斜腹板箱形梁桥腹板剪力分布的空间三维有限元分析  

Spatial 3D finite element analysis of web shear force distribution of box-girder bridge with inclined web

作　　者：李政伟 王海君 张海 LI Zheng-wei;WANG Hai-jun;ZHANG Hai(School of Mechanics and Construction Engineering,Jinan University,Guangzhou 510632,China;Guangzhou Transportation Investment Group Co.Ltd.,Guangzhou 510288,China)

机构地区：[1]暨南大学力学与建筑工程学院,广州510632 [2]广州交通投资集团有限公司,广州510288

出　　处：《沈阳工业大学学报》2022年第4期467-472,共6页Journal of Shenyang University of Technology

基　　金：国家重点研发计划项目(2018YFC0809600).

摘　　要：为了研究斜腹板单箱多室箱梁在不同边腹板斜度、边界条件和箱室数量等条件下的腹板剪力分配规律,采用三维有限元分析软件对单箱多室箱梁进行数值模拟,通过后处理“局部方向内力总和”提取出箱梁各道腹板的剪力值并运用剪力增大系数的概念进行对比分析.结果表明:边腹板斜率增大,对剪力分配影响较小;支座数量的增多使得梁端支座反力在腹板中的分布更为均匀,多支座可有效降低边腹板承担剪力的比例;箱室的数量减少,可使剪力分布趋于均匀分布.In order to study the law of web shear force distribution of single-box multi-chamber box-girder with inclined webs under different slopes,boundary conditions and box numbers,a 3D finite element analysis software was used to perform the numerical simulation of single-box multi-chamber box-girder.The post-processing,namely“sum of local internal forces”,was used to extract the shear force values for each web of box-girder,and the concept of shear force increase coefficient was used for comparative analysis.The results show that the increase of side web slope has no significant effect on the shear force distribution,the increasing number of supports makes the reaction force distribution of beam end supports in the web more uniform and multiple supports can effectively reduce the proportion of side web bearing the shear force,while the decrease of chamber number can make the shear force distribution evenly distributed.

关 键 词：单箱多室箱梁 斜腹板 剪力分配 剪力增大系数 局部方向内力总和 抗剪承载力 三维有限元 恒载 

分 类 号：TU997[建筑科学—市政工程]