Seismic Performance of Rocking Frames with Column Mid-height Uplift Mechanism at the First Story

2015 Fiscal Year Final Research Report

• Project/Area Number: 25289177
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Building structures/Materials
• Research Institution: Hokkaido University
• Principal Investigator: Midorikawa Mitsumasa 北海道大学, 工学(系)研究科(研究院), 特任教授 (90126285)
• Co-Investigator(Kenkyū-buntansha): ASARI Tetsuhiro 北海道大学, 大学院工学研究院, 助教 (90250472)
• Co-Investigator(Renkei-kenkyūsha): AZUHATA Tatsuya 国立研究開発法人建築研究所, 国際地震工学センター, 上席研究員 (00251629) ; ISHIHARA Tadashi 国立研究開発法人建築研究所, 建築生産研究グループ, 主任研究員 (50370747) ; OKAZAKI Taichiro 北海道大学, 大学院工学研究院, 准教授 (20414964)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 建築構造 / 制振 / ロッキング / 地震応答低減 / 耐震設計

Outline of Final Research Achievements

The steel frames with column mid-height uplift (CMU) mechanism at the first story are implemented as response-control structural systems that reduce the seismic effects by exploiting the gravity effect generally deteriorating the seismic performance of ordinary structures. In the previous studies, the reduction effect on the seismic response of the column-base uplift (CBU) rocking systems with columns allowed to uplift has been evaluated and examined. The advantages and disadvantages of the systems have also been discussed. This study presents the seismic performance of CMU rocking frames with emphasis on the fundamental mechanical properties of CMU frames based on the simplified analytical models, performance evaluation of CMU mechanism resulted from the cyclically static loading tests and the seismic response behavior of CMU frames. Finally, some suggestions and recommendations are made on the seismic design of the rocking systems.

Free Research Field

建築耐震構造、鋼構造、建築振動