Field Testing & Monitoring of Structural Performance

小乔治·E·布朗。地震工程模拟网络(NEES)计划是美国国家科学基金会重大研究设备计划资助的一个项目。根据NEES计划，这项合作协议在加州大学洛杉矶分校(UCLA)建立了一个NEES设备站点，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、委托和运营一个移动现场实验室，用于全尺寸结构的强迫振动测试和地震余震监测。该设备将在2004年9月30日或更早之前投入使用，并将作为具有远程参与能力的国家共享NEES设备场地进行管理，以通过实地试验和监测提供新的地震工程研究能力。这个NEES设备站点将通过大学的Abilene Internet2连接连接到NEES协作室，具有1 Gb/秒的能力。共享使用准入和培训将通过NEES联盟进行协调。该奖项是对提交给NSF 00-6计划征集项目“NEES：地震工程研究设备”的建议进行同行评审的结果。在本奖项下提供下列设备：(1)四个最先进的强迫振动源，包括一个在0.1-4.2赫兹的频率范围内最大力为10Kips(连续运行)和20Kips(间歇运行)的全方位偏心质量振动器，两个最大力为100Kips和频率范围为0-25赫兹的单向偏心质量振动器，以及一个最大力为5Kips的线性惯性振动器，以及在宽频率范围(0-60赫兹)上可编程的任意力(或加速度)时间历史，(2)无线传感器和数据采集系统(加速计，这些设备包括：(1)一台装有光纤传感器、光纤厚度读出装置、数字化仪、路由器和工作站)的钻机；(3)一辆装有地震压电式推进器、20吨液压推进力、侧螺旋钻机和现场土壤振动传感器的贯入式推进车；以及(4)联网设备(数据集中器、卫星上行链路站)，以便对实验结果进行实时数据采集、处理和万维网广播。大型传感器阵列将被放置在建筑物和周围的地基土壤中，以获得以前不可能获得的高空间和时间分辨率的详细响应数据。这些结构将使用线性和偏心振动系统在线性和非线性范围内进行激励，或者在某些情况下，使用带有致动器的准静态加载。所获得的数据将有助于更好地理解线性和非线性响应机制(包括损伤局部化、土-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全面实现基于性能的地震工程范式所必需的改进的数值模型。该设备还可用于结构在大地震时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实地测试设施整合到本科生和研究生的课程和研究计划中，让学生在导师的指导下进行震后勘察，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.