Abstract
A sufficient understanding of mechanical performance of self-anchored suspension bridge with double-sided steel box girder is essential for design and normal use as such bridges are widely built in urban bridge. Using the Yunlongwan Bridge which is a suspension bridge with ultra-wide double-sided steel box girder as an example, this paper investigates its deformation and mechanical performance under vehicle load. Firstly, based on the field test results, the deformation performance of the bridge and the stress distribution of the main girder are analysed, with emphasis on the shear lag effect of double-sided steel box girder. Then, a multiscale model of the bridge was built, and the accuracy of the model was verified by comparison with the test data. Finally, the influence of design parameters on the mechanical behaviour of double-sided steel box girder is studied by numerical simulation. The results show that the deformation of the bridge has good symmetry, there is obvious shear lag effect on the main girder, and the U-rib thickness, diaphragm spacing, and vehicle load could significantly affect the stress of the main girder top plate. The obtained analytical results lead to a better understanding of the mechanical performance and provide reference for the design of self-anchored suspension bridge with double-sided steel box girder.
Highlights
Due to the progress of bridge construction technology and the demand for practicability and appreciation of municipal bridges, self-anchored suspension bridge has become a very competitive bridge type because of its economy, elegant appearance, good adaptability, and reasonable stress state [1]
When the double-sided steel box girder is used as the main girder of the self-anchored suspension bridge, its spatial mechanical performance is complex under the influence of huge force and big width [16]
Because the mechanical behaviour of the ultra-wide double-sided steel box girder was complex and there was little research at present, this study specially studied the mechanical behaviour of this kind of girder and focused on its shear lag effect
Summary
Due to the progress of bridge construction technology and the demand for practicability and appreciation of municipal bridges, self-anchored suspension bridge has become a very competitive bridge type because of its economy, elegant appearance, good adaptability, and reasonable stress state [1]. Some self-anchored suspension bridges with double-sided steel box girder have been applied to practice. Ese make the stress characteristics, stress distribution, and structural load response of self-anchored suspension bridge with double-sided steel box girder become key issues in the field of bridge engineering [5]. When the double-sided steel box girder is used as the main girder of the self-anchored suspension bridge, its spatial mechanical performance is complex under the influence of huge force and big width [16]. As to make up for the deficiency of the existing research, in this paper, the Yunlongwan Bridge was used to study the overall mechanical properties and deformation of ultra-wide double-sided steel box girder self-anchored suspension bridge under vehicle load. Based on the established model, the effects of U-rib thickness, diaphragm spacing, and vehicle load on the mechanical properties of the top plate of key sections were studied. is study contributes to the interpretation of the complex mechanical behaviour of self-anchored suspension bridges, which is of great importance for bridge design and operational safety
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