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首页> 外文会议>Increasing Seismic Safety by Combining Engineering Technologies and Seismological Data >Chapter 1.7 Comparison of Recorded Dynamic Characteristics of Structures and Ground During Strong and Weak Shaking
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Chapter 1.7 Comparison of Recorded Dynamic Characteristics of Structures and Ground During Strong and Weak Shaking

机译：第1.7章强弱振动过程中记录的结构和地面动力特性比较

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Variation of dynamic characteristics of undamaged structures, and free-field sites identified from strong motions as compared to those identified from weak motions has been the subject matter of numerous studies. Recently, this topic is rekindled with the premise but repeat of the well known conclusion that fundamental period (frequency) varies with amplitude of strong and weak shaking. Some researchers appropriately called this variation of dynamic characteristics as "wandering" of the natural frequencies of a structure. Although due to various sources of excitation and time-varying environmental conditions, variation of the fundamental period (frequency) of even an undamaged structure should not be a surprise to many, it is important to understand why such variation is important for practical purposes. It is important that, if such variation is significant, then, in practice, the dynamic characteristics identified from weak motions should be carefully considered before generalizing these characteristics as representative of strong shaking as well.rnIn this paper, we investigate the fundamental frequencies of an undamaged case study building for which there are numerous studies of several sets of vibration data, including forced vibration testing, strong shaking due to a distant large earthquake, and low-amplitude shaking due to ambient excitations as well as several small nearby earthquakes. It is shown that the fundamental frequency "wanders" in a consistent way with the level of shaking, and that the significant difference between low-amplitude and strong shaking is attributed to soil-structure interaction during stronger shaking. Furthermore, variation of dynamic characteristics for strong and weak motions are summarized for four additional buildings. The variations are too significant to ignore; thus leading to the conclusion that dynamic characteristics of buildings identified from weak motions cannot be generally used in lieu of those identified from strong shaking.rnIn addition, also for the free-field site associated with this building, using several approaches including strong and weak motions, site frequency is clearly identified for strong and weak motions. However the variation of site frequency is insignificant.
机译：无损结构的动态特性的变化以及从强运动中识别出的自由场位置与从弱运动中识别出的自由场位置的变化已成为众多研究的主题。近来，这个主题以前提为前提，但重复了众所周知的结论，即基本周期（频率）随强震动和弱震动的幅度而变化。一些研究人员将这种动态特性的变化恰当地称为结构自然频率的“游荡”。尽管由于各种原因的激励和随时间变化的环境条件，即使是未损坏的结构，基本周期（频率）的变化也不应令许多人感到意外，但重要的是要理解为什么这种变化对于实际目的很重要。重要的是，如果这种变化很大，那么在实践中，在将这些特性概括为代表强烈震动之前，还应仔细考虑从弱运动中识别出的动态特性。在本文中，我们研究了振动的基本频率。在未损坏的案例研究大楼中，对多组振动数据进行了大量研究，包括强制振动测试，由于大地震导致的强烈震动，由于环境激发以及附近的几次小地震引起的低振幅震动。结果表明，基频与振动水平一致地“波动”，并且低振幅和强振动之间的显着差异归因于强振动过程中的土壤-结构相互作用。此外，针对另外四座建筑物总结了强和弱运动的动态特性变化。差异太大而不能忽略；因此得出的结论是，通常不能使用通过弱运动识别的建筑物的动态特性来代替通过强震动识别的建筑物的动态特性。rn此外，对于与该建筑物相关的自由场站点，还可以使用包括强运动和弱运动在内的几种方法，可以清楚地识别出强弱运动的部位频率。但是，站点频率的变化微不足道。

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