小半径单箱双室曲线桥梁翼缘有效宽度的研究  

Analysis of effective flange width of small radius curved bridge with single box and double chamber

作　　者：方飞[1] 张杰 张鲲[3] 张振[1] 方诗圣[1,3] 

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]安徽省蚌埠市县乡公路管理局,安徽蚌埠233000 [3]安徽省交通规划设计研究院,安徽合肥230088

出　　处：《合肥工业大学学报（自然科学版）》2013年第9期1088-1092,共5页Journal of Hefei University of Technology：Natural Science

基　　金：安徽省交通技术计划资助项目(2008-16)

摘　　要：针对小半径单箱双室曲线梁桥的剪力滞效应以及选取其翼缘有效宽度的问题,文章依托实际工程,采用有限元软件ABAQUS建立某曲线梁桥的空间有限元模型,分析了荷载为重力、汽车荷载等共同作用下结构的变形和内力,研究不同曲率半径下,剪力滞效应及其对小半径曲线梁桥翼缘有效宽度取值的影响。结果表明:对于单箱双室箱形截面,不同半径作用下,中腹板对应的有效宽度都小于两侧宽度;相比直线桥而言,对于不同的曲率半径,内腹板对应的有效宽度大于外侧腹板;随着曲率半径的减小,各个腹板对应的有效宽度的差值也越来越大。故在确定小半径单箱双室曲线梁桥翼缘有效宽度时,可以在现行桥梁设计规范的计算宽度基础上乘以修正系数。The shear lag effect of small radius curved bridge with single box and double chamber and the selection of the effective width of flange were studied. Based on the practical engineering, the de- formation and the inner force of the structure under the interaction of load gravity and vehicle load were analyzed by the spatial finite element model of a curved girder bridge using the finite element software ABAQUS. The shear lag effect of small radius curved bridge with single box and double chamber under different radius of curvature and the influence on the flangers value were studied. The results show that under the influence of different radius, the corresponding effective width of medium web is less than bilateral web width for the section of single box and double chamber single box; com- pared with the straight bridge, the corresponding effective width of medial web is larger than lateral web＇s under different radius of curvature; the differences of the corresponding effective width of each web become larger and larger with the decrease of radius of curvature. In a conclusion, the calculative width of current bridge＇s design specifications should be multiplied by the correction factor to confirm the effective flange width of small radius curved bridge with single box and double chamber.

关 键 词：曲线桥梁 剪力滞效应 有效宽度 有限元 曲率半径 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]