Abstract:To solve the design problem of the pylon-girder-pier combination section of column-pylon cable-stayed bridge when the lateral dimension of the pylon column is limited, relying on Luobu River Bridge in Shanghai - Wuhan Expressway, the structural design and stress performance of the pylon-girder-pier combination section of a wide-pier narrow-pylon structure are studied through the theoretical analysis and numerical simulation. The reasonable structure and corresponding design method of the combination section of the column pylon and the main girder of the wide-pier narrow-pylon structure are studied, and the stress of this new structure is analyzed. The results show that the combination section of wide pier and narrow pylon can form a reasonable structure form by setting the reasonable connecting beams and transition structure in the connection section, which can meet the requirements of local force transmission. The rigidity transition section is set in the longitudinal direction of the bridge to increase the height of the main girder, cooperate with the transverse arc transition structure and improve the rigidity connection between the main girder and the wide pier in order to make the internal force of the main girder directly transmitted to the wide pier and to reduce the influence on the narrow pylon. The pylon-girder-pier combination section of wide pier and narrow pylon has the reliable force transmission and smooth stress transmission. The stress state is within a reasonable range. The structural form and design method of the formed wide-pier narrow-pylon combination section can provide the reference for the design of the similar combination sections when the transverse dimension of the pylon column is limited.
