Seismic response control and residual deformation measure for large space lattice shell roofs using shape memory alloy

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K15141
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 23010:Building structures and materials-related
• Research Institution: Nippon Institute of Technology
• Principal Investigator: Minowa Ken'ichi 日本工業大学, 建築学部, 准教授 (70733830)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 形状記憶合金 / 超弾性合金 / 地震応答制御 / アーチ構造物 / 減衰性能 / 振動実験 / 繰返し圧縮実験 / 残留変形対策

Outline of Final Research Achievements

Numerical analysis was performed on a large-space lattice shell roof in which shape memory alloys were placed as braces, and the seismic response reduction effect as damping materials was grasped. In addition, by analyzing the difference in damping effect depending on placement methods of shape memory alloys, the placement method with high vibration damping effect was clarified.
Furthermore, the effect of the vibration control method proposed in this study was demonstrated by conducting vibration tests using a scale model of arch structure. I also demonstrated that it is possible to take measures against residual deformation as well as vibration damping by repeated compression tests on brace materials using super elastic alloys.

Free Research Field

建築構造

Academic Significance and Societal Importance of the Research Achievements

集客地さらには避難所として利用され社会的に重要な役割を果たす大空間ラチスシェル屋根において，形状記憶合金を用いた新たなる制振手法の開発をすることで，更なる安全性の向上が期待でき，社会的意義は高い。また，地震後に避難所として利用する際，構造物に残留変形が残っている場合，その構造物を利用して良いかどうかの判断が困難であるという問題に対し，本研究で開発した超弾性合金を用いたブレース材は，一般的に使用されている鋼材に比べ残留変形が生じにくく，その利用価値は高い。