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Furthermore, precast construction is applied for U-shaped girder construction to achieve construction safety, shorten the construction time, and reduce costs. In addition, the U-shaped girder uses prestressed steel and polypropylene fiber (Figure 2(b)), which can obviously increase its load bearing capacity and crack resistance. As shown in Figures 1 and 2(a), the structure uses the bottom slab to support the rail tracks and trains, and thus it can reduce the height of the girder and the rail station, while, simultaneously, the webs of the U-shaped girder can help isolate train noises and make trains run more safely.
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It has an open thin-walled U-shaped section, which is composed of a bottom slab, web, and flange slab. Compared to many traditional bridge types, such as the box girder, T-shaped, and hollow slab girder, the U-shaped girder has many advantages. The U-shaped girder is a new type of viaduct structure for urban rail transit systems in China, and it is based on the channel girder. Therefore, many cities have adopted urban rail transit development as an important strategy to solve traffic problems.
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Rail transit, as a low-contamination, low-energy consumption, and high-efficiency means of transportation, has played a vital role in the urban transportation system. In recent years, with the development of China’s economy, traffic congestion and oversaturation are some of the major factors restricting the urbanization process in the country. Some suggestions are provided for avoiding cracks based on the results of the research. The risk of cracks can be reduced by increasing the thickness of the flange slab and changing the anchorage position and prestressed steel layout. The results indicate that the extremely low rigidity of the web and oversize of the web longitudinal prestressed steels are the main reasons for the cracks. The effects of the main design parameters, such as the flange slab thickness, anchorage position, and prestressed steel layout, were evaluated based on the results of the FE analysis. The nonlinear material properties of the polypropylene fiber concrete and steel were discussed and used in the finite element model. In this study, a cracking accident of a U-shaped girder, which happened during the prestressed steel tensioning, was studied by field investigation and mechanical analysis through the finite element (FE) method.
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Although it employs polypropylene fiber concrete to avoid cracks, the girder is still easier to crack than other traditional structures owing to its special open thin-walled cross section. The U-shaped girder is a type of open thin-walled structure, which is used in urban rail transit engineering.
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