SEISMIC REINFORCEMENT OF EXISTING CYLINDRICAL STEEL PIERS BY TAKING ADVANTAGE OF CONTACT EFFECT OF ADDED STIFFENERS

Research Project

Project/Area Number	20560455
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Structural engineering/Earthquake engineering/Maintenance management engineering
Research Institution	Toyota National College of Technology
Principal Investigator	CHU Kazuo Toyota National College of Technology, 環境都市工学科, 教授 (20141898)
Research Collaborator	KAWANISI Naoki 豊田工業高等専門学校, 環境都市工学科, 准教授 (60300589)
Project Period (FY)	2008 – 2010
Project Status	Completed (Fiscal Year 2010)
Budget Amount *help	¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000) Fiscal Year 2010: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000) Fiscal Year 2009: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000) Fiscal Year 2008: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Keywords	耐震構造 / 制振 / 耐震 / 地震荷重 / 円筒 / 鋼製橋脚 / 繰り返し荷重 / 補強 / 制震 / 繰り返し載荷
Research Abstract	In order to seismically strengthen existing bridge piers, it is commonly required to improve only their ductility while suppressing any excessive strengthening of load bearing capacity. In the present study, we proposed and verified a new method, which is, unlike the conventional method of providing longitudinal stiffeners, the same stiffeners are provided to existing cylindrical steel piers while elaborately allowing a slight gap in between the bottom of a stiffener and bottom plate of a pier. The estimated seismic effect has been verified by an experiment and the numerical analysis. Our studies showed that only the ductility has been effectively increased by being contacted the bottom of stiffeners and the bottom plate of piers after seismic force has reached a maximum level.