2010 Fiscal Year Final Research Report

Study on corrosion mechanism and residual strength of high strength bolted connection

Research Project

Project/Area Number	21760357
Research Category	Grant-in-Aid for Young Scientists (B)
Allocation Type	Single-year Grants
Research Field	Structural engineering/Earthquake engineering/Maintenance management engineering
Research Institution	Kyoto University
Principal Investigator	HASHIMOTO Kunitaro Kyoto University, 大学院・工学研究科, 助教 (40467452)
Project Period (FY)	2009 – 2010
Keywords	高力ボルト摩擦接合 / 腐食 / すべり係数 / 残存耐力
Research Abstract	In this research, to clarify corrosion mechanism of high strength bolted joints and residual strength of the joints damaged by corrosion, corrosion accelerating experiment and slip experiment were carried out. From the tests, it is found that though inner surfaces of the connection are almost corroded, shafts of bolts and near holes of the inner surface are few corroded, and slip strength of the joints are increased due to generation of rust over the inner surfaces, but tensile and yielding strength of the joints are decreased because plate thickness and width are decreased.