The Ground Deformations and Failures in the Van Norman Complex After the 1994 Northridge Earthquake

9416151菲格罗亚1971年圣费尔南多地震发生23年后，1994年加利福尼亚州北岭地震对洛杉矶水电部范诺曼建筑群的土结构、输水管道系统和电力设备造成了重大破坏；特别是下圣费尔南多大坝和上圣费尔南多大坝、尾矿坝和洛杉矶水库。在4个LADWP地球结构上测量了地面变形，并在LADWP复合体内部和周围记录了17个强震记录。这个仪器齐全的场地提供了一个特殊的机会来研究遭受强烈(0.98g)地面震动的可液化土壤和土结构的永久变形和破坏以及地震后的稳定性。该项目涉及三个机构：南加州大学(第一部分)、达姆斯和摩尔大学(第二部分)和凯斯西储大学(第三部分)。其目的是分析1994年北岭地震后范诺曼综合体的地面变形和破坏；从研究和工程实践的角度，基于最先进的现场和实验室测量。三个研究小组的协调由南加州大学提供。第一部分(南加州大学)和第二部分(Dmes&Amp；Moore)的目的是将1971年的地面运动观测与1994年的地面运动观测进行比较，并研究非线性动力有限元分析在有充分记录的现场研究中的有效性。第三部分(凯斯西储大学)的目标是在范诺曼建筑群中一些有现场观测和测量的地点，利用单位能量法确定土壤的特性和液化势。除了用于本项目的第一部分和第二部分之外，还将把结果汇编到数据库中，供工程界使用。预计该项目将帮助执业工程师和监管机构评估现有的土和土结构地震反应模型的能力和局限性。这一行动是为了支持这一合作研究项目的第三部分(凯斯西储大学)。***

9416151 Figueroa Twenty-three years after the 1971 San Fernando Earthquake, the 1994 Northridge, CA, Earthquake caused substantial damage to earth structures, water conduit systems, and electrical equipment of the Van Norman complex of the Los Angeles Department of Water and Power (LADWP); specifically the Lower and Upper San Fernando Dams, the Tailrace, and the Los Angeles Reservoir. Ground deformations were measured on four LADWP earth structures, and there were seventeen strong-motion recordings inside and around the LADWP complex. This well-instrumented site provides a special opportunity to study the permanent deformations and failure and the post-earthquake stability of liquefiable soils and earth structures subjected to severe (0.98 g) ground shaking. This project involves three institutions: the University of Southern California (Part I), Dames & Moore (Part II), and Case Western Reserve University (Part III). The objective is to analyze the ground deformations and failures in the Van Norman complex following the 1994 Northridge Earthquake; from both research and engineering-practice points of view, based on state- of-the-art field and laboratory measurements. Coordination of the three research teams is provided by the University of Southern California. The objective of Part I (University of Southern California) and Part II (Dames & Moore) is to compare the 1971 with the 1994 observations of ground motions, and to investigate the validity of nonlinear dynamic finite element analyses in well-documented field studies. The objective of Part III (Case Western Reserve University ) is to characterize the soil and to establish its liquefaction potential, using the unit energy method, at a number of sites in the Van Norman complex where field observations and measurements are available. The results will be assembled in a data base and made available to the engineering community, in addition to being used in Parts I & II of this project. It is expecte d that this project will assist practicing engineers and regulatory agencies to evaluate the capabilities and limitations of available models for the seismic response of soils and earth structures. This action is to support Part III (Case Western Reserve University) of this collaborative research project. ***