首页 | 本学科首页   官方微博 | 高级检索  
     

一种考虑剪滞效应的斜支承连续箱梁挠曲扭转分析方法
引用本文:张元海, 林丽霞. 一种考虑剪滞效应的斜支承连续箱梁挠曲扭转分析方法[J]. 工程力学, 2012, 29(2): 94-100.
作者姓名:张元海  林丽霞
作者单位:兰州交通大学土木工程学院, 甘肃, 兰州 730070
基金项目:国家自然科学基金项目(51068018);甘肃省高等学校研究生导师科研项目(0804-09)
摘    要:通过在支承坐标系下考虑约束条件,提出一种适用于斜支承连续箱梁挠曲扭转分析的薄壁箱梁单元。该单元具有10 个自由度,可方便地考虑斜支承连续箱梁的剪滞效应和扭翘变形。选取挠曲剪滞微分方程和约束扭转微分方程的齐次解作为单元位移函数,推导出单元刚度矩阵各元素的具体表达式。从剪滞翘曲应力的轴向平衡条件出发,建立双室箱形断面的剪滞翘曲位移函数,并给出了剪滞翘曲几何特性的一般计算公式。用所编制的电算程序SSCBA 对一个3 跨斜支承双室连续箱梁模型进行计算,计算值与实测值和ANSYS 壳单元结果均吻合较好,证实该箱梁单元是可靠的。计算表明:在跨中偏心荷载作用下,斜支承连续箱梁的剪滞翘曲变形和约束扭转翘曲变形对应力分布具有显著影响。

关 键 词:薄壁箱梁  斜支承  剪滞效应  约束扭转  有限段法
收稿时间:2010-04-01
修稿时间:2010-10-20

A METHOD CONSIDERING SHEAR LAG EFFECT FOR FLEXURAL-TORSIONAL ANALYSIS OF SKEWLY SUPPORTED CONTINUOUS BOX GIRDER
ZHANG Yuan-hai, LIN Li-xia. A METHOD CONSIDERING SHEAR LAG EFFECT FOR FLEXURAL-TORSIONAL ANALYSIS OF SKEWLY SUPPORTED CONTINUOUS BOX GIRDER[J]. Engineering Mechanics, 2012, 29(2): 94-100.
Authors:ZHANG Yuan-hai  LIN Li-xia
Affiliation:School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China
Abstract:An element for thin-walled box beams is proposed for the flexural-torsional analysis of skewly supported continuous box girder considering the constraint condition in the supporting coordinate system.The element has ten degrees of freedom and can conveniently simulate shear lag effect and torsional-warping deformation of skewly supported continuous box girder.The element stiffness matrix is derived by taking the homogeneous solutions of the governing differential equations for flexural shear lag and restraint torsion as the element displacement functions.The shear lag warping displacement function for the twin-cell box section is established through the axial equilibrium condition of the shear lag warping stress.General formulas for the geometrical properties of cross section concerning the shear lag warping are presented.The program SSCBA is developed and used to analyze a skewly supported three-span continuous box girder model with twin-cell cross section.The calculated results are in good agreement with the experimental results and the calculated results from shell element of ANSYS.It is shown that the warping deformations of shear lag and restraint torsion affect remarkably the stress distribution in a skewly supported continuous box girder under eccentric load at the mid-span.
Keywords:thin-walled box girder  skew support  shear lag effect  restraint torsion  finite segment method
本文献已被 CNKI 等数据库收录!
点击此处可从《工程力学》浏览原始摘要信息
点击此处可从《工程力学》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号