Numerical and experimental investigation of long brace dampers adopted in a novel damping modification systems for super tall buildings in high seismic zones

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K14288
• 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: Tokyo Institute of Technology
• Principal Investigator: Yuki Terazawa 東京工業大学, 環境・社会理工学院, 助教 (10848245)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 超高層 / ダンパー / 座屈拘束ブレース / 最適化 / Damped braced tube / Damped outrigger

Outline of Final Research Achievements

A series of numerical simulation was performed to investigate the required performance of long brace dampers adopted in a novel damping modification system for tall buildings in high seismic zones. Moreover, two ultra low-cycle fatigue fracture evaluation methods (a plastic-hinge-based damage model and a void growth model), which could be adopted in the structural design of long damper braces, were validated by experiments and finite element analysis.

Free Research Field

建築構造

Academic Significance and Societal Importance of the Research Achievements

日本を含め深刻な地震地域で超超高層建物を実現した事例は殆ど無く，適切な地震応答制御手法は確立されていない。軒高さ300mを超える超超高層建物では，架構の曲げ応答が特に卓越し，各階のせん断変形を利用して制振部材に地震エネルギーを吸収させる従来の設計は十分な地震応答低減効果を期待できない。この様に超超高層建物に高い耐震性能を与える地震応答制御手法の開発は社会から求められており，学術的に見て推進すべき重要な研究課題である。本研究は“超超高層建物に適した地震応答制御手法とは何か”を研究課題の核心をなす学術的な「問い」とする。上記の問題に解決策を提示出来れば広く社会・学術へ波及効果を期待できる。