Abstract
Structures are going to deteriorate from the beginning of its usage. The deteriorate function is modeled by two types in this paper and applied to the maintenance and repair management. The life cycle cost (LCC) of structures including maintenance and repair cost is minimized based on principle of minimum total cost theory. The spending cost in the life of structures has worth at each time. It is transferred to present worth to estimate the LCC. LCC is related to the safety level of structures. The optimum initial safety levels of structures that minimize the LCC are estimated in this paper. The structures are modeled to be subject to repeated loads.
