Research on Construction Control Technology of Concrete Beam Cable-Stayed Bridges Considering Coupling Deformations

Abstract

The main construction control parameters for concrete beam cable-stayed bridges using cable-stayed form traveler construction include the construction pre-camber and the intermediate control cable tension. Traditional calculation analysis treats the form traveler form traveler as a concentrated load, and then obtains the deformation parameters of the form traveler through preloading tests to calculate the elevation for positioning the form traveler. The limited stiffness of the cable-stayed form traveler leads to significant deformations under the action of the stay cables, which further affects the cable tensions and results in substantial deviations in construction control parameters. This paper establishes a construction control calculation method for concrete beam cable-stayed bridges that takes into account the coupled deformations of the form traveler, beam, and stay cables. Through theoretical analysis combined with finite element software calculations, it reveals that the coupling deformations of the form traveler significantly affect the construction pre-camber and the tensions in the stay cables. The calculated construction pre-camber values and the control values for the tension in the intermediate steps of the stay cables, which consider the coupled deformations of the form traveler, ensure that the structural stresses of the form traveler and the main beam remain within a safe range.