Research on Mechanical Properties on Mixed-Tensioned Precast U-shaped Girder in Rail Transit

In this paper, the mechanical properties of the mixed-tensioned precast U-shaped girder are analyzed and evaluated by method of FEM and static loading test taking the Rail Transit Line 8 in Qingdao as engineering background. The feasibility of design and construction is verified about the mixed-tensioned precast U-shaped girder which is a type of new product. At the same time, two types of precast U-shaped girder by using pre-tensioning method and post-tensioning method are made up with the same section and quantity of prestressed steel strand of mixed-tensioning method, and their mechanical properties of stress and deformation are compared and analyzed by FEM. The results show that the mechanical behavior of mixed-tensioned precast U-shaped girder meets relevant codes requirement, and its mechanical properties have a certain superiority because of combining the advantages of pre-tensioned U-shaped and post-tensioned U-shaped girder, so the mixed-tensioned precast U-shaped girder has a certain application prospect.