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distortion - induced fatigue in MULTI-GIRER STEEL BRIDGES
| 题名： | distortion - induced fatigue in MULTI-GIRER STEEL BRIDGES |
| 作者： | Dmitri Jajich Paul M. Bergson Arturo E. Schultz Theodore V. Galambos |
| 关键词： | bridge girders web-gap fatigue life web-gap stress mechanism web stiffeners connection plates web-gap distortion |
| 摘要： | This report summarizes the findings of a project with the following goals To implement a field instrumentation and monitoring program for a typical multi-girder steel bridge on skew supports that may be susceptible to web-gap distortion; to assess the frequency and magnitude of the distortional fatigue stresses at the web-stiffener connections; and to evaluate the impact of these stresses on fatigue life. Measurements from 12 independent strain gauges were continuously monitored and recorded for more than three months on Minnesota Department of Transportation(Mn/DOT) bridge #27734. Truck loading tests also were conducted. Predicted web-gap fatigue life based on the long-term monitoring data front Mn/DOT bridge #27734 ranges front 45 to 75 Years. Comparison of web-gap stresses with primary design stresses reveals that web distortional stresses are comparatively high. The report also highlights a detailed finite element study to better understand the web-gap stress mechanism and to compare Experimental results with theoretical predictions. Study results have important implications for investigators of distortion- Measured at the strain gauge. The report includes a method for estimation girder deflections and web-gap stress. |
| 报告类型： | 科技报告 |
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