NEESR: Next Generation Dissipation Guidelines for New and Existing Structures using the NEES Database

NEESR：使用 NEES 数据库的新结构和现有结构的下一代耗散指南

• 批准号: 1134997
• 负责人: Dionisio Bernal
• 金额: $ 16.16万
• 依托单位: Northeastern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-15 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1134997&HistoricalAwards=false
• 关键词: NEESR; Next; Generation; Dissipation; Guidelines

The research objective of this award is to characterize energy dissipation capacity not associated with damage in buildings subjected to earthquakes. The project takes a multi-prong approach to attain this objective. On the analytical side, it examines how identified equivalent damping is affected by excitation frequency content (since the actual mechanism is unlikely viscous) and how sampling rate and the free parameters of various identification algorithms affect the computed imaginary part of the poles, which determines the equivalent damping. Because the effort is on identifying dissipation associated with non-damaging mechanisms, the project looks at data-driven means to classify observed responses as being quasi-linear or notably non-linear. The project includes development of a procedure, based on the classical tracking problem from control theory, to separate the non-damaging dissipation from the total dissipation. The database from the George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) Project Warehouse is used to validate the analytical studies and, complemented with data measured in buildings in the field, is used to formulate guidelines for specifying damping ratios for new and existing structures. Data from this project will be archived and made available to the public through the NEES Project Warehouse data repository at http://www.nees.org. The project is part of efforts to devise efficient means to provide structural designs that not only provide life protection for large earthquakes but also minimize economic losses associated with exposure to seismic events of all sizes. Although computational capability and modeling of elastic and inelastic behavior, including cyclic response, has improved notably in the past few decades, little change has taken place since the 1960's on criteria for the specification of non-damaging related dissipation, which plays an important role for predicting response for small and moderate events. This project leverages data that is currently available in the NEES Project Warehouse data repository to constrain analytical research on the question of non-damage related dissipation in seismic engineering. This award includes an educational outreach initiative that integrates the research with education for undergraduate and high school students. This award is part of the National Earthquake Hazards Reduction Program (NEHRP).

该奖项的研究目标是表征与地震遭受的建筑物中与破坏无关的能量。该项目采用多支出的方法来实现这一目标。在分析方面，它检查了识别的等效阻尼受激发频率含量的影响（因为实际机制不太可能是粘性），以及采样率和各种识别算法的自由参数如何影响杆的计算假想部分，从而决定了等效阻尼。 由于努力是在识别与非损害机制相关的耗散方面，因此该项目着眼于数据驱动的方法，将观察到的响应分类为准线性或尤其是非线性。该项目包括基于控制理论的经典跟踪问题的制定程序，以将非损害耗散与总耗散区分开。来自George E. Brown的数据库，地震工程模拟网络（NEES）项目仓库用于验证分析研究，并与现场建筑物中测量的数据相辅相成，用于制定指定指南，以指定新结构和现有结构的阻尼比。 该项目的数据将通过http://www.nees.org的NEES Project仓库数据存储库进行存档并提供给公众。该项目是设计有效手段的一部分，以提供结构性设计，不仅为大地震提供生命保护，而且还可以最大程度地减少与暴露于各种大小的地震事件相关的经济损失。 尽管包括循环响应在内的弹性和非弹性行为的计算能力和建模在过去几十年中取得了显着改善，但自1960年代以来，自1960年代以来，几乎没有发生任何变化，即针对非损害相关耗散的标准，这对于预测小型和中度事件的响应起着重要作用。该项目利用NEES Project Warehouse数据存储库中目前可用的数据来限制对地震工程中非损害相关耗散问题的分析研究。该奖项包括一项教育外展计划，该计划将研究与本科和高中生的教育融合在一起。 该奖项是国家地震危害计划（NEHRP）的一部分。