NEESR: Ultra-Low Forced Vibration Testing

该奖项的研究目的是研究极低振幅强迫振动测试（FVT）的可行性，以确定低层建筑的结构动力特性。为了实现这一目标，研究人员将使用一个非常小的30磅谐波载荷来震动一个全尺寸的五层建筑测试样本，该样本是美国国家科学基金会授予CMMI-0936505的一部分，位于加州大学圣地亚哥分校的乔治·e·布朗地震工程模拟网络（NEES）室外振动台上。超低强迫振动测试（UL-FVT）的结果，即固有频率、模态振型和阻尼比，将与振动台测试结果和使用更大激振器的强迫振动测试（UL-FVT）进行比较。比较将在试样测试的多个阶段进行。这项研究具有潜在的变革性，因为它将首次定义UL-FVT的限制和适用性。该项目的数据将通过NEES项目仓库/数据存储库（http://www.nees.org）存档并提供给公众。该奖项将影响K-12，本科生，研究生和实践工程师的地震工程教育。UL-FVT的验证将为这一概念提供证据，并将成为将UL-FVT引入全国大学课堂的垫脚石。UL-FVT方法将通过允许教师和学生在与典型FVT相关的一小部分时间和成本下探索全尺寸、真实世界结构的动力学，从而改善结构动力学教育。学习模块将为K-12、本科生和研究生开发，并在NEESacademy的http://www.nees.org上存档。这项工作还将推动地震工程领域的发现，使实践工程师能够验证他们的线性计算模型用于新设计和改造应用。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 investigate the feasibility of extremely low amplitude forced vibration testing (FVT) to determine the structural dynamic properties of a low-rise building. To achieve this objective, the researchers will use a very small, 30-pound harmonic load to shake a full-scale, five-story building test specimen, constructed as part of NSF award CMMI-0936505, on the George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) outdoor shake table at the University of California, San Diego. The results of the ultra-low (UL) forced vibration testing (UL-FVT), namely, the natural frequencies, mode shapes, and damping ratios, will be compared to shake table test results and FVT using much larger shakers. The comparison will be made at multiple stages of the specimen testing. This research is potentially transformative in that it will for the first time define the limits and applicability of the UL-FVT. 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. This award will impact earthquake engineering education of K-12, undergraduate, and graduate students and practicing engineers. Verification of the UL-FVT will provide proof of the concept and will serve as a stepping stone to introducing the UL-FVT into university classrooms nationwide. The UL-FVT method will improve structural dynamics education by allowing faculty and students to explore the dynamics of full-scale, real-world structures at a fraction of the time and cost associated with typical FVT. Learning modules will be developed for K-12, undergraduate, and graduate students and archived in the NEESacademy at http://www.nees.org. This work will also advance discovery in the field of earthquake engineering by enabling practicing engineers to verify their linear computational models for both new designs and retrofit applications. This award is part of the National Earthquake Hazards Reduction Program (NEHRP).