Influence of local geometric parameters on fatigue performance of orthotropic steel deck
来源期刊：中南大学学报(英文版)2014年第5期
论文作者：SONG Yong-sheng(宋永生) DING You-liang(丁幼亮)
文章页码：2091 - 2099
Key words：fatigue effect; orthotropic steel deck; local detail; structural health monitoring; finite element analysis; wheel load
Abstract: Fatigue has become critical issue for bridge with orthotropic steel deck. Number of stress cycle and equivalent stress amplitude were adopted as two investigated fatigue effects. As presented from fatigue monitoring comparison of two series-lined bridges, three local geometric parameters of steel box girder have significant influence on fatigue performance of two welded joints. They are thickness of longitudinal ribs (Tr), longitudinal spacing of transverse floor plate (Sc) and longitudinal truss (LT). Fatigue analytical models were created for parametric study of fatigue effects under wheel load. Consequently, three local parameters have exhibited insignificant influence on number of stress cycle. Compared with Tr and Sc, configuration of LT has brought about foremost effect on the equivalent stress amplitude. For equivalent stress amplitude of rib-to-deck and rib-to-rib welded joints, the influence regions of LT are respectively longitudinal strap and quadrate with the geometric length of 600 mm. Enough attention ought to be paid for local stiffen structure on fatigue performance of orthotropic steel deck in fatigue design and monitoring.
SONG Yong-sheng(宋永生), DING You-liang(丁幼亮)
(Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education (Southeast University),
Nanjing 210096, China)
Abstract:Fatigue has become critical issue for bridge with orthotropic steel deck. Number of stress cycle and equivalent stress amplitude were adopted as two investigated fatigue effects. As presented from fatigue monitoring comparison of two series-lined bridges, three local geometric parameters of steel box girder have significant influence on fatigue performance of two welded joints. They are thickness of longitudinal ribs (Tr), longitudinal spacing of transverse floor plate (Sc) and longitudinal truss (LT). Fatigue analytical models were created for parametric study of fatigue effects under wheel load. Consequently, three local parameters have exhibited insignificant influence on number of stress cycle. Compared with Tr and Sc, configuration of LT has brought about foremost effect on the equivalent stress amplitude. For equivalent stress amplitude of rib-to-deck and rib-to-rib welded joints, the influence regions of LT are respectively longitudinal strap and quadrate with the geometric length of 600 mm. Enough attention ought to be paid for local stiffen structure on fatigue performance of orthotropic steel deck in fatigue design and monitoring.
Key words:fatigue effect; orthotropic steel deck; local detail; structural health monitoring; finite element analysis; wheel load
