Proc. SPIE. 5768, Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems IV
KEYWORDS: Global Positioning System, Earthquakes, Signal to noise ratio, Calcium, Data acquisition, Fourier transforms, Electroluminescence, Mathematical modeling, Data transmission, Structural engineering
This paper presents recent developments and approaches (using GPS technology and real-time double-integration) to obtain displacements and, in turn, drift ratios, in real-time or near real-time to meet the needs of the engineering and user community in seismic monitoring and assessing the functionality and damage condition of structures. Drift ratios computed in near real-time allow technical assessment of the damage condition of a building. Relevant parameters, such as the type of connections and story structural characteristics (including geometry) are used in computing drifts corresponding to several pre-selected threshold stages of damage. Thus, drift ratios determined from real-time monitoring can be compared to pre-computed threshold drift ratios. The approaches described herein can be used for performance evaluation of structures and can be considered as building health-monitoring applications.