近似直線運動機構に基づく制振構造を有する鋼療造骨組の塑性設計

摘要

本論文では，文献7）で提案したU形ダンパー付き制振構造を対象 として，塑性崩壊荷重を導出するとともに，2つの制振部材配置型 を想定し塑性設計を検討した。さらに，骨組の終局挙動を検討する ため有限要素解析を行った。以下に結論をまとめる。 （1）u形ダンパーに3つの塑性ヒンジを考慮した崩壊メカニズム を想定して，制振構造架構の塑性崩壊荷重を導出した。文献 7）に示した実験結果と比較したところ，6試験体のうち5試験 体で崩壊荷重を10％程度低く評価することを確認した。%This paper presents a plastic design method of steel frames with a vibration control system with U-shaped steel dampers based on a quasi-linear motion mechanism. Firstly, a plastic collapse load of the damper system is evaluated using the upper bound theorem where the U-shaped dampers are assumed to have three plastic hinges. The accuracy of the evaluation is examined by comparing the cyclic loading test results. Secondly, the plastic design is discussed for steel frames considering some collapse mechanisms. The shear stress in the beam web is also discussed for the beam attached with the U-shaped dampers. Finally, for the sake of introducing the proposed device into the practice, nonlinear finite element analyses are conducted for the three-story three-span steel moment frames with and without the damper system. Relationships between the story shear and story drift obtained from the static pushover analysis are examined. The Von-Mises stress distributions are also examined to reveal the influence of the proposed device on the steel moment frame.