Abstract
There are large uncertainties in progress of deterioration of structures depending on their environment and characteristics. This study proposes a method to perform grouping and regression of a group of deterioration curves with respect to age of structure at the same time statistically. The deterioration is expressed by two parameters, i.e, health index and characteristic index. The proposed method can be interpreted as multi-objective regression method with combination of PSO (Paricle Swarm Optimization) method and EM (Expectation Maximization) algorithm. Since heavily deteriorated sutructures tend to have larger uncertainties, the uncertainty around the regression curve is formulated depending on progress of deterioration. The proposed mehod is applied to inspection data about bridges in Gifu prefecture. The result shows good agreement with grouping and regression result performed independently with detailed information.
