Abstract: The use of the two is completely different, one is to provide people with travel, transportation safety and convenience, one is to provide people with a safe and comfortable living place, so the former works wide, long and smooth, the latter is engineering intensive, expanding capacity into the air. Because of the different uses, the bridge structure is mainly beam-type, truss-type and other horizontal components, while construction works pay more attention to vertical components such as columns and walls. The vertical variable load of the bridge structure is the moving load and to produce impact, the vertical variable load of construction works only changes in size over time, only some plants have driving beams to calculate the moving load. The horizontal variable load of the upper structure of the bridge is a side-by-side wind load, and the coefficients of the wind load are very different from those of the construction project; The variable load of the lower level of the bridge is a lateral flow of water, the stability of the foundation is particularly important, requires deep, heavy, stable, high-rise construction projects based on carrying capacity and sedimentation deformation. Bridge structure has long been exposed to wild and mud water environment, requiring the durability of components such as wind erosion, water erosion and atmospheric temperature to be more stringent than that of construction projects. Design specifications, design methods, construction samples are many different from construction projects.<br>Keywords: bridge engineering;
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