Upgrading the 4th Ring Transportation Corridor in Zhengzhou, China - Optimized Camber Analysis for close to 1,200 Precast Bridge Frames

The City of Zhengzhou is a major transportation hub in the heart of China. The fast-growing city was in need of an additional elevated expressway to increase the traffic capacity from 10 lanes to 18 lanes on the 4th Ring Transportation Corridor. The additional elevated expressway has a total length of 93.3 km and faced complex boundary conditions. 1,200 different bridge-frames were designed for the elevated expressway. The precast segmental bridge frames are continuous girders or rigid frame systems. The short-line match-casting system was utilized for the fabrication of close to 50,000 unique segments. Parameter studies were performed to better understand the influence of the boundary conditions and to optimize the camber analysis. This approach reduced the modeling effort tremendously and allowing the camber data for 1,200 bridge-frames to be analyzed in an accelerated time frame. The largest precast segmental bridge project in the world was partially opened to traffic in 2020 and is now fully operational.

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