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Field Instrumentation and Analysis of the Arkansas River Bridge. Final rept. February 1998-September 2003.
| 题名： | Field Instrumentation and Analysis of the Arkansas River Bridge. Final rept. February 1998-September 2003. |
| 作者： | haris, k. ramirez, g. roddis, w. m. |
| 关键词： | *Kansas-; *Highway-bridges; *Retrofitting-; *Cracking-Fracturing; *Fatigue-Materials.;Instrumentation-; Service-life; Strain-gages; Field-tests; Installation-. |
| 摘要： | A field instrumentation analysis has been performed on the Arkansas River Bridge, (KDOT Bridge No. 96-78-19.11(064)). The testing was performed before and after retrofit on the exterior girder to floorbeam connections. Before retrofit, the measured stresses match the computational ANSYS results at the stiffener plate. Fatigue life calculations for the retrofitted detail indicated a time range to crack initiation of 25 to 65 years. Calculated fatigue lives are inherently uncertain due to variability in measured stresses, traffic forecast, and construction details. Because the inspected and repaired cracks had not propagated into the web of the main beams before the retrofit it is reasonable to conclude that when a fatigue crack reinitiates stable crack growth will remain in the stiffener. This retrofit of softening the connections was successful, both in repairing existing cracks which were growing in the heat-affected zone of the welds and in softening the connection to mitigate the out-of-plane distortion driven strain-induced fatigue. |
| 报告类型： | 科技报告 |
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