Modeling of Combined Deterioration of Concrete Structures by CompetingHazard Model

摘要

In asset management of infrastructures, predicting deterioration of structures is one of an essentialtechnique. However, in order to estimate their deterioration process with high accuracy, not onlysingle cause deterioration but also combined deterioration appearing on for example concretestructures has to be considered. Therefore this paper addresses the competing hazard model whichis possible to model complex deterioration by multiple causes, and especially focuses on thatdeterioration by neutralization and salt attack on concrete bridges. Specially, separatelydeteriorations by them are formulated by the Weibull hazard model that can express the timedependentdeterioration phenomena. Employing this model, the phenomena of which deteriorationprobability is increasing with time can be described. Furthermore, the complex deterioration isformulated by neutralization hazard rate's linearly affecting salt attack one.