ABSTRACT
The ultra-wide double-sided steel box girder self-anchored suspension bridge can be better used in urban bridge construction due to its delicate linear shape and light structure, as well as its characteristic of not being restricted by geological conditions. Against the background of Yunlongwan Bridge, aiming at the ultra-wide separated steel box girder, ANSYS finite element analysis software is used to establish the beam-shell element combination model to study the lateral deformation and stress at the mid-span target section under eccentric load. The stress amplitude of the roof and its distribution and diffusion along the transverse direction under different stiffness of the bridge are analyzed. Finally, the influence of the tensile stress and stress amplitude of the bridge deck on the fatigue of the bridge structure and the durability of the bridge deck pavement is discussed.The conclusions are as follows: (1) The beam-shell composite bridge model can better simulate the stress and deformation of the key position of the real bridge. (2) When multiple vehicles travel, the stress field superposition will occur in the local position of the bridge deck; (3) Under partial load condition, more than 60% of the load will be borne by the loading side, and the stress concentration is more obvious. (4) The stiffness of longitudinal and transverse beams will significantly affect the stress amplitude of bridge deck, and there is a negative correlation between stiffness and stress. (5) There is a primary functional relationship between axle load and stress response of bridge deck.
