ABSTRACT
As mentioned in Chapter 3, a variety of physical quantities are required to be measured in a smart civil structure, and accordingly many types of sensors are required to be installed in the structure. However, owing to the economic cost associated with sensing systems and the considerable size of a civil structure, sensors are often installed only at a few locations that are much less than the total degrees of freedom (DOFs) of the structure. Therefore, the optimal sensor placement (OSP) becomes a practical and interesting topic, and many methods have been proposed using a variety of techniques and criteria to find the OSP. On the other hand, the lack of information on the responses of a structure at its key locations, including the locations without sensors and the desired locations but not accessible for measurements during its operation, may subsequently hamper the accuracy of system identification and model updating, the reliability of damage detection and the effectiveness of structural control. Accurate response reconstruction at all key structural locations using limited measured responses becomes essential.
