Field Testing & Monitoring of Structural Performance

乔治E.小布朗地震工程模拟网络（NEES）计划是美国国家科学基金会主要研究设备计划资助的一个项目。 根据NEES计划，该合作协议在洛杉矶的加州大学（UCLA）建立了一个NEES设备现场，用于现场测试和监测结构性能。 加州大学洛杉矶分校将设计、建造、安装、调试和运营一个移动的现场实验室，用于全尺寸结构的强迫振动测试和地震余震监测。 该设备将于2004年9月30日或更早投入使用，并将作为国家共享使用的NEES设备站点进行管理，具有远程参与能力，通过现场实验和监测提供新的地震工程研究能力，直到2014年。 该NEES设备站点将通过大学的Abilene Internet 2连接连接到NEES合作实验室，具有1 Gb/sec的能力。 共享使用的访问和培训将通过NEES联盟进行协调。 该奖项是对提交给NSF 00-6“NEES：地震工程研究设备”项目招标的提案进行同行评审的结果。“根据这项裁决提供了下列设备：（1）四个最先进的强迫振动源，包括一个最大力为10 kips的全方位偏心质量振动器（连续运行）和20 kips（间歇操作）在0.1- 4.2Hz的频率范围内，两个单向偏心质量振动器，最大力为100 kips，频率范围为0-25 Hz，和一个线性惯性振动台，最大力为5 kips，可编程任意力（2）无线传感器和数据采集系统（加速度计、LVDT、光纤计读出单元、数字化仪、路由器和工作站），（3）配备有地震压电锥的锥贯入卡车，20吨液压推进能力，侧钻，和原位土壤振动传感器，和（4）网络设备（数据集中器，卫星上行站），以允许实时数据采集，处理，和万维网广播的实验结果。 大型传感器阵列将被放置在建筑物和周围的地基土壤中，以获得高空间和时间分辨率的响应数据，这些数据的详细程度以前是不可能的。 这些结构将被激发在线性和非线性范围内使用线性和偏心振动系统，或在某些情况下，使用准静态加载与致动器。 所获得的数据将导致更好地理解线性和非线性响应机制（包括损伤定位，土壤-结构-基础相互作用效应和非结构参与），并将有助于开发和验证改进的数值模型，这些模型对于充分实现基于性能的地震工程范例是必不可少的。该设备还可用于大地震时结构的强迫振动实验和余震监测。加州大学洛杉矶分校将把这一现场测试设施纳入其本科生和研究生课程和研究计划，在导师的指导下，让学生参与震后侦察，并为外部研究人员提供培训机会。

The George E. Brown, Jr. 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 at the University of California, Los Angeles (UCLA), a NEES equipment site for field testing and monitoring of structural performance. UCLA will design, construct, install, commission, and operate a mobile field laboratory for forced-vibration testing and earthquake aftershock monitoring of full-scale structures. This equipment will be operational by September 30, 2004 or earlier and will be managed as a national shared-use NEES equipment site, with teleparticipation capabilities, to provide new earthquake engineering research capabilities through field experimentation and monitoring through 2014. This NEES equipment site will be connected to the NEES collaboratory through the University's Abilene Internet2 connection, with 1 Gb/sec capabilities. 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." The following equipment is provided under this award: (1) four state-of-the-art forced vibration sources that include one omni-directional eccentric mass vibrator with maximum force of 10 kips (continuous operation) and 20 kips (intermittent operation) over a frequency range of 0.1-4.2 Hz, two uni-directional eccentric mass vibrators with maximum force of 100 kips and frequency range of 0-25 Hz, and one linear inertial shaker with maximum force of 5 kips and programmable arbitrary force (or acceleration) time histories over a wide frequency range (0-60 Hz), (2) wireless sensor and data acquisition system (accelerometers, LVDT's, fiber optic gage readout unit, digitizers, routers, and workstations), (3) a cone penetration truck, equipped with a seismic piezocone, 20-ton hydraulic push capacity, side augers, and in situ soil vibration sensors, and (4) networking equipment (data concentrator, satellite uplink station) to allow for real-time data acquisition, processing, and world wide web broadcasting of experimental results. Large arrays of sensors will be placed in buildings and the surrounding foundation soils to obtain high spatial and temporal resolution response data at levels of detail that have not been previously possible. These structures will be excited in the linear and nonlinear range using linear and eccentric shaker systems, or in some cases, using quasi-static loading with actuators. The data obtained will lead to a better understanding of linear and nonlinear response mechanisms (including damage localization, soil-structure-foundation interaction effects, and nonstructural participation), and will aid in the development and verification of improved numerical models indispensable for the full realization of the performance-based earthquake engineering paradigm. The equipment can also be used for forced vibration experiments and aftershock monitoring of structures in the event of a large earthquake. UCLA will integrate this field testing facility into its undergraduate and graduate curricula and research program, post-earthquake reconnaissance involving students under the guidance of a mentor, and provide training opportunities for outside researchers.