[1]张玉元,张元海,张慧.梁端约束条件对箱形梁剪力滞效应的影响[J].东南大学学报(自然科学版),2018,48(4):671-677.[doi:10.3969/j.issn.1001-0505.2018.04.012]
 Zhang Yuyuan,Zhang Yuanhai,Zhang Hui.Influence of end restraint condition on shear lag effect of box girder[J].Journal of Southeast University (Natural Science Edition),2018,48(4):671-677.[doi:10.3969/j.issn.1001-0505.2018.04.012]
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梁端约束条件对箱形梁剪力滞效应的影响()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
48
期数:
2018年第4期
页码:
671-677
栏目:
交通运输工程
出版日期:
2018-07-20

文章信息/Info

Title:
Influence of end restraint condition on shear lag effect of box girder
作者:
张玉元张元海张慧
兰州交通大学土木工程学院, 兰州 730070
Author(s):
Zhang Yuyuan Zhang Yuanhai Zhang Hui
School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
关键词:
薄壁箱梁 剪力滞翘曲 梁端约束条件 能量变分法 附加挠度 剪力滞系数
Keywords:
thin walled box girder shear lag warping end restraint condition energy variation method additional deflection shear lag coefficient
分类号:
U448.213
DOI:
10.3969/j.issn.1001-0505.2018.04.012
摘要:
为了揭示梁端约束条件对箱形梁剪力滞效应的影响,选取剪力滞效应引起的附加挠度为广义位移,在箱形梁横截面上引入3个翘曲位移修正系数,运用能量变分法建立了关于附加挠度的控制微分方程及边界条件,导出了均布荷载作用下相应于不同梁端约束条件的箱形梁剪力滞系数和附加挠度解析解.结合数值算例,详细分析了梁端约束条件对剪力滞系数和附加挠度的影响.研究结果表明:该研究计算结果与有限元计算结果吻合良好;梁端约束程度越强,剪力滞系数横、纵向分布曲线越陡峭,剪力滞附加挠度纵向分布曲线越平缓;正、负弯矩区的剪力滞系数纵向分布规律与相应的简支箱梁和悬臂箱梁类似;与简支箱梁相比,一端固定另一端简支的箱梁和两端固定的箱梁跨中截面顶板与腹板交汇处的剪力滞系数分别增大了12.86%和25.63%,跨中截面的剪力滞附加挠度分别减小了13.79%和25.60%.
Abstract:
In order to reveal the influence of end restraint condition on the shear lag effect of box girder, the additional deflection induced by shear lag effect was chosen as a generalized displacement. Three modification factors of the shear lag warping displacement were introduced for the cross section. The governing differential equation and the corresponding boundary condition were established by applying the energy variation method. The analytical solution to the additional deflection and shear lag coefficient for different end restraint conditions were derived under the uniform force. Combined with numerical examples, the influence of end restraint condition on the additional deflection and shear lag coefficient was analyzed in detail. Numerical examples show that the calculation results in the present method are in a good agreement with those by the finite element method. The stronger the end restraint condition, the steeper the shear lag coefficient distribution curve, but the longitudinal distribution curve of additional deflection is more flat. The longitudinal distribution of shear lag coefficient of the positive and negative moment areas is similar to that of the simple supported and cantilever box girder. Compared with the simply supported box girder, the shear lag coefficients of the one end fixed and the other end simply supported and the fixed-ends box girder are increased by 12.86% and 25.63% at the intersection of upper wing flanges and webs with mid-span section, respectively. The additional deflections at the mid-span section are decreased by 13.79% and 25.60%, respectively.

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相似文献/References:

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备注/Memo

备注/Memo:
收稿日期: 2018-01-10.
作者简介: 张玉元(1989—),男,博士生; 张元海(联系人),男,博士,教授,博士生导师,zyh17012@163.com.
基金项目: 国家自然科学基金资助项目(51508255, 51468032, 51268029)、兰州交通大学青年基金资助项目(2018017)、2017年度陇原青年创新创业人才资助项目.
引用本文: 张玉元,张元海,张慧.梁端约束条件对箱形梁剪力滞效应的影响[J].东南大学学报(自然科学版),2018,48(4):671-677. DOI:10.3969/j.issn.1001-0505.2018.04.012.
更新日期/Last Update: 2018-07-20