连续钢板组合梁力学性能研究  

Study of Mechanical Performance of Continuous Steel Plate-Concrete Composite Beam Bridge

作　　者：郭一枝 贺耀北 焉学永 刘榕 GUO Yi-zhi;HE Yao-bei;YAN Xue-yong;LIU Rong(Hunan Changyi Highway Expansion Project Construction Development Co. , Ltd. , Changsha 410001, China;Hunan Provincial Communications Planning, Survey & Design Institute Co. , Ltd. , Changsha 410200, China)

机构地区：[1]湖南省长益高速公路扩容工程建设开发有限公司,湖南长沙410001 [2]湖南省交通勘察规划设计院有限公司,湖南长沙410200

出　　处：《世界桥梁》2019年第4期58-63,共6页World Bridges

摘　　要：为了解连续钢板组合梁力学性能特点,并改善其负弯矩区易开裂的状况,以长沙至益阳段高速公路扩容工程4×30m连续钢板组合梁桥为背景,采用ANSYS软件建立组合梁有限元模型,分析组合梁结构施工过程及成桥阶段的应力分布,研究支点负弯矩区桥面板裂缝控制措施。结果表明,施工阶段简支状态下,连续钢板组合梁混凝土桥面板基本处于受压状态,钢梁跨中最大VonMises应力约为70.5MPa,翼缘焊钉顺桥向剪力从跨中向两侧支点逐渐增加,最大值12kN;汽车活载作用下,墩顶处混凝土桥面板顺桥向最大拉应力为2.9MPa,钢梁最大VonMises应力约为64.6MPa,焊钉顺桥向剪力峰值约为22kN。采用调整施工顺序、墩顶区现浇微膨胀纤维混凝土、加强负弯矩区纵筋配置等措施有效调整了结构应力分布,减小负弯矩区的裂缝宽度。To examine the mechanical performance of the continuous steel plate-concrete composite beam and reduce cracking in the hogging moment regions of the beam of such type, the 4×30 m continuous steel plate-concrete composite beam bridge of the expansion project of the Changsha-Yiyang Highway was taken as the study background. The software ANSYS was used to establish the finite element model of the composite beam, to analyze the stress distribution condition of the composite beams during the construction process and in the completed bridge state and study the cracking control measures for the hogging moment regions at the supports. The results show that the concrete slabs of the continuous steel plate-concrete composite beam are generally in the compressive condition during the construction process, when the structure stays in the simply-supported condition. The maximum Von Mises stress in the midspan of the steel beam is about 70.5 MPa, the shear forces in the welding studs in the flanges along the bridge length become bigger and bigger from the midspan towards the two end supports, with a maximum value of 12 kN. Under the live loads of vehicles, the maximum tensile stress in the concrete slabs at the pier tops along the bridge length is 2.9 MPa, the maximum Von Mises stress in the steel beam is about 64.6 MPa, and the peak shear force in the steel studs along the bridge length is about 22 kN. Measures are taken to effectively adjust the distribution of structural stresses and reduce the widths of cracks in the hogging moment regions, including making changes to the construction sequence, casting fiber-reinforced micro-expansion concrete to the pier-top regions and improving the layout of longitudinal reinforcement in the hogging moment regions.

关 键 词：连续钢板组合梁 工字型钢梁 混凝土桥面板 先简支后连续 受力性能 负弯矩区 裂缝宽度 有限元法 

分 类 号：U448.216[建筑科学—桥梁与隧道工程] U441.5[交通运输工程—道路与铁道工程]