LCC-based optimum seismic design of RC structures of JR

This study discussed reasonable seismic design systems and design solutions with consideration given to the social background where transition to performance-based design methods is promoted. The specifications for seismic design of structures were significantly revised after the Hyogoken-Nanbu Earthquake in 1995, and the concept of performance-based design is being introduced. As presented in the restoration works after the earthquake, the repairability is one of the most important performances of structures. As an index of the repairability, the repair cost for the damages sustained by L2 earthquake motions is considered. The life-cycle cost is defined as the summation of initial construction cost and repair cost, and is the objective function here. The design problem is solved by Genetic Algorithms (GA), and the effect of considering the repair cost initially is studied. It is concluded that the designs of structure are affected considerably by the repair cost.