单箱多室波形钢腹板箱梁剪力滞研究  

Research on Shear Lag of Single-box Multi-cell Girder with Corrugated Steel Webs

作　　者：陈水生[1] 田正龙 桂水荣[1] 

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013

出　　处：《公路交通科技》2015年第7期69-75,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51268013;51468018);江西省自然科学基金项目(20114BAB216008;20122BAB206004);江西省教育厅科研项目(CJJ14384;GJJ14352)

摘　　要：为客观准确地对单箱多室波形钢腹板PC组合箱梁的剪力滞效应进行评价,结合单箱多室混凝土箱梁的计算特点,定义了波形钢腹板箱梁的剪滞翘曲位移函数,通过能量变分法建立了单箱双室和单箱三室波形钢腹板箱梁考虑剪力滞效应的基本微分方程。分别采用有限元方法和解析方法分析计算了范例的剪力滞效应,研究了跨中集中荷载和满跨均布载荷作用下截面的剪力滞分布规律,探讨了跨宽比对剪力滞效应的影响。研究表明,该解析解与有限元数值解吻合较好,但在箱梁顶底板与波形钢腹板接合处、外伸悬臂板边缘处有一些差异,需要进行修正。研究给出了相关的剪力滞系数,可以为波形钢腹板箱梁设计时的剪力滞系数取值提供参考。To evaluate the shear lag effect of PC composite box girder with corrugated steel webs objectively and accurately, combining with the calculation characteristics of single-box multi-cell concrete box girder, the shear lag warping displacement function of box girder with corrugated steel webs is defined. By energy variational method, the basic differential equations of single-box twin-cell and triple-cell box girders with corrugated steel webs are established considering the effect of shear lag. An example is analysed by using both of FEM and presented method to study the sectional distribution of shear lag under mid-span concentrated load and full-span uniformly distributed load respectively, then the effect of span-width ratio on the shear lag is also discussed. The research result shows that the FEM solution and analytical solution are in good agreement, but there are some differences in the junctions of roof and floor of box girder with corrugated steel webs and overhanging edge of the cantilever plate, which need to be revised. The corresponding shear lag coefficient is presented in the study which can be a designing box girder with corrugated steel webs.

关 键 词：桥梁工程 多室箱梁 能量变分法 剪力滞 波形钢腹板 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]