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Title |
Local Behavior of Structural Details for Orthotropic Steel Deck Bridge with Longitudinal Rib of Open Section and Retrofitting Method of Fatigue Cracks
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Keywords |
강바닥판 ; 강교량 ; 개단면 세로리브 ; 리브 용접부 ; 피로균열 ; Orthotropic steel deck ; Steel bridge ; Longitudinal rib with open section ; Welded joint of rib ; Fatigue crack |
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Abstract |
Although many studies have been performed for the structural details of orthotropic steel deck, most of them were focused on the trough rib of standard type, but not for orthotropic steel deck with longitudinal rib of open section used at beginning of the deck. In order to investigate the cause of fatigue crack for orthotropic steel deck bridge serviced 31 years with longitudinal rib of open section, in this study, the behavior characteristics of target structural details were analyzed based on measurement data under real traffic condition. Also the typical loading truck passing the target bridges was estimated with the structural analysis detailed, and the stresses and deformation patterns of target structural details were analyzed by performing the detailed structural analysis. Based upon the analysis, retrofitting methods of the fatigue crack were suggested and its validation was examined. From this study, it was clarified that fatigue crack of longitudinal rib with open section were affected with the stress increment by shear deformation in the rib and the occurrence of alternative stress due to moving vehicle. In addition, it was known that it is important to perform fatigue design reflected the local behavior of the structural details.
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