斜交角对斜支承连续箱梁应力影响的研究  

Influence of Skew Angle on Stress of Skewly Supported Continuous Box Girder

作　　者：苏燕东[1] 李琳[1] 白昕[1] 张元海[1] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《兰州交通大学学报》2013年第3期8-11,共4页Journal of Lanzhou Jiaotong University

基　　金：国家自然科学基金(51068018;51268029)

摘　　要：利用ANSYS软件中的SHELL63壳单元对斜支承三跨连续双室箱梁建立有限元分析模型,分别计算对称荷载和偏心荷载作用下斜支承三跨连续箱梁中跨跨中截面和斜支承截面的正应力.通过分析不同斜交角条件下该截面Ⅱ的正应力沿顶、底板宽度的分布特点,揭示斜交角的变化对斜支承连续箱梁应力分布的影响规律.研究结果表明:无论对称荷载还是偏心荷载作用下,横截面正应力均随斜交角的增大而减小,但应力减小的幅度却随斜交角的增大而增大;与对称荷载作用时相比,在偏心荷载作用下,斜支承截面的正应力沿板宽的变化幅度更大.The finite element analysis model for a skewly supported three-span continuous box girder is es- tablished by using the SHELL63 element in software ANSYS. The normal stresses at midspan and skew- support sections are calculated under symmetrical load and eccentric load, respectively. By investigating the normal stress distribution in the top and bottom plates for different skew angles, the influence of skew an- gle on the stress distribution is revealed. It is shown that, regardless of symmetric load or eccentric load, the cross-section stress decreases with the increase of skew angle, however, the reduction amplitude increases with the increase of skew angle^the variation of stress along the plate breath at the skew-supported section is more remarkable under eccentric load compared with symmetric load.

关 键 词：斜支承连续箱梁 双室箱梁 有限元分析 斜交角 应力分布 

分 类 号：U448.213[建筑科学—桥梁与隧道工程] U448.41[交通运输工程—道路与铁道工程]