5 Real-Time and Web-Based Structural Damage Detection Network for Multiple Structures 45 5.5 System Testing and Validation Two laboratory structures at Qatar University (QU) and the University of Central Florida (UCF) were connected to the framework and monitored to run and test the proposed web-based system. Each laboratory structure was instrumented with five accelerometers for this exercise. Figure 5.5 shows the web application interface where the damage indices, vibration levels, and raw signals of monitored structures are displayed in real time. For demonstration purposes, the RMS value was shown to report the current acceleration levels for human comfort; yet other assessment methods can be integrated into the system. For the test runs, a negligible amount of rotational stiffness change (bolt loosening) was introduced at the second node of the QU structure. Based on this, one can notice that the system has detected and located the “structural damage” in real time by indicating an increased value for the damage indices (DI) assigned to the second node of the QU laboratory structure, as shown in Fig. 5.5. It is noted that the DI values for the other nodes remained very low, indicating that they are unaffected (undamaged) by the stiffness change on the second node. In other words, the bolt loosening was applied on the second node of the QU structure, and the system recognized this as an increased DI value for this node. Fig. 5.5 Real-time monitoring of Qatar University and the University of Central Florida laboratory structures
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