文档介绍：Physical Research Report No. 108
Effects of Corrosion
and Fatigue on the
Load-Carrying Capacity
of Structural and
Reinforcing Steel
IllinoisDepartment of Transportation
@ Bureau of Materials and Physical Research
NICAL REPORT STANDARD TITLE PAGE
1. R-port No. 2. Gowommmt Acc8ssIonNO. 3. RocBPIwt’ a Ca?oieg No.
FHWA/IL/PR- 108
4. Titlg end SubtI?lo
Effects of Corrosion and Fatigue on the Load Carrying
Capacity of Structural and Reinforcing Steel 6. mwxet,en Codo
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7. ******@heds) 8. Porformtn9 Oc~ontxat,en Report No.
Christopher Hahin
9. Porfe,mtn~ Org~, gat,en Nom. md Addrost ]0. Work Unst No.
Illinois Department of Transportation HR-25–317-94-1
Bureau of Materials and Physical Research Or GCOIVNO.
126 East Ash Street
Springfield, Illinois 62704 !&. ef Ropert and Pertod
12. ~SW,”S A90ncy Nemo and Add-*- Final Report:
Illinois Department of Transportation July 1991 - February 1994
Bureau of Materials and Physical Research, in cooperationn
with the U. S. Department of Transportation, 14. Sponsor, mg Avoncy Coda
Federal Highway Administration
15. No*o3
] 16. Abstroct
Pitting and crevice corrosion have profound effects on the
fatigue life of structural and reinforcing steels used in br dge
construction. Stress concentration factors were measured on
actual corroded plates with strain gage instrumentation. us” ng
corrosion rates and pitting ratios fo; immersion, intermittent
immersion and various atmospheric environments from the
corrosion literature, a unified equation for corrosion fatigue
of structural steels, N = C/kf[Scorrlm is proposed to
determine the number of stress cycles to significant crack
formation. The coefficients C, kf and m were determined in
this investigation. Collected strain data is used to construct
a stress–frequency histogram for a bridge, which establishes an
accurate and rapid assessment of traffic damage. The linear
damage rule is