RAPID: Performance of Reinforced Concrete Structures with Externally Bonded Fiber Reinforced Polymer Composite Retrofits in the 2018 Anchorage, Alaska Earthquake

外粘结纤维增强复合材料(EBFRP)可用于结构的抗震加固，方法简单、经济。然而，缺乏关于它们在地震中表现的书面证据仍然限制了它们的广泛采用。这项快速反应研究拨款(RAPID)将研究2018年11月30日阿拉斯加安克雷奇发生的7.0级地震对钢筋混凝土建筑中EBFRP复合材料加固性能的影响。2018年的地震影响了1964年阿拉斯加大地震(9.2级)地面震动造成严重破坏的同一地区，为评估EBFRP在高烈度地震中的有效性并了解其性能提供了机会。这项研究将首次提供EBFRP加固结构在美国发生的地震中的性能信息。收集到的数据将有助于改进建筑翻新设计标准和施工实践，从而培育安全的建筑和社区，从而提高国家福利。这些发现将为从业者和研究人员提供一个独特的数据集，以对用于模拟改装结构响应的数值模型进行基准测试。这些数据将通过国家科学基金会支持的自然灾害工程研究基础设施(NHERI)数据仓库和侦察集成门户(https://www.DesignSafe-ci.org).)进行归档和传播参与该项目的研究生将在野外数据收集和震后勘察方面获得宝贵的研究成果。该奖项支持国家减少地震灾害计划。这笔赠款的主要目标是收集2018年阿拉斯加地震期间EBFRP反应的易腐烂数据，以提高对EBFRP加固结构性能的了解。在阿拉斯加安克雷奇与美国国家标准与技术研究所(NIST)协调开展的数据收集活动将包括以下内容：(1)一项调查，以确定采用EBFRP加固的钢筋混凝土结构，(2)关于EBFRP加固系统损坏(如分层、断裂和环境退化)的摄影文件，以及(3)利用无损(如声学探测和红外热成像)和半破坏性(如粘结拔出试验)方法鉴定EBFRP的现场特征。在允许的情况下，将收集EBFRP的小样本进行化学和热分析，以确定EBFRP的环境退化程度。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

Externally bonded fiber reinforced polymer (EBFRP) composites can be used to seismically retrofit structures in a simple and economical manner. However, lack of documented evidence of their performance during an earthquake still limits their widespread adoption. This Grant for Rapid Response Research (RAPID) will study the effects of the November 30, 2018, earthquake (magnitude 7.0) in Anchorage, Alaska, on the performance of EBFRP composite retrofits in reinforced concrete buildings. The 2018 earthquake, which impacted the same region that was severely damaged by the 1964 Great Alaskan earthquake (magnitude 9.2) ground shaking, provides an opportunity to evaluate the effectiveness of EBFRP retrofits in a high-intensity earthquake and learn about their performance. This study will, for the first time, provide information on the performance of EBFRP retrofitted structures in an earthquake that occurred in the United States. The collected data will contribute to improved building retrofit design standards and construction practices, which will cultivate safe buildings and communities resilient to earthquakes, thus promoting national welfare. The findings will benefit practitioners and researchers by providing a unique data set to benchmark the numerical models used to simulate the response of retrofitted structures. The data will be archived and disseminated through the NSF-supported Natural Hazards Engineering Research Infrastructure (NHERI) Data Depot and Reconnaissance Integration Portal (https://www.DesignSafe-ci.org). The graduate student participating in the project will gain valuable research raining in field data collection and post-earthquake reconnaissance. This award supports the National Earthquake Hazards Reduction Program. The main objective of this grant is to collect perishable data on EBFRP response during the 2018 Alaskan earthquake to improve understanding of the performance of EBFRP-retrofitted structures. The data collection activities in Anchorage, Alaska, coordinated with the National Institute of Standards and Technology (NIST), will include the following: (1) a survey to identify reinforced concrete structures that are retrofitted with EBFRP, (2) photographic documentation of damage to EBFRP retrofit systems (e.g., delamination, rupture, and environmental degradation), and (3) identification of in-situ characteristics of the EBFRP utilizing non-destructive (e.g., acoustic sounding and infrared thermography) and semi-destructive (e.g., bond pull-off test) methods. Where permissible, small samples of EBFRP will be collected for chemical and thermal analysis to determine the extent of environmental degradation in EBFRP.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.