Today, it is in the tendency for maintenance administrative expenses to increase rapidly,.because infrastructure is getting too old for use. So introduction of asset management technology serves effectively as pressing need. Repairing to suitable timing is important, carrying out the monitoring of the deterioration of soundness of structure for that purpose. But in order that much uncertainty may follow on prediction, the making decisions method is still in the research way. In this research, focusing on a type of civil engineering structure that involves a particularly considerable number of uncertainties than others, namely tunnels, this study aims to develop basic components of a tunnel asset management system. It proposes a methodology of developing a model for quantitatively predicting the deterioration of actual performance based on tunnel lining inspection results and determining the repair timing, priorities and other factors by means of stochastic Poisson process.
In Japan, it is one of the critical issues to keep infrastructure facilities properly in service. Under such social situation the notion of applying asset management to the process of construction, maintenance and replacement of Civil engineering structures is attracting great attention as a new methodology to estimate the costs and benefits of such process as a whole. The fundamental concept in asset management would be to develop, effectively combine and operate three subsystems that consist of assets accounting, property management and inspection/repair. This paper focuses on one of these three, namely the property management.
The following issues need to be addressed comprehensively In order to develop a property management system:
Criteria for evaluating the current status of performance and functional level of structures
prediction of deterioration or future conditions against potential hazards
Monitoring of the performance and functional level of structures
Development of maintenance repair rules for right locations at the right time, including the evaluation of cost-effectiveness.
Considering the above, this study focuses on (i) performance evaluation criteria, (ii) deterioration prediction and (iii) repair rules, and also sheds some light on the modeling method for the basic components of the asset management system.
One of the biggest issues involved in modeling is the fact that civil engineering structures have various uncertainties. In particular, being extremely complex and having many uncertainties, no reliable condition prediction technique has yet been established for the deterioration process of rock structures. Under such circumstances, it has become a focus of research attention to address the applicability of financial engineering theory to this field, treating the uncertainty of deterioration process as a risk factor.
The road structure is the type of civil engineering structure to which the concept of asset management is currently being applied on an experimental basis. Needless to say, the road structure is categorized into the following: bridges, road surfaces (pavements) and tunnels. In the fields of bridges and road surfaces (pavements), certain researches have been reported, which developed models for the deterioration of member/materials or uncertainty of performance
