NEESR: Ultra-Low Forced Vibration Testing

NEESR：超低受迫振动测试

• 批准号: 1135037
• 负责人: Cole McDaniel
• 金额: $ 5.83万
• 依托单位: California Polytechnic State University Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-01 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1135037&HistoricalAwards=false
• 关键词: NEESR; Ultra; Low; Forced; Vibration

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).

该奖项的研究目的是研究极低振幅受迫振动测试（FVT）以确定低层建筑结构动力特性的可行性。 为了实现这一目标，研究人员将使用非常小的 30 磅谐波负载来摇动全尺寸五层建筑测试样本，该测试样本是作为 NSF 奖项 CMMI-0936505 的一部分在 George E. Brown, Jr. 上建造的加州大学圣地亚哥分校的地震工程模拟网络 (NEES) 户外振动台。 超低 (UL) 受迫振动测试 (UL-FVT) 的结果，即固有频率、振型和阻尼比，将与振动台测试结果和使用更大振动台的 FVT 进行比较。 比较将在样本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。 该项目的数据将被存档并通过 NEES 项目仓库/数据存储库 (http://www.nees.org) 向公众开放。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 的验证将提供这一概念的证明，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来探索全尺寸、真实世界结构的动力学，从而改善结构动力学教育。将为 K-12、本科生和研究生开发学习模块，并存档在 NEESacademy（网址为 http://www.nees.org）中。这项工作还将通过使实践工程师能够验证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。 该奖项是国家地震减灾计划（NEHRP）的一部分。