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首页> 外文会议>Conference on Health Monitoring and Management of Civil Infrastructure Systems Mar 6-8, 2001, Newport Beach, USA >Instrumentation of Bridges for Long-Term Performance Monitoring
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Instrumentation of Bridges for Long-Term Performance Monitoring

机译：长期性能监控的桥梁仪表

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摘要

As the state of the art in bridge design is advancing toward the performance-based design, it becomes increasingly important to monitor and evaluate the long-term structural performance of bridges, including strains in critical structural members, soil pressures on the abutment back walls and footings, accelerations on the decks and bents, etc. Such information is essential in developing new performance criteria for design. In this research, sensor systems for long-term structural performance monitoring have been installed on two new highway bridges in Orange County, California: the Jamboree Road Overcrossing and the West Street On-Ramp. They include accelerometers, strain gauges, pressure sensors, displacement sensors, installed or embedded at strategic locations of both super- and sub-structures. Data recorders and power supplies have also been installed at the bridge sites. Preliminary vibration measurement and data analysis have been performed on these instrumented bridges. On the Jamboree Road Overcrossing, ambient vibration data have been collected, based on which natural frequencies and mode shapes have been extracted using various methods and compared with those obtained by the preliminary finite element analysis. On the West Street On-Ramp, braking and bumping vibration tests have been carried out using a water truck in addition to ambient vibration tests. Natural frequencies and mode shapes have been derived and the results by the breaking and bumping vibration tests have been compared.
机译：随着桥梁设计的最新发展向基于性能的设计发展，监视和评估桥梁的长期结构性能变得越来越重要，包括关键结构构件的应变，桥台后壁的土压力和这些信息对于制定新的设计性能标准至关重要。在这项研究中，用于长期结构性能监控的传感器系统已安装在加利福尼亚州奥兰治县的两座新公路桥梁上：Jamboree Road Overcrossing和West Street On-Ramp。它们包括加速度计，应变仪，压力传感器，位移传感器，它们安装或嵌入在上部结构和子结构的关键位置。数据记录器和电源也已安装在网桥站点。在这些仪器桥上已进行了初步的振动测量和数据分析。在Jamboree道路立交桥上，已收集了环境振动数据，并根据这些数据使用各种方法提取了固有频率和振型，并将其与通过初步有限元分析获得的结果进行了比较。在西街匝道上，除环境振动测试外，还使用洒水车进行了制动和碰撞振动测试。推导了固有频率和振型，并比较了断裂和碰撞振动测试的结果。

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