RAPID/Collaborative Research: Japan-U.S. Collaboration on the Seismic Performance of Reinforced Concrete Structures

在美国和其他许多国家，钢筋混凝土(RC)结构构成了多户住宅的大部分。当建筑物遭受地震等灾难性事件时，有必要在事件发生后评估其结构安全水平。结构评估活动面临两个挑战--收集高质量的损坏数据，并以有意义和合理的方式解释所获得的数据--对被检查建筑的安全水平和剩余强度进行估计。虽然有先进的数据采集系统可用于收集结构损伤数据，但需要新的方法来分析收集的数据以评估结构性能。这笔快速反应研究补助金(RAPID)将支持来自华盛顿大学和内华达大学雷诺分校的研究人员团队，与日本大学的研究人员合作，进行实验研究，调查RC建筑系统的抗震性能。实验研究将包括对一座三层高的全尺寸RC建筑进行动态测试，这是正在进行的东京都复原力项目(TMRP)的一部分，该项目由日本文部科学省和国家地球科学与抗灾研究所支持。这些实验将于2019年12月在世界上最大的振动台--位于日本三木的E-Defense进行。这个快速项目的主要目标是获取、处理和分析与建筑结构和非结构构件有关的动态响应和损坏数据。这些数据将使用美国国家科学基金会支持的自然灾害工程研究基础设施快速设施(https://rapid.designsafe-ci.org/))和里诺内华达大学最近开发的高速、高分辨率数字图像相关(DIC)综合监测系统最近获得的设备来收集。对这些数据的处理和解释将促进建筑物震后结构评估的知识和实践状况。该项目将培训两名研究生和几名本科生进行结构完整性研究，并促进日本和美国研究人员之间的合作。所有收集的数据将被存档，并在国家科学基金会支持的国家医疗保险数据仓库(https://www.DesignSafe-ci.org/).)中公开提供此外，该项目的成果将通过期刊出版物、会议报告、公开网络研讨会和现场直播进行传播。该项目为国家科学基金会在国家减少地震灾害计划(NEHRP)中的作用做出了贡献。在这个快速项目中，日本和美国的研究团队将调查作为日本TMRP项目的一部分，在E-Defense振动台测试的全尺寸三层RC建筑系统的抗震性能。这个合作项目的主要目标是：(1)更好地了解RC建筑的动态响应，(2)调查新仪器捕获结构性能和损坏数据的能力，以及(3)评估当前的震后结构评估程序，并使用所获得的数据为改进提供信息。收集的数据和结构评估程序还将帮助美国、日本和其他国家的政策制定者从战略上和有效地规划改造工作。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。

Reinforced concrete (RC) structures comprise most of the multi-family residential buildings in the U.S. and many other countries. When buildings are subjected to catastrophic events such as earthquakes, there is the need to assess their level of structural safety after the event. Structural assessment activities present two challenges - collecting high quality damage data and interpreting the acquired data in a meaningful and rational way - to produce estimates of the level of safety and residual strength of the inspected building. While advanced data acquisition systems are available to collect structural damage data, new methods are needed to analyze the collected data to assess structural performance. This Grant for Rapid Response Research (RAPID) will support a team of researchers from the University of Washington and the University of Nevada, Reno, to collaborate with researchers from Japanese universities on experimental research investigating the seismic performance of RC building systems. The experimental research will involve the dynamic testing of a full-scale, three-story RC building as part of the ongoing Tokyo Metropolitan Resilience Project (TMRP) supported in Japan by the Ministry of Education, Culture, Sports, Science and Technology and the National Research Institute for Earth Science and Disaster Resilience. The experiments will be conducted at the world's largest shake table, E-Defense in Miki, Japan, in December 2019. The main goal of this RAPID project is to acquire, process, and analyze dynamic response and damage data pertaining to both structural and non-structural elements of the building. The data will be collected using equipment recently acquired by the NSF-supported Natural Hazards Engineering Research Infrastructure (NHERI) RAPID Facility (https://rapid.designsafe-ci.org/) and the high-speed, high-resolution digital image correlation (DIC) integrated monitoring system recently developed at the University of Nevada, Reno. The processing and interpretation of this data will advance the state of knowledge and practice in post-earthquake structural assessments of buildings. The project will train two graduate students and several undergraduate students in structural integrity research and promote collaboration between Japanese and U.S. researchers. All collected data will be archived and made publicly available in the NSF-supported NHERI Data Depot (https://www.DesignSafe-ci.org/). Additionally, the results of this project will be disseminated via journal publications, conference presentations, a public webinar, and live broadcasts. This project contributes to NSF's role in the National Earthquake Hazards Reduction Program (NEHRP). In this RAPID project, the Japanese and U.S. research team will investigate the seismic performance of a full-scale, three-story RC building system tested at the E-Defense shake table as part of the Japanese TMRP project. The key objectives of this collaborative project are to: (1) provide better understanding of dynamic response of RC buildings, (2) investigate the capabilities of new instrumentation to capture structural performance and damage data, and (3) evaluate current post-earthquake structural assessment procedures and use the acquired data to provide information for refinements. The collected data and structural assessment procedures will also help policymakers in the U.S., Japan, and other countries to plan retrofit efforts strategically and effectively.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.