铁道科学与工程学报2011，Vol.8Issue(1)：14-18,5.
变截面箱梁剪力滞及剪切变形效应近似计算方法
An approximate method to analyze the effect of shear lag and shear deformation of box beam with varying depth
摘要
Abstract
Since the change of bending stiffness along its axid, the finite element method was usually used to analysis box beam with varying depth. Based on the equivalent stiffness and equivalent stiffness ratio method, an approximate method suitable for hand calculation was proposed to calculate the vertical displacement and shear lag coefficient of box beam with varying depth bearing load, in which, the double effects of shear lag and shear deformation can be taken into account. It shows that the vertical displacement calculated by elementary beam theory without considering shear lag effect and the shear deformation is smaller, comparing to results calculated by the approximate method proposed in the paper. For such box beam with varying depth, transverse shear deformation effect is greater than the shear lag effect when calculating the vertical displacement. However, transverse shear deformation has no effect on stress calculation and shear lag coefficient. The approximate method offers a simple and effective calculating method for the design of box beam with varying depth, in which, analysis formula can be applied in engineering practice through simple revision.关键词
箱形梁/剪力滞效应/剪切变形/变截面箱梁Key words
box beam/shear lag effect/shear deformation/box beam with varying depth分类
交通工程引用本文复制引用
丁南宏,林丽霞,钱永久..变截面箱梁剪力滞及剪切变形效应近似计算方法[J].铁道科学与工程学报,2011,8(1):14-18,5.基金项目
甘肃省自然科学基金资助项目(2008GS02604) （2008GS02604）
兰州交通大学"青蓝"基金项目(QL-05-13A) （QL-05-13A）
