[1]张玉元,张元海,张慧.基于换算剪力的变截面箱梁弯曲剪应力计算方法[J].东南大学学报(自然科学版),2021,(1):16-22.[doi:10.3969/j.issn.1001-0505.2021.01.003]
　Zhang Yuyuan,Zhang Yuanhai,Zhang Hui.Calculation method of bending shear stress of variable section box girder based on converted shear force[J].Journal of Southeast University (Natural Science Edition),2021,(1):16-22.[doi:10.3969/j.issn.1001-0505.2021.01.003]
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基于换算剪力的变截面箱梁弯曲剪应力计算方法()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
期数:
2021年第1期
页码:
16-22
栏目:
交通运输工程
出版日期:
2021-01-20

文章信息/Info

Title:
Calculation method of bending shear stress of variable section box girder based on converted shear force
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:
变截面箱梁;  剪应力;  换算剪力;  分项系数;  简化计算方法
Keywords:
variable section box girder;  shear stress;  converted shear force;  partial coefficient;  simplified calculation method
分类号:
U448.213
DOI:
10.3969/j.issn.1001-0505.2021.01.003
摘要:
为了简化变截面箱梁剪应力计算方法,运用梁段微分关系和微元体平衡微分方程建立了变截面箱梁剪应力的传统计算方法.在分析各项剪应力横向分布模式之间相似性的基础上,提出截面换算剪力的概念,并引入剪应力分项系数,建立了变截面箱梁剪应力的简化计算方法.变截面悬臂箱梁算例分析表明:简化计算方法得到的剪应力与传统计算方法结果和有限元解吻合程度良好,进而验证了简化计算方法的正确性;弯矩剪应力分量对总剪应力有一定的削弱作用,轴力剪应力分量对其有一定的增大作用;弯矩剪应力分项系数沿纵向逐渐减小,且其在总分项系数中占比较大,轴力分项系数沿纵向逐渐增大,且其占比甚小.因此,在计算变截面箱梁剪应力时主要考虑剪力和弯矩的影响.
Abstract:
In order to simplify the calculation method of the shear stress with a variable section box girder, the traditional calculation method of shear stress was established by the differential relationship of the beam segment and the equilibrium differential equations of micro-elements. Based on the analysis of the similarity between the transverse distribution modes of shear stress, the concept of converted shear force was put forward, and the partial factor of shear stress was introduced. A simplified calculation method for the shear stress of the variable section box girder was established. The calculation example of the variable section with a cantilever box girder shows that the shear stress obtained by the simplified calculation method is in good agreement with that of the traditional calculation method and the finite element solution. The correctness of the simplified calculation method is verified. The shear stress component of bending moment weakens the total shear stress to a certain extent, and the axial shear stress component increases it to a certain extent. The partial factor of bending moment shear stress gradually decreases along the longitudinal direction, which accounts for a large proportion in the total partial coefficient, while the partial factor of axial force gradually increases along the longitudinal direction, and its proportion is very small. Therefore, shear force and bending moment are mainly considered when calculating the shear stress of a variable section box girder.

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相似文献/References:

[1]严善宽.箱梁畸变应力及其在截面扭转中的影响[J].东南大学学报(自然科学版),1984,14(1):91.[doi:10.3969/j.issn.1001-0505.1984.01.010]
　Yan Shan-kuan.The Distortional stresses of Boxed Girder and Their Influences Upon The Twist of Girder Section[J].Journal of Southeast University (Natural Science Edition),1984,14(1):91.[doi:10.3969/j.issn.1001-0505.1984.01.010]

备注/Memo

备注/Memo:
收稿日期: 2020-06-30.
作者简介: 张玉元(1989—),男,博士,讲师; 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(51968040, 51468032)、甘肃省重点研发计划资助项目(20YF3FA039)、兰州交通大学青年基金资助项目(2018017).
引用本文: 张玉元,张元海,张慧.基于换算剪力的变截面箱梁弯曲剪应力计算方法[J].东南大学学报(自然科学版),2021,51(1):16-22. DOI:10.3969/j.issn.1001-0505.2021.01.003.
更新日期/Last Update: 2021-01-20