摘要
针对于公路桥梁箱梁悬臂的施工过程中,利用ANSYS有限元软件,就预应力作用对箱梁悬臂剪力滞效应的影响进行了研究。结果表明,预应力施加之后顶板的剪力还有滞系数的数值大概在1左右,同时还将剪力的滞效应减小了,在距离固端近的A截面,剪力滞效应有更大的减小。截面的剪力滞系数之所以减少,是因为施加了预应力,再进行了施加之后滞效应明显的减少了。同时翼缘板的刚度会由于横向预应力的施加而增大刚度,使得在界面上顶板的受力是比较均匀的,相对来说结构也是比较安全的。在整个悬臂的施工过程当中,为了能够使得受力不均的现象得到减少要使得横向的预应力不断的张拉,悬臂施工安全性更高。通过竖向预应力的作用,使腹板的刚度得到增加,而对顶板剪力滞变化影响较小。
In this paper , the influence of prestress on the shear lag effect of the box girder isstudied by using the finite element software ANSYS. The results show that the shear lag coefficient of thecross section is close to 1 , and the shear lag effect is reduced when the prestressing force is applied. Theshear lag effect should be reduced in the A section near the fixed end. After the prestress is applied , the shear lag coefficient of the cross - section decreases and the shear lag effect decreases obviously. Trans-verse Prestress , increasing the stiffness of the flange , the cross section of roof stress is relatively uniform , reducing the roof deformation ability , structure safety. In the process of cantilever construction , the transverse prestressing tendons should be tensioned in time , so that the reduced and the safety of the cantilever construction is higher. Through the effect the stiffness of the web is increased , but the influence of the vertical shear lag is smaller.
出处
《公路工程》
北大核心
2017年第5期211-216,共6页
Highway Engineering
基金
江苏省教育科学"十三五"规划2016年度课题(B-b/2016/03/16)
关键词
剪力滞
箱梁悬臂
预应力
刚度
shear lag
box girder cantilever
prestress
stiffness
作者简介
马庆华（1972-）,男,安徽淮北人,副教授,硕士,主要从事结构工程、工程地质、工程施工与管理等领域的教学及科研工作.
