Damage Analysis of Ground-Based and Elevated Tanks During the 1989 Loma Prieta Earthquake

1989 年洛马普列塔地震期间地面和高架储罐的损坏分析

• 批准号: 9011159
• 负责人: Medhat Haroun
• 金额: $ 7.01万
• 依托单位: University of California-Irvine
• 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 1991-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9011159&HistoricalAwards=false
• 关键词: Damage; Analysis; Ground; Based; Elevated

This is a post-event investigation project to learn engineering lessons from the Loma Prieta earthquake (October 1989). The Loma Prieta earthquake induced munerous incidents of damage to both ground-based and elevated tanks, and even to some of the retrofitted tanks. In particular, site amplification of long period ground motion components appears to be the cause of large amplitude sloshing and associated damage to tanks built on Bay Mud. In this project the data collected will be analyzed to evaluate the performance of tank structures. The tasks include: (1) collection of data and documentation of the damage sustained by ground-based water and petroleum storage tanks and by elevated water storage tanks, (2) calculation of the dynamic response of representative tanks and correlation of the computed response with observed damage or lack of damage, (3) study of the effects of site amplification of long period components on the sloshing phenomenon and on rocking motion of tanks founded on Bay Mud, (4) study of the damage to retrofitted tanks to deduce the reasons for the ineffectiveness of the implemented retrofit mechanisms, and (5) comparison of induced seismic forces with those specified by available codes and standards such as API 650, AWWA 100 and UBC. By comparison of the predicted response with actual behavior under earthquake loading, the analytical methods developed for response calculation of tanks will be refined and improved design procedures will be developed.

这是一个事后调查项目，旨在从洛马普列塔地震（1989 年 10 月）中汲取工程教训。 洛马普列塔地震对地面和高架储罐甚至一些改装储罐造成了严重损坏。 特别是，长周期地面运动分量的现场放大似乎是造成大振幅晃动以及对海湾泥浆上建造的储罐造成相关损坏的原因。 在该项目中，将对收集的数据进行分析，以评估储罐结构的性能。 任务包括：(1) 收集地面水和石油储罐以及高架储水罐所遭受损害的数据和记录，(2) 计算代表性储罐的动态响应以及计算的响应与观察到的损坏或没有损坏，（3）研究长周期分量的现场放大对海湾泥浆上建造的储罐晃动现象和摇摆运动的影响，（4）研究改装储罐的损坏情况以推断原因由于实施的效果不佳改造机制；(5) 诱发地震力与现有规范和标准（例如 API 650、AWWA 100 和 UBC）规定的地震力的比较。 通过将预测响应与地震荷载下的实际行为进行比较，将完善为储罐响应计算而开发的分析方法，并开发改进的设计程序。