01476914

Component

https://doi.org/10.3141/2360-04

http://scholar.google.com...mhan&publication_year=2013

Numerous steel highway bridges, still in use today, were built during the construction boom between the late 1950s and the late 1970s. Fatigue cracking can be considered a main source of deterioration for these bridges. The largest category of observed fatigue cracks is caused by out-of-plane distortion. The most susceptible locations are those at which transverse structural components (such as diaphragms or cross frames) are framed into longitudinal girders through web stiffeners that are not attached to the flanges. In the current study, a web stiffener detail is fatigue tested under different cyclic loading conditions. As-welded specimens are tested, along with specimens retrofitted by grinding and rewelding, needle peening, or the adhesive bonding of fiber-reinforced polymer attachments. Direct strain and deflection measurements are compared with finite element analysis predictions, and local (hot-spot) stresses are compared with hot-spot stress design curves. A time series–based method for damage detection is also explored for the prediction of fatigue crack depth with strain data. The method is validated through the use of small- and large-scale specimen strain data. It is found that damage measures based on strains in the vicinity of the critical hot spot are closely correlated with the true crack depth.

01500226

13-4720

English

pp 27–35

2013

Transportation Research Record: Journal of the Transportation Research Board

9780309286862

Print

Figures (11) ; Photos; References (17)

Fatigue (Mechanics); Fatigue cracking; Fatigue tests; Fiber reinforced polymers; Field tests; Finite element method; Maintenance; Retrofitting; Steel bridges; Structural deterioration and defects; Structural health monitoring; Web stiffened structures; Welding

Bridges and other structures; Highways; Maintenance and Preservation; I34: Steels and Metals; I61: Equipment and Maintenance Methods

TRIS, TRB, ATRI

Feb 5 2013 12:55PM

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