关键词：
Genetic algorithms
摘要：
Recently, the environmental impact has been required to be explicitly taken into account in the life cycle design of building structures besides the initial economical efficiency which has been ordinarily required up to the present days. Consequently, it is important not only to design the building structures so as to be safe as well as economical at the initial stage of completion of the building but also to pay attention and take into account the total behaviors of the designed and constructed building structures during all stages of their life cycles. The former paper by the authors has proposed the way to deal with the life cycle design of building structures with consideration of a hierarchy according to the ranks of building construction systems by using genetic algorithms as the optimization scheme with respect to both ecology and economy for evaluations. Authors have been developing computational software for the life-cycle design of structures through utilization of Genetic Algorithm. In this paper, the presumption method for the lifetime of structures is introduced, by which easy usage as well as practicality of the tool are expected. For evaluation of the lifetime of structures, the lifetime of each portion is individually evaluated where surrounding situations of them, such as near from water, exposed to outside of building and so on, are taken into consideration. This newly introduced treatment is expected to exclude the arbitrariness on the evaluation time of the life-cycle design and make the tool much more suitable for practical use.
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