Determining the Damageability of the Loma Prieta Earthquake Motions: Predicted and Observed Damageability and Soil Effects

确定洛马普列塔地震的破坏性：预测和观测的破坏性以及土壤影响

• 批准号: 9003588
• 负责人: Robert Sewell
• 金额: $ 5.74万
• 依托单位: Risk Engineering, Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-05-15 至 1991-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9003588&HistoricalAwards=false
• 关键词: Determining; Damageability; Loma; Prieta; Earthquake

This project addresses the lessons learned from the 17 October 1989 Northern California (Loma Prieta) earthquake. The aim is to evaluate critical parameters of the Loma Prieta earthquake ground motions (including after shocks) that have engineering significance, and to demonstrate the use of these parameters in predicting the damageability of future Bay Area earthquakes. Information on the duration, time-variation and breadth of frequency content, cyclic history, etc. - motion properties known to have important effects on structural damage, but which are difficult to define and use explicitly - this information is incorporated implicitly in the characterization. A comparison is made between the predicted and observed damage-effective motion characteristics for the Loma Prieta earthquake. The observed analytical characterizations are used to explain specific cases of building damage and non- damage, while the influence of the soil on the motion characterizations is determined statistically. These data from the Loma Prieta earthquake are combined with data computed for earlier events. The project is expected to result in improved statistical formulas for the magnitude/distance/soil dependence of nonlinear damageability. These formulas, when combined with local soils data, are used to conduct probabilistic hazard analyses to derive maps of the damageability of future Bay Area earthquakes.

该项目旨在吸取 1989 年 10 月 17 日北加州（洛马普里塔）地震的教训。 目的是评估具有工程意义的洛马普列塔地震地面运动（包括后震）的关键参数，并展示这些参数在预测未来湾区地震破坏性中的用途。 关于频率内容的持续时间、时间变化和宽度、循环历史等的信息——已知对结构损伤有重要影响的运动特性，但很难明确定义和使用——这些信息隐式地纳入表征中。 对洛马普列塔地震的预测和观测的损伤有效运动特征进行了比较。 观察到的分析特征用于解释建筑物损坏和未损坏的具体情况，而土壤对运动特征的影响则通过统计确定。 这些来自洛马普列塔地震的数据与针对早期事件计算的数据相结合。 该项目预计将改进非线性损伤程度/距离/土壤依赖性的统计公式。 这些公式与当地土壤数据相结合，用于进行概率危险分析，以得出未来湾区地震的破坏性图。