ABSTRACT
In order to study the spherical hinge stress state and unbalanced moment prediction calculation method of flat rotating bridges under different working conditions, the actual project of the Wuhan-Dawu Expressway Hekou Section Turnpike Bridge is used as the background. The spatial modeling of the spherical hinge structure of the rotating system is carried out based on the finite element analysis software Abaqus. The effects of spherical radius and eccentricity on the spherical hinge stress and the displacement difference between the two sides of the edge under different bridge self-weight are analyzed. This is to investigate the effects of the stress concentration phenomenon at the edge of the spherical hinge on the calculation of unbalanced moment prediction and to further optimize the calculation formula of unbalanced moment prediction. The results show that the stress distribution of the ball hinge structure of the rotating bridge is small in the middle and large on both sides, and the stress at the edge of the ball hinge is much larger than the internal stress. Self-weight and spherical radius of the bridge have a large influence on the stresses in the spherical hinge. The eccentric distance mainly affects the displacement difference between the two sides of the ball hinge edge. Based on the unbalanced moment calculation formula of the ball-hinged stress difference method, the optimized coefficient λ is introduced to accurately locate the stress measurement points. The errors between the calculation results of the optimized formula and the measured values are 8.3% and 3.4%, which are 8.6% and 11.4% less than the errors of the traditional calculation formula, respectively. It can provide a reference for the same type of rotating bridge projects.
