Development of Steel/Concrete Composite Structural Columns for Metabolism of Seismic Performance

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K22431
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0303:Civil engineering, social systems engineering, safety engineering, disaster prevention engineering, and related fields
• Research Institution: Kyoto University
• Principal Investigator: Uemura Keita 京都大学, 工学研究科, 助教 (80882133)
• Project Period (FY): 2020-09-11 – 2022-03-31
• Keywords: 柱構造 / 複合構造 / 鋼構造 / メタボリズム / セルフセンタリング / 取り替え / 復旧性

Outline of Final Research Achievements

In this study, we proposed a composite column structure in which a replaceable steel pipe is used in the outer shell for energy absorption during an earthquake, and a member with a vertical force support function and self-centering function is used for the center core of the column.
Specifically, a column structure using steel pipe in the outer shell and rubber bearings at the bottom of the center core was studied. The experimental and analytical investigations showed that this column structure has excellent deformation capacity compared with a conventional steel pier and that it is possible to modify the seismic performance of the columns by replacing the steel pipe in the outer shell according to revisions of seismic design codes and the damage in earthquakes. In addition, the use of self-centering members in the central core of the columns shows the possibility of realizing a structure that can be restored quickly after earthquakes.

Free Research Field

耐震工学

Academic Significance and Societal Importance of the Research Achievements

我が国の耐震設計は，大地震発生のたびに基準が改訂されており，耐震設計が地震に対して「後追い」であるといえる．事実，多くの土木構造物が，耐震基準改定によって既存不適格な構造物となってしまい，後付けの耐震補強を余儀なくされるケースが見受けられる．
本研究で提案した構造に適用された，部材の取り替えを想定するという考え方は，ダンパーをはじめとする免制振部材では一般的であるが，橋脚の部材を取り替える技術開発例は極めて少ない．部材の取り替えによる耐震性能の新陳代謝が可能な本提案構造における考え方は，将来の地震に先手を打つことに繋がり，耐震工学における新たなアプローチとなりえる．