Double Resonance of Structures in San Fernando Valley During the Northridge Earthquake of January 17, 1994

1994 年 1 月 17 日北岭地震期间圣费尔南多谷结构的双重共振

• 批准号: 9412759
• 负责人: Marijan Dravinski
• 金额: $ 3.58万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-06-01 至 1995-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9412759&HistoricalAwards=false
• 关键词: Double; Resonance; Structures; San; Fernando

9412759 Dravinski The objective of this project is to obtain the predominant frequencies of vibration of ground motion in the San Fernando Valley area, and to compare them with the resonant frequencies of several key structures which suffered significant damage during the Northridge earthquake of January 17, 1994. This comparison permits the identification of "double resonance". (Double resonance occurs when the fundamental period of the ground coincides with the resonant frequency of the structure.) The specific tasks include: (1) the measurement of long-period microtremor response at highway bridges and overpasses which suffered severe damage during the earthquake (microtremors are naturally-occurring ground vibrations), and (2) measurement of long period microtremor response at seventy sites within the San Fernando Valley with simultaneous recordings at a reference bedrock site. ***

9412759 Dravinski本项目的目的是获得圣费尔南多谷地区地面运动的振动的主要频率，并将其与1994年1月17日北岭地震期间遭受重大破坏的几个关键结构的共振频率进行比较。 这种比较允许识别“双重共振”。 （当地面的基本周期与结构的共振频率一致时，就会发生双共振。） 具体任务包括：（1）在地震中遭受严重破坏的公路桥梁和立交桥处测量长周期微动响应（微动是自然发生的地面振动），以及（2）在圣费尔南多山谷内的70个地点测量长周期微动响应，同时在参考基岩地点进行记录。 ***