ABSTRACT
Recently, many researches have been made on health monitoring of existing structures such as buildings, bridge and other civil structures. Many structures are becoming superannuated and deteriorated. Furthermore, in Japan, natural disasters like typhoon and earthquake have occurred frequently so that the damage assessment of existing structures is very important. In order to evaluate the damage state of structures, health monitoring technology is quite promising to provide useful information. In the health monitoring, there are still some problems in modeling, analysis and experimental examination for practical use. In general, it is impossible to detect the existence of deterioration and identify the position of deterioration from only the observed information of displacement. However it becomes possible to do them if the information of displacement of intact situation is available. Of course, accurate analysis or model examination is inevitable to obtain the displacement of intact situation. Then, it requires a lot of time and cost.
