# [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] 点击复制 基于换算剪力的变截面箱梁弯曲剪应力计算方法() 分享到： var jiathis_config = { data_track_clickback: true };

2021年第1期

16-22

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

Author(s):
School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

Keywords:

U448.213
DOI:
10.3969/j.issn.1001-0505.2021.01.003

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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