Response of Earth Dams to Spatially-Varying Earthquake- Induced Ground Motion

土坝对空间变化地震引起的地面运动的响应

• 批准号: 9121292
• 负责人: Ronald Harichandran
• 金额: $ 10.69万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-06-01 至 1995-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9121292&HistoricalAwards=false
• 关键词: Response; Earth; Dams; Spatially; Varying

The objective of this research project is to study the effects of differential excitations along the base of a dam, caused by spatially varying earthquake ground motion. The standard procedure is to assume that all points at the base of the dam simultaneously experience the same earthquake-induced ground motion - that is, that the dam is shaken by the motion of a rigid plate on which it rests. In contrast, this study accounts for phase delay and incoherence effects of the base excitations arising from the propagation and scattering of seismic waves. Appropriate ground motion data are now available from the analysis and stochastic modeling of recent accelerograph recordings on and near earth dams. The research program involves: 1) The selection of a suitable ground motion model from these data; 2) A linear random vibration analysis of a three-dimensional earth dam model to study the effects of spatially varying ground motions; 3) The development of approximate excitation specifications that yield reasonable responses when the dam is analyzed using a two- dimensional model; 4) A preliminary assessment of topographical effects; 5) Investigation of the non-linear response using the method of equivalent linearization, with verification by Monte Carlo simulation. The results from this research are relevant to safety evaluations of existing earth dams, as well as to the design of new earth dams.

本研究项目的目标是 研究微分激励的影响 沿着大坝的底部，由空间上的 地震动变化 的 标准程序是假设所有点 在大坝的底部同时 经历同样的地震引发的 地面运动-也就是说，大坝被震动 由其所处的刚性板块的运动所决定。 相反，本研究考虑了相位延迟 基激发的非相干效应 由于传播和散射， 地震波 现在，适当的地面运动数据 可从分析和随机 最近的加速器记录的建模 和土坝附近。 研究计划 涉及： 1)选择合适的地震动 根据这些数据建模; 2)一种线性随机振动分析方法 三维土坝模型研究 空间变化的地面运动的影响; 3)近似激励的发展 产生合理响应的规范 当大坝被分析时， 三维模型; 4)地形的初步评估 影响; 5)非线性响应的研究 利用等效线性化方法， 并通过蒙特卡罗模拟进行验证。 这项研究的结果与 现有土坝的安全评价， 以及新土坝的设计。