Measurement and Analysis of the Influence of Buildings on the Strong Motions Recorded at the Jensen Filtration Plant

摘要：1994年北岭地震序列（主震和余震）期间詹森过滤厂记录的强烈地面震动为研究土壤非线性提供了一个独特的机会。位于加利福尼亚詹森过滤厂的两个紧挨着的加速度计站记录下了地震的运动；一个站点位于中等坚硬的土壤上，另一个站点位于非常坚硬的土壤上。这两个记录的特征——它们是完全不同的——表明，在主震期间，在中等硬度的土壤部位，非线性土壤反应可能是显著的。然而，该站的两座建筑物也有不同的加速度计，这引起了人们的关注，即土壤-结构相互作用是否影响了一个或两个站点的运动。因此，本研究的目的是探讨土壤-结构相互作用对记录的影响。两个联邦机构正在合作支持这个项目：美国地质调查局和国家科学基金会。

ABSTRACT: CMS-9714858, C.B. Crouse, Dames & Moore The strong ground shaking recorded at the Jensen Filtration Plant during the 1994 Northridge earthquake sequence (mainshock and aftershocks) offers a unique opportunity to study soil nonlinearity. Two accelerographs stations close together at the Jensen Filtration Plant in California recorded the earthquake motions; one station was situated over moderately stiff soil, the other on very stiff soil. The character of the two recordings -- which were quite different -- suggests that nonlinear soil response could have been significant at the moderately stiff soil site during the mainshock. However the two buildings containing station accelerographs at this site were also different, which raises the concern whether soil- structure interaction affected the motions at one or both stations. Thus the objective of this study is to investigate the influence of soil-structure interaction on the recordings. Two Federal agencies are collaborating in the support of this project: the US Geological Survey and the National Science Foundation.