Kou kouzou rombunshuu
Online ISSN : 1884-0329
Print ISSN : 1880-9928
ISSN-L : 1880-9928
Examination of repair effect of fatigue crack occurs in the base of overhead sign structures
Satoshi YAMADAHideki KATAGIRIHirofumi MAENOKentaro YAMADA
Author information
JOURNALS FREE ACCESS

2009 Volume 16 Issue 61 Pages 61_11-61_22

Details
Abstract

Fatigue cracks were observed recently in lighting poles or overhead sign structures installed on elevated highway bridges. The fatigue cracks normally occurred at weld toes of ribs, which stiffen joints between base plate and tubular section. The fatigue cracks that occurred in actual structures were once repaired by two methods. One was to glue carbon fiber reinforced polymer (CFRP) sheets on and the other was to weld additional ribs for reinforcement. The structures were removed after two years, and the fatigue cracks were inspected to evaluate the effectiveness of the two retrofit measures. Then, static and fatigue tests were carried out on these structures to observe fatigue crack propagation life and to compare those without retrofit measure. Reduction of stress due to the retrofit measures was further confirmed by FEM stress analysis.

Information related to the author
© 2009 Japanese Society of Steel Construction
Previous article Next article
feedback
Top