Abstract:Based on the influencing factors of using the partial cable-stayed system to reinforce the main girder alignment, the influence of the main girder deformation, the stayed cable elongation, and the compression and deflection of the main pylon under the external load on the deflection of the main girder is analyzed. The reinforcement calculation method of two-span continuous girder is derived. According to beams，the mechanics mechanism of partial cable-stayed reinforcement system based on linear control is expounded. According to the disease detection results of a Yellow River bridge and on the basis of analyzing the cause of disease and the internal force distribution of bridge, the reconstruction scheme of partial cable-stayed reinforcement system is proposed, and the deflection of the main girder before and after reinforced is calculated. Compared with the finite element results, the feasibility of the proposed reinforcing calculation method is verified.
