Identification and modeling of earthquake ground response — I. Site amplification
Identification and modeling of earthquake ground response — I. Site amplification
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DOI：
10.1016/s0267-7261(96)00021-8
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发表时间：
1996-12
影响因子：
4
通讯作者：
A. Elgamal;M. Zeghal;E. Parra;R. Gunturi;H. Tang;J. Stepp
中科院分区：
文献类型：
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作者：
A. Elgamal;M. Zeghal;E. Parra;R. Gunturi;H. Tang;J. Stepp
地震井下阵列数据提供了一个独特的信息来源，在实际土壤（和整个网站）的行为在广泛的负载条件下，不容易涵盖的现场或实验室实验程序。在本文中，自由场井下阵列地震记录识别和模拟记录的响应在罗东（台湾）和金银岛（加州）网站。在罗东，一个五加速度计阵列记录了18次地震（1985-1986年）的现场反应。1992年，金银岛遗址安装了一组六个加速度计，记录了1993年的一次低振幅地震。利用该井下数据，进行相关和频谱分析，以评估剪切波传播特性，剪切波速度随深度和现场共振频率和模型配置的变化。此外，实际的地震剪切应力-应变历史直接从记录的井下加速度估计。这些历史提供了宝贵的洞察现场放大，阻尼和孔隙压力的建立机制。这些情况下的历史进行计算模拟的基础上确定的机制的网站响应。在配套文件中，另外两个案例的历史，现场液化进行了分析，使用记录的井下地震反应。
Seismic downhole-array data provide a unique source of information on actual soil (and overall site) behavior over a wide range of loading conditions that are not readily covered by in-situ or laboratory experimentation procedures. In this paper, free-field downhole-array seismic records are employed to identify and model the recorded response at the Lotung (Taiwan) and Treasure Island (California) sites. At Lotung, a five-accelerometer array recorded the site response during 18 earthquakes (1985–1986). The Treasure Island site was instrumented in 1992 with an array of six accelerometers that recorded a low amplitude earthquake in 1993. Using this downhole data, correlation and spectral analyses are performed to evaluate shear wave propagation characteristics, variation of shear wave velocity with depth and site resonant frequencies and model configurations. In addition, the actual seismic shear stress-strain histories are directly evaluated from the recorded downhole accelerations. These histories provide valuable insight into the mechanisms of site amplification, damping and pore-pressure build-up. Computational simulations of these case histories are performed based on the identified mechanisms of site response. In a companion paper, two additional case histories of site liquefaction are analyzed using records of downhole seismic response.