Performance of Earth Dams During the Whittier Narrows Earthquake of October 1, 1987

1987 年 10 月 1 日惠蒂尔海峡地震期间土坝的性能

基本信息

批准号：
8803946
负责人：
Ronald Scott
金额：
$ 10.62万
依托单位：
California Institute of Technology
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1988
资助国家：
美国
起止时间：
1988-04-15 至 1991-03-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8803946&HistoricalAwards=false
关键词：
Performance Earth Dams During Whittier

项目摘要

A number of earth and rockfill dams, instrumented with strong ground motion recorders, experienced the Whittier Narrows earthquake of October 1, 1987. The closest was the Whittier Narrows Dam, at 4 kilometers distance from the earthquake's epicenter. The maximum horizontal acceleration was 0.32g recorded at the crest of the dam, while the upstream recorder indicated a peak vertical acceleration of 0.46g. The response of other dams at greater distances was also obtained. Few strong motion records are available for such structures. This project addresses the analysis of these records from nine earth dams in order to understand the behavior of earth dams, and the utility of different analytical models for the analysis of dam response. The shaking during the main shock, as well as the after shocks, triggered all accelerographs on the nine dams, providing the most extensive array of earthquake response measurements of earth dams yet obtained in the U.S. and abroad. It is a cooperative project between the California Institute of Technology and the University of Southern California. Three major tasks are being addressed: (1) data processing, analysis, and comparison of accelerograms; (2) evaluation of internal permanent deformation and cracking in the dams; and (3) summarizing the observations, results, and conclusions in a general recommendation for the strengthening of earth dams for earthquake resistance. The California Institute of Technology is concentrating on performing centrifuge tests on physical models of one or two of these dams, while the University of Southern California is concentrating on both simplified and complex numerical models of nine dams. A comparison is being made of the results of the centrifuge tests, the observed response of the dams during the Whittier Narrows earthquakes, and the results of the computer analysis using the numerical models.

许多地球和岩石大坝装有强大的地面运动录音机，经历了1987年10月1日的狭窄地震。最接近的是距离地震震中4公里处的Whittier Narrows大坝。最大水平加速度为0.32克，在大坝的波峰处记录，而上游录音机表示峰值垂直加速度为0.46g。还获得了其他大坝在更远处的响应。很少有强大的运动记录可用于此类结构。该项目介绍了从九个地球大坝中的这些记录的分析，以了解地球大坝的行为，以及不同分析模型对大坝反应分析的效用。主要冲击期间的摇动以及后的冲击触发了九个水坝上的所有加速仪，提供了在美国和国外获得的地震响应测量最广泛的地震反应测量值。这是加利福尼亚理工学院和南加州大学之间的合作项目。正在解决三个主要任务：（1）加速图的数据处理，分析和比较；（2）评估大坝内部永久变形和破裂；（3）总结一般建议的观察结果，结果和结论，以增强地震抵抗的地球大坝。加利福尼亚理工学院正在集中精力对其中一两个大坝的物理模型进行离心测试，而南加州大学则集中于九个水坝的简化和复杂的数值模型。正在比较离心测试的结果，在Whittier狭窄地震期间观察到的大坝的响应以及使用数值模型的计算机分析结果。