柱梁接合部の溶接費と施工性を考慮した鋼構造物の最適設計

摘要

Structural design is usually carried out with a number of repetitive processes in which trial and error between assumptions at each stage on the structural system is done toward the selection of final solutions with an enormous effort of engineers. The authors proposed a design supporting scheme which could center their ability on the essential design processes by saving time for the selection with the use of Multi-Objective Genetic Algorithm (MOGA). In addition, through the various analyses of the steel structure models such as rigid-frame, X-type braced frame and K-type braced frame, it has been clearly shown that we can obtain other alternative design solutions with lower cost and proper drift angle in the proposed structural system. In this paper, the proposed supporting design scheme will be extended and confirmed its validity with considering not only manufacture cost in the process for making steel members and the welding cost for connecting beams and columns as well as steel cost which is considered until now in the scheme but also the penalty function which is given to the optimization problem in order to ensure the constructability of the beam-column connection for more practical use of the supporting design scheme.%高速で大容量のコンピュータの効果的な利用により、構造計画における高度で複雑な解析が手軽にできるようになり、建築のデザインそのものに構造が深く関わる傾向が増している。その一方、環境問題への配慮や、建物の長寿命化など長期的な建築計画が希求され、多様化する建築の価値観の中で構造設計者の果たすべき役割は、多くの要素が相互に絡み合い、複雑で広範なものとなっている。そのため、構造計画は非常に重要な役割を担っており、その行為は、様々な建築計画や要求性能に対して、いくつもの構造システムを立案する創造行為と、その構造システムの様々な指標や力学的性質の分析行為および、構造システムを選定する判断行為という三つの思考行為の積み重ねと、多大な繰り返し作業により行われるのが一般的である。