NEESR: Ultra-Low Forced Vibration Testing

该奖项的研究目标是调查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磅的谐波载荷来摇动一个全尺寸的，五层楼高的建筑测试样本，作为NSF奖项CMMI-0936505的一部分，在乔治E。小布朗位于圣地亚哥的加州大学地震工程模拟网络（NEES）室外振动台。 超低（UL）强迫振动试验（UL-FVT）的结果，即固有频率、振型和阻尼比，将与振动台试验结果和使用更大振动器的FVT进行比较。 将在样本试验的多个阶段进行比较。 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http://www.nees.org上的NEES项目仓库/数据库进行存档并向公众提供。该奖项将影响K-12、本科生、研究生和执业工程师的地震工程教育。 UL-FVT的验证将提供概念的证明，并将作为将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以与典型FVT相关的时间和成本的一小部分探索全尺寸真实世界结构的动力学来改善结构动力学教育。将为K-12，本科生和研究生开发学习模块，并在NEESacademy中存档，网址为http://www.nees.org。这项工作还将通过使执业工程师能够验证其新设计和改造应用的线性计算模型来推进地震工程领域的发现。 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).