非对称荷载作用下简支箱梁畸变应力计算  

The Calculation of Distortion Stress of Simply-supported Box Girder under Asymmetric Load

作　　者：王晨阳 WANG Chenyang(CCCC Highway Consultants Co.,Ltd.,Beijing 100010,China)

机构地区：[1]中交公路规划设计院有限公司,北京100010

出　　处：《工程技术研究》2024年第23期1-4,14,共5页Engineering and Technological Research

摘　　要：文章通过计算箱形梁框架畸变应变能、畸变翘曲应变能和外荷载势能,得到了箱形梁总势能,采用欧拉-拉格朗日条件,建立了箱形梁畸变控制微分方程,并通过边界条件计算了简支箱梁的畸变应力。采用ANSYS有限元软件中的SHELL63单元建立了箱梁的有限元模型,对比了箱形梁的畸变翘曲应力有限元计算结果与解析法计算结果,在此基础上,进一步分析了畸变广义内力的分布规律。研究结果表明,采用文章推导得到的畸变控制微分方程计算所得简支箱梁畸变翘曲应力与ANSYS有限元结果良好吻合,验证了文章方法的正确性。The total potential energy of box girder is obtained by calculating the distortion strain energy,distortion warping strain energy and external load potential energy of box girder frame.The distortion control differential equation of box girder is established by using Euler-Lagrange condition,and the distortion stress of simply-supported box girder is calculated by boundary conditions.The finite element model of box girder is established by using SHELL63 unit in ANSYS finite element software,the finite element calculation results of distortion warping stress of box girder are compared with those of analytical method,and the distribution law of distortion generalized internal force is further analyzed on this basis.The results show that the distortion warping stress of simply-supported box girder calculated by the distortion control differential equation derived in this paper is in good agreement with the ANSYS finite element results,which verifies the correctness of the method in this paper.

关 键 词：箱形梁 畸变效应 非对称荷载 畸变广义内力 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]