Studies on a design method for fatigue strength of seismic control devices for girder bridges at the ordinary and seismic times

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420469
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Structural engineering/Earthquake engineering/Maintenance management engineering
• Research Institution: Setsunan University
• Principal Investigator: Zui Hiroshi 摂南大学, 理工学部, 教授 (30236062)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 桁橋 / 制震装置 / 桁間衝突 / 低サイクル疲労強度 / 疲労損傷評価 / 桁の温度伸縮

Outline of Final Research Achievements

Fatigue experiments of steel bellows as one of seismic devices for steel girder　bridges were carried out and SN curves were obtained covering a wide range from the low cycle to the very low cycle for deformations due to temperature expansions of girders and L2 earthquakes. SN490 Steel materials with the stipulated upper and lower limit points of yield strength are used aiming manufactures. Fatigue strength is improved by means of residual stress relieving (SR) regarding the conventional Omega shape bellows having a large and two small cylinders. However, the new type U shape bellows consisted only a large cylinder have the same fatigue strength even for wituout SR as the stress relieved Omega shape bellows if the ratio of the radius of the cylinder and thickness is over 5.

Free Research Field

工学 構造工学・地震工学・維持管理工学