Recently, maintenance of structures has become more and more important in many fields. A structure follows a life-cycle that consists of planning, design, construction, maintenance and replacement. In order to establish a rational and economic maintenance program, the concept of Life-Cycle Cost (LCC) has gained much more attention in engineering fields. In this paper, an attempt is made to develop a practical method based upon the adaptive genetic algorithm with Variable-Length chromosome (VL-GA) for an optimal maintenance planning of many concrete bridges based upon life-cycle cost. A numerical example is presented to demonstrate the applicability and efficiency of the proposed method.

抄録全体を表示

It is well known that the stmetures forming infrastructures are influenced and deteriorated with the many mechanical and chemical factors. Specially, the peeling of the concrete pieces from reinforced concrete is one of the most emergency problems of reinforced concrete. The one popular method of counter measure to prevent the falling of concrete pieces is the arrangement lining on the reinforced concrete members. In the lining method, many materials which are FRP, polymers, resin mortar, steel and so on are used.
Recently, it is thought that the urea system elastomer is a new material applied on the concrete lining. The urea system elastomer has good chemical resistance and large deformation capacity. But the environmental durability of urea system elastomer is not known. Then the authors canied out some experiments and the discussions about the durability of urea system elastomer.

抄録全体を表示

In general, reinforced concrete structures are deteriorated with the many mechanical and chemical factors in its service period. Specially, the peeling of the concrete pieces from reinforced concrete becomes one of the most emergency problems of deterioration of reinforced concrete in these days. The one of the popular counter measures to prevent the falling of concrete pieces is the arrangement of lining on the surface of reinforced concrete members. In this method, many materials as FRP, polymers, mortar and so on are used.
Recently, the lining method is also used in the repair of concrete structures. However, the durability oflining is not clear in this case. Then the authors carried out some experiments and the discussions about the durability of lining as the repair method.

抄録全体を表示