Research on Skew Coefficient for Stresses of Skewly Supported Three-Span Continuous Box Girders

Abstract:

Skewly supported continuous box girders have special mechanical properties compared with common continuous box girders. Skew coefficient for stress of skewly supported three-span continuous box girder is introduced to reflect the decrease degree of the normal stresses at the cross section of the middle span of the box girder. The finite element models of the skewly supported three-span continuous box girders with different skew angles are established by applying the SHELL63 shell element in software ANSYS. The variation of the skew coefficient for stress at different calculation points of middle span cross section under concentrated load is analyzed and the corresponding influence law is revealed. Research results show that the skew coefficient for stress of top slab is different from that of bottom slab at the cross section of the skewly supported three-span continuous box girder. The skew coefficient for stress of top slab is smaller than that of bottom slab. Skew coefficient for stress decreases with the increasing of the skew angle. Because of the shear lag effect, the minimal skew coefficient for stress of flanges occurs at the free tip of cantilever slab while the maximal skew coefficient occurs at the intersection of web and flange slabs.

• Periodical: Applied Mechanics and Materials (Volumes 587-589)
• Pages: 1483-1487
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.587-589.1483
• Online since: July 2014
• Authors: Liang Liu*
• Keywords: Box Girder, Finite Element Method (FEM), Shear Lag Effect, Skew Angle, Skew Coefficient for Stress

References

[1] Xu Ruochang, Zhang Yuanhai. Structural Response of Skewly Supported Box-girder Bridges[J]. China Civil Engineering Journal, 1992, 25(4): 15-22.

[2] Zhang Yuanhai. Internal Force Calculation and Influential Factor Analysis of Skewly Supported Continuous Beam [J]. Journal of Lanzhou Railway Institute, 2000, 19(6): 41-44.

[3] Su Yandong, Li Lin, Bai Xin, Zhang Yuanhai. Influence of Skew Angle on Stress of Skewly Supported Continuous Box Girder [J]. Journal of Lanzhou Jiaotong University, 2013, 32(3): 8-11.

[4] Zeng li. Oblique  beam bridge combined finite element analysis [J]. Engineering Structure, 2003, 23(4): 44-46.

[5] Lin Yuliang, Li Wei, Zhu Junzuo, Mechanics Characteristics Analysis of Skew Girder Bridge [J]. North Traffic, 2006, 9(4): 54-57.

[6] Li Guohao. Load Distribution of the Skew Bridge with a Skew Deck [J]. Journal of Tongji University, 1994, 22(4): 395-400.

[7] Liu Jujiu. Research  on the part of Load Transverse Distribution of Skew Girder  Bridge [J]. Municipal Technology, 2002, 3(3): 42-45.