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GPS in dynamic monitoring of long-period structures
Authors:M  
Institution:

Earthquake Hazards Team, US Geological Survey, MS 977, 345 Middlefield Rd., Menlo Park, CA 94025, USA

Abstract:Global Positioning System (GPS) technology with high sampling rates (not, vert, similar10 samples per second) allows scientifically justified and economically feasible dynamic measurements of relative displacements of long-period structures—otherwise difficult to measure directly by other means, such as the most commonly used accelerometers that require post-processing including double integration. We describe an experiment whereby the displacement responses of a simulated tall building are measured clearly and accurately in real-time. Such measurements can be used to assess average drift ratios and changes in dynamic characteristics, and therefore can be used by engineers and building owners or managers to assess the building performance during extreme motions caused by earthquakes and strong winds. By establishing threshold displacements or drift ratios and identifying changing dynamic characteristics, procedures can be developed to use such information to secure public safety and/or take steps to improve the performance of the building.
Keywords:Monitoring  GPS  Strong-motion  Building  Structural response  Frequency  Displacement  Acceleration  Drift  Bridge  Long-period structure
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