Calculating method of structural robustness of double-tower cable-stayed bridge with steel truss girder

ZHENG Xiao-bo; ZHAO Yu; HE Shuan-hai; ZHANG Gang

Volume 17 Issue 5

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ZHENG Xiao-bo, ZHAO Yu, HE Shuan-hai, ZHANG Gang. Calculating method of structural robustness of double-tower cable-stayed bridge with steel truss girder[J]. Journal of Traffic and Transportation Engineering, 2017, 17(5): 27-38.

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ZHENG Xiao-bo, ZHAO Yu, HE Shuan-hai, ZHANG Gang. Calculating method of structural robustness of double-tower cable-stayed bridge with steel truss girder[J]. Journal of Traffic and Transportation Engineering, 2017, 17(5): 27-38.

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Calculating method of structural robustness of double-tower cable-stayed bridge with steel truss girder

School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

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Author Bio:
ZHENG Xiao-bo(1986-), male, doctoral student, zhengshi.yan@163.com

HE Shuan-hai(1962-), male, professor, PhD, 1943811337@qq.com
Received Date: 2017-07-21
Available Online: 2022-08-11
Publish Date: 2017-10-25

Abstract

Abstract

In order to ensure the structural robustness of double-tower cable-stayed bridge with steel truss girder, all-round multipoint temperature compensation system was developed based on the Xinjiang Guozigou Bridge and field structure test.The strain, deflection and cable force increment of steel truss girder were measured under specific loading conditions, and the specific locations of important components of steel truss girder and stay cables were determined.Based on the experimental result and the generalized structural stiffness theory, the robustness importance factors of cables and chords were analyzed by using the finite element model of bridge structure, and the most critical failure model of cable-stayed bridge was studied.Study result shows that the regularities of the measured data of steel truss girder strain under various working conditions are good, and the ratios of measured and theoretical values of strain and deflection are less than 1.0, so the bearing capacity and anti-deformability of steel truss girder meet the design requirements, and the girder has sufficient safety reserve.The maximum deflection of the girder under eachloading case is at the middle of main span and can reach to 237 mm, so the girder has strong antideformability.Because the ratios of the measured increments of cable force and theoretical values are less than 1.0, the stay cables have safety reserve to a certain extent.The chords at control sections and the specific stay cables of the girder have higher importance factors, the factors of stay cables are larger than the values of the chords, and the importance factor distributions of the chords concentrate in the middle of main span and nearby areas of main pylons.According to the distributions of importance factors of stay cables, the damage of single stay cable can causes the collapse of overall structure, and the failures of more than two stay cables will result in the progressive collapse of entire structure.The failures of the longest stay cable of main span and the chords at its middle, as well as the chords at the supports of side spans and near the main towers, are more adverse to the entire bridge.
- bridge engineering,
- double-tower cable-stayed bridge with steel truss girder,
- structural robustness,
- chord,
- stay cable,
- field test,
- generalized structural stiffness,
- importance factor

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References

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