Abstract
At present, curved box girder bridges with small radius is widely used in modern highway and urban road interchange flyover, especially in the design of ramp bridge of interchange flyover. Taking the ramp of Liaoyang Road to Haier Road Flyover in Laoshan District of Qingdao as an example, this paper calculates and compares the first principal stress at different positions of typical cross-sections by elementary beam theory and numerical calculation theory, and analyzes the mechanical reasons for serious cracks in the bridge.
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