基于三维有限元的箱梁腹板剪力分配规律分析

Distribution law analysis of shear force in box-girder webs based on 3D finite element

针对单箱多室箱梁在不同支承条件、腹板数量以及腹板厚度条件下的腹板剪力分配规律问题,提出了采用Midas/FEA对单箱多室箱梁进行数值模拟的方法,提取箱梁各道腹板的剪力值并进行对比分析,得到单箱多室箱梁各道腹板所分担剪力并非均分的结果.分析结果表明:当支承条件为双支座时,剪力增大系数最大;当腹板较少时,边腹板与中腹板剪力增大系数差别较小,边腹板的剪力增大系数随腹板数量增加而增大;腹板厚度变化对剪力分配影响不大.

Aiming at the distribution law problem of shear force in the webs of single-box multi-chamber box-girder under different supporting conditions as well as different number and thickness of webs,a method for the numerical simulation of single-box multi-chamber box-girder was proposed with Midas/FEA.The shear value in each web of box-girder was extracted and compared.The obtained results show that the shear force suffered by each web of single-box multi-chamber box-girder is not equal.The analysis results show that when the supporting condition is double bearings,the increasing coefficient of shear force is the largest.When the webs numbers are relatively lower,the difference of increasing coefficient of shear force between the side and middle-webs is smaller,and the increasing coefficient of shear force of side webs increases with the increasing number of webs.The thickness of webs has less effect on the distribution of shear force.