精心挑选的脉冲状近断层地震动进行的。据观察，脉冲状地面运动的 DMF 表现出对特定周期范围内的脉冲周期的显着依赖性。如果结构响应的周期接近脉冲周期，则 DMF 达到与远断层地面运动产生的水平相同的水平；由于结构的周期远大于或小于脉冲周期Tp，因此增加阻尼比对响应的降低效果一般较小，但长脉冲周期的大地震除外，对于周期小于Tp的结构，其响应显着降低。基于DMF的统计结果，提出了估算位移、速度和加速度谱的DMF的经验公式，公式中考虑了结构周期、脉冲周期和阻尼比的影响，并设计了满足0.1<T/Tp<1周期范围内特定可靠性要求的公式，具有工程意义。
The damping modification factor (DMF) has been extensively used in earthquake engineering to describe the variation of structural responses due to varied damping ratios. It is known that DMFs are dependent not only on structural dynamic properties but also on characteristics of ground motions. DMFs regulated in current seismic codes are generally developed based on far-fault ground motions and are inappropriately used in structural design where pulse-like near-fault ground motions are involved. In this paper, statistical investigation of the DMF is performed based on 50 carefully selected pulse-like near-fault ground motions. It is observed that DMFs for pulse-like ground motions exhibit significant dependence on the pulse periodTpin a specific period range. If the period of the structure in response is close to the pulse period, the DMF attains the same level as that derived from far-fault ground motions; as the period of the structure is considerably larger or smaller than the pulse periodTp, the response reduction effect by the increased damping ratio is generally small, except for large earthquakes with long pulse periods, which exhibit significant reduction of response for structures with periods smaller thanTp. Based on the statistical results of DMFs, the empirical formulas for estimating DMFs for displacement, velocity and acceleration spectra are proposed, the effect of structural period, pulse period and damping ratio are considered in the formulas, and the formulas are designed to satisfy the specific reliability requirement in the period range of 0.1 <T/Tp< 1, which is of engineering interest.
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影响因子：
3
作者：
Baker, Jack W.
通讯作者：
Baker, Jack W.
DOI：
--
发表时间：
2000
期刊：
--
影响因子：
--
作者：
Babak Alavi-Shushtari
通讯作者：
Babak Alavi-Shushtari
影响因子：
3
作者：
G. Mavroeidis;A. Papageorgiou
通讯作者：
G. Mavroeidis;A. Papageorgiou
影响因子：
4
作者：
D. Hubbard;G. Mavroeidis
通讯作者：
D. Hubbard;G. Mavroeidis
DOI：
--
发表时间：
1956
期刊：
--
影响因子：
--
作者：
G. Housner
通讯作者：
G. Housner