| Autor: |
Maljaars, J., Pijpers, R.J.M. |
| Jazyk: |
angličtina |
| Rok vydání: |
2013 |
| Předmět: |
|
| Zdroj: |
3rd Orthotropic Bridge Conference Proceedingas, June 26-28, 2013, Sacramento, California, USA, 211-220 |
| Popis: |
A number of orthotropic deck structures of existing bridges are suffering from fatigue cracks. Maintenance of these deck structures may consist of regular inspections and repair of detected cracks. The usual fatigue design life procedure for aswelded structures based on S-N curves is not feasible for determining the remaining fatigue life after inspection, because S-N curves only give information on the entire fatigue life. An assessment procedure dedicated to determine the residual fatigue life is the fatigue fracture mechanics method, which starts from an initial defect and predicts the growth of this defect to a critical size. The initial defect may be a small crack detected during an inspection, or an inspection threshold value in case no crack was detected. This paper provides approximate stress intensity factors (geometric correction factors) for crack locations in continuous stringer to crossbeam joints with cope holes, which forms essential information for a fracture mechanics assessment. The stress intensity factors are based on existing stress intensity factors for semi-elliptical surface flaws, corner flaws, through thickness flaws, non-load carrying welds and load carrying fillet welds. Modifications are provided to account for the finite length of welds and / or for the stress reduction away from the hot-spot. Results of the calculation are compared with fatigue tests results. An example shows a possible application of the method |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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