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Fatigue Prone Steel Bridge Details: Investigation and Recommended Repairs. Final rept. January 1999-June 2003.
| 题名： | Fatigue Prone Steel Bridge Details: Investigation and Recommended Repairs. Final rept. January 1999-June 2003. |
| 作者： | zhao, y. roddis, w. m. |
| 关键词： | *Steel-bridges; *Cracking-Fracturing; *Fatigue-Materials; *Case-studies; *Retrofitting-.;Maintenance-; Welded-joints; Finite-element-method; Girders-; Service-life; Kansas-. |
| 摘要： | Development of fatigue cracking has led to severe structural deficiency in many of the Kansas Department of Transportations (KDOT) welded steel bridges. In most circumstances, cracks were found to have developed at the connections of transverse structural members and longitudinal girders due to out-of-plane distortion. Procedures for determination of secondary stresses are not addressed by the current bridge design or rating specifications, since the details subjected to distortion-induced fatigue are often confined to highly localized regions and their corresponding stress fields are difficult to predict using conventional design or analysis approaches. This study presents the application of finite element methods for evaluation of out-of-plane fatigue behavior and recommendation of appropriate retrofit. Through proper modeling of the interaction between longitudinal girders and transverse structural members, causes of distortion-induced cracking were determined and different repair options were assessed. The central focus of the research is the case studies of five KDOT bridges with typical superstructure types and cracking scenarios. To link the global structural behavior under truck loading to the local stress concentration of crack prone details, a two-level finite element modeling approach was employed during the investigations. Both modeling procedures successfully determined the stress magnitude and distribution caused by out-of-plane distortion, and at the same time minimized the computation effort as well. |
| 报告类型： | 科技报告 |
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