加劲肋形式对钢箱梁桥面板受力性能的影响

陈红

云南省交通规划设计研究院股份有限公司，云南 昆明  650011

摘要：为分析钢箱梁不同加劲肋形式的桥面板受力情况，采用软件ANSYS对上部结构跨径为（32+40+32）m的单箱双室连续钢箱梁建立整体模型及空间全板壳局部模型，获取主梁体系和桥面体系效应，对比分析常用的开口截面（倒T型）加劲肋和闭口截面（U型）加劲肋桥面板结构效应。结果表明：1）由整体模型得到钢箱梁主梁体系受力情况，基本组合作用和疲劳荷载作用下，倒T型加劲肋和U型加劲肋模型的桥面板位移和所受应力相差不大。2）在车辆局部荷载作用下，倒T型加劲肋桥面板纵、横向应力是U型加劲肋桥面板的2倍多；倒T型加劲肋的最大纵向应力比U型加劲肋大，竖向剪应力比U型加劲肋小，比桥面板小；U型加劲肋钢箱梁横隔板横向及竖向应力比倒T型加劲肋显著增大，最大约3.5倍，设计中应通过调整纵向、横向加劲肋刚度使各构件受力均衡；倒T型加劲肋和U型加劲肋模型的桥面板局部变形趋势相同，倒T型加劲肋模型下桥面板局部变形较U型加劲肋模型大，前者位移约为后者的1.2倍。

关键词：钢结构；钢梁；桥面板；加劲肋；局部应力；桥面板

The impact of stiffener form on the load-bearing performance of steel box girder bridge deck

CHEN Hong

Broadvision Engineering Consultants Co., Ltd., Kunming 650011, China

Abstract: To analyze the stress conditions of bridge deck panels with different stiffener forms in steel box girders, the software ANSYS is used to establish a comprehensive model and a spatial shell local model for a single box double-chamber continuous steel box girder with a span of (32+40+32)m. The effects of the main girder system and bridge deck system are obtained, and a comparative analysis is conducted on the structural effects of commonly used open section (inverted T-shaped) stiffeners and closed section (U-shaped) stiffeners in bridge deck panels. The results indicate that: 1) The overall model reveals that the stress situation of the main girder system in the steel box girder, under basic combination effects and fatigue load effects, shows that the displacements and stresses of the bridge deck panels with inverted T-shaped stiffeners and U-shaped stiffeners are quite similar. 2) Under local vehicle load, the longitudinal and transverse stresses of the inverted T-shaped stiffener bridge deck panel are more than twice those of the U-shaped stiffener bridge deck panel; the maximum longitudinal stress of the inverted T-shaped stiffener is greater than that of the U-shaped stiffener, while the vertical shear stress is smaller than that of the U-shaped stiffener and is lower than that of the bridge deck panel; the transverse and vertical stresses of the U-shaped stiffener steel box girder web are significantly increased compared to the inverted T-shaped stiffener, with a maximum increase of about 3.5 times. In design, adjustments should be made to the stiffness of the longitudinal and transverse stiffeners to ensure balanced stress in all components; the local deformation trends of the bridge deck panels in the inverted T-shaped and U-shaped stiffener models are similar, but the local deformation of the bridge deck panel under the inverted T-shaped stiffener model is larger than that of the U-shaped stiffener model, approximately 1.2 times the displacement of the latter.

Keywords: steel structure; steel beem; bridge deck slab; stiffener; localized stress