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

该奖项的研究目标是表征与地震建筑物损坏无关的能量耗散能力。该项目采取多管齐下的办法来实现这一目标。在分析方面，它检查如何识别等效阻尼是受激励频率内容（因为实际的机制是不太可能粘性），以及如何采样率和各种识别算法的自由参数影响计算的虚部的极点，这决定了等效阻尼。 由于该项目的工作是确定与非破坏性机制相关的耗散，因此该项目着眼于数据驱动的方法，将观察到的反应分类为准线性或明显的非线性。该项目包括一个程序的开发，从控制理论的经典跟踪问题的基础上，从总耗散分离的非破坏性耗散。从乔治E.小布朗地震工程模拟网络（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补充，用于制定新结构和现有结构阻尼比的指导方针。 该项目的数据将通过NEES项目仓库数据存储库（http://www.nees.org）存档并向公众提供。该项目是设计有效方法的努力的一部分，这些方法提供的结构设计不仅为大地震提供生命保护，而且还最大限度地减少与各种规模地震事件相关的经济损失。 虽然计算能力和弹性和非弹性行为的建模，包括循环响应，在过去的几十年中有了显着的改善，但自20世纪60年代以来，在非破坏性相关耗散的规范标准方面几乎没有发生变化，这对于预测中小事件的响应起着重要的作用。该项目利用NEES项目仓库数据库中现有的数据来约束地震工程中非损伤相关耗散问题的分析研究。该奖项包括一个教育推广计划，将研究与本科生和高中生的教育相结合。 该奖项是国家减少地震灾害计划（NEHRP）的一部分。

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).