Performance improvement and design method formulation of round steel bar dampers for steel frame structures

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04711
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 23010:Building structures and materials-related
• Research Institution: Hiroshima University
• Principal Investigator: Tagawa Hiroshi 広島大学, 先進理工系科学研究科(工), 教授 (70283629)
• Co-Investigator(Kenkyū-buntansha): 陳 星辰 広島大学, 先進理工系科学研究科(工), 助教 (00816564)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 制振構造 / 座屈拘束ブレース / 丸鋼ダンパー / 載荷実験 / 有限要素解析 / 建築構造 / 鋼構造骨組 / 設計法

Outline of Final Research Achievements

The results of this study outline as follows. (1) The beam-to-column welded connections with knee braces including buckling-restrained round steel bar dampers were investigated. Loading tests and finite element analyses revealed that the proposed system can spread the plasticity region at beam-ends. (2) The spine frame systems with buckling-restrained round steel dampers located between the column flanges were investigated. Cyclic loading tests revealed the hysteretic behavior and sufficient performance as energy dissipating devices. (3) Buckling-restrained braces using multiple round steel bar cores were investigated. This type of the brace enlarges the applicable range of the round steel bar core braces. Loading tests demonstrated the good performance of the proposed brace.

Free Research Field

建築構造学

Academic Significance and Societal Importance of the Research Achievements

建築物の大地震への備えに対する強い社会的要請を背景に、近年では地震被害軽減のためダンパーと呼ばれるエネルギー吸収部材を用いた制振システムの研究が多方面で活発に実施されている。本研究では座屈拘束丸鋼ダンパーに着目し、方杖ブレースへの適用や心棒架構への適用、さらには新形式の座屈拘束ブレースへの適用を検討した。いずれも新しいコンセプトに基づいており設計法を整備するなど学術的意義が高い。地震に強い都市を構築していく上で有効な技術であり社会的な意義も高い研究成果である。