箱梁桥大悬臂桥面板有限元分析  

Finite Element Analysis of Large Cantilever Deck of Box Girder Bridge

作　　者：刘小冬 LIU Xiao-dong(Hubei Urban Construction Design Institute Co.,Ltd.,Wuhan 430051,China)

机构地区：[1]湖北省城建设计院股份有限公司,湖北武汉430051

出　　处：《中国市政工程》2022年第5期28-30,33,119,120,共6页China Municipal Engineering

摘　　要：悬臂板车轮荷载有效分布宽度的计算中,JTG 3362—2018《公路钢筋混凝土及预应力混凝土桥涵设计规范》第4.2.5条仅适用于悬臂板l_(c)≤2.5 m;而l_(c)>2.5 m时,第4.2.5条规定采用沙柯公式计算悬臂根部单位宽度弯矩,计算不能直接用于有限元软件进行分析。结合工程实例提出了一种解决方案,即利用沙柯公式计算的弯矩,对有效分布宽度进行修正,并确定车载系数,再代入桥博V4对箱梁桥大悬臂桥面板进行计算,结果可靠。希望对类似工程有一定的借鉴意义。In the calculation of effective distribution width of wheel load on cantilever slab,the Article 4.2.5 of JTG 3362—2018 Code for Design of Highway Reinforced&Prestressed Concrete Bridges&Culverts only applies to cantilever slab l_(c)≤2.5 m.When l_(c)>2.5 m,the Article 4.2.5 stipulates that the bending moment per unit width at the root of the cantilever shall be calculated by using the Sawko formula,and the calculation cannot be directly used for finite element software analysis.In combination with the engineering example,a solution is proposed.The effective distribution width is modified by using the bending moment calculated by the Sawko formula,and the vehicle coefficient is determined.Then,the large cantilever deck of the box girder bridge is calculated by substituting it into the Qiaobo V4 software,and the results are reliable,which may be used for reference in similar projects.

关 键 词：箱梁桥 大悬臂 有效分布宽度 沙柯公式 有限元分析 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]