Large-Scale Mobile Shakers and Associated Instrumentation for Dynamic Field Studies of Geotechnical and Structural Systems

用于岩土和结构系统动态现场研究的大型移动振动台和相关仪器

• 批准号: 0086605
• 负责人: Kenneth Stokoe
• 金额: $ 293.7万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Cooperative Agreement
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-10-01 至 2004-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0086605&HistoricalAwards=false
• 关键词: Large; Scale; Mobile; Shakers; Associated

CMS-0086605StokoeThe Network for Earthquake Engineering Simulation (NEES) Program is a project funded under the NSF Major Research Equipment Program. This cooperative agreement, under the NEES Program, establishes a NEES earthquake engineering field experimentation site at the University of Texas (UT) at Austin. UT will design, purchase, construct, install, commission, and operate new mobile, large-scale field equipment for geotechnical and structural earthquake engineering experimentation. This equipment will be operational by 2004 or earlier and will be managed as a national shared-use NEES equipment site, with telepresence capabilities, to provide new earthquake engineering research testing capabilities through 2014. This NEES equipment site will be connected to the NEES collaboratory through a high performance network. Shared-use access and training will be coordinated through the NEES Consortium. This award is an outcome of the peer review of proposals submitted to program solicitation NSF 00-6, NEES: Earthquake Engineering Research Equipment. Understanding of the response of near-surface geologic materials to earthquake loading is essential to the design of new structures and the remediation of existing structures. Currently, prediction of soil liquefaction and subsidence, lateral spreading, and site amplification are based on small-strain laboratory and field testing, which does not duplicate the nonlinear strain levels that occur during major earthquakes. Mobile, large-scale field equipment will be developed to produce dynamic motion in the ground comparable to that produced during earthquakes. This equipment includes a large three-dimensional mobile shaker; two cubical, stand-alone three-dimensional shakers; an instrumentation van with field equipment and multi-channel data acquisition and processing systems; and communications equipment for teleparticipation. The large, 3-D mobile shaker will have the ability to generate up to 267 kN (60,000 lb) of force in the vertical direction over a frequency range of 11 to 200 Hz and up to 133 kN (30,000 lb) of force in the horizontal direction over a frequency range of 5 to 200 Hz. The two stand-alone cubical shakers will also be able to generate force in either the horizontal or vertical direction. One cubical shaker will generate forces of 18 kN (4000 lb) over frequencies from 2.6 to 800 Hz, and the other shaker will generate forces of 57 kN (12,800 lb) over frequencies from 0.7 to 125 Hz. They will be used inside buildings and on top of liquefiable deposits. Specific instrumentation will include low and high frequency accelerometers, triaxial 1-Hz geophones, pore pressure transducers, high-speed data acquisition, waveform recorder signal processing capabilities, and wireless technology. The equipment will be based at UT, but will be truck mounted and portable for relocation throughout the U.S. as NEES shared use equipment. The equipment will be used for: 1) characterizing the nonlinear earthquake performance and liquefaction resistance of geomaterials in situ; 2) effective and efficient 3-D imaging of significant zones of the geotechnical environment, including depths of 300 to 500 m over distances of 1 to 2 km; and 3) investigating and documenting the dynamic response of large-scale or full-scale foundations or structures in actual geotechnical settings. Field experiments using this equipment will significantly enhance our fundamental knowledge of earthquake effects associated with geomaterials, thereby reducing loss-of-life and economic losses from future earthquakes. UT will integrate this field equipment into its research program and undergraduate and graduate curricula and provide training opportunities for outside researchers.

CMS-0086605StokoEthe地震工程模拟网络（NEES）计划是根据NSF主要研究设备计划资助的项目。 根据NEES计划，该合作协议在德克萨斯大学奥斯汀分校（UT）建立了NEES地震工程现场实验地点。 UT将设计，购买，建造，安装，佣金和操作新型移动，大规模现场设备，用于岩土技术和结构地震工程实验。 该设备将在2004年或更早之前运行，并将作为具有远程悬念功能的国家共享使用NEES设备网站进行管理，以在2014年提供新的地震工程研究测试功能。该NEES设备网站将通过高性能网络连接到NEES协作。 共享使用访问和培训将通过NEES联盟进行协调。 该奖项是提交给计划招标NSF 00-6的提案的同行评审的结果：地震工程研究设备。 了解近地面地质材料对地震载荷的响应对于新结构的设计和现有结构的修复至关重要。 目前，土壤液化和沉降，侧向扩散以及位点扩增的预测是基于小型晶体实验室和现场测试的，这些实验室和现场测试并未复制大地震期间发生的非线性应变水平。 将开发移动大规模现场设备，以在地震中与地震产生的动态运动产生动态运动。 该设备包括大型三维移动振动筛；两个立方，独立的三维振手者；带有现场设备和多通道数据采集和处理系统的仪表式货车；和通信设备用于远程改动。 大型3-D移动振动筛将能够在11至200 Hz的频率范围内在垂直方向上产生多达267 kN（60,000磅）的力，并且在5至200 Hz的频率范围内，在水平方向上最多可在133 kN（30,000 lb）的力上产生力。 两个独立的立方振动器也将能够沿水平或垂直方向产生力。 一个立方振动筛将在2.6至800 Hz的频率上产生18 kN（4000磅）的力，而另一个振动器将在0.7至125 Hz的频率上产生57 kN（12,800 lb）的力。 它们将用于建筑物内和液化沉积物的顶部。 特定的仪器将包括低频和高频加速度计，三轴1-Hz地球器，孔隙压力传感器，高速数据采集，波形录音机信号处理能力和无线技术。 该设备将位于UT，但将安装卡车和便携式设备，可随着NEES共享使用设备的搬迁。 该设备将用于：1）表征地震的非线性地震性能和液化性的抗性； 2）对岩土工程环境的重要区域的有效有效的3-D成像，包括在1至2 km的距离内300至500 m的深度； 3）研究和记录实际岩土工程环境中大型或全尺度基础或结构的动态响应。 使用该设备的实地实验将大大增强我们对与地震材料相关的地震影响的基本知识，从而减少未来地震的丧生和经济损失。 UT将将此现场设备整合到其研究计划，本科和研究生课程中，并为外部研究人员提供培训机会。