Influence of Error of Unstressed Cable Length on Mechanical Behavior of Thousand-Meter-Scale Hybrid Girder Cable-Stayed Bridge

Abstract

Taking Edong Yangtze River Bridge as the research subject, the influence of error of unstressed cable length on the geometric shape and internal force of super-span hybrid girder cable-stayed bridge during completion is studied on the basis of the geometry control method with full consideration of the structural nonlinear geometrical effect. Moreover, the mechanical behaviors of the center and side spans of the bridge and their control strategies are discussed. The analysis shows that structural differences between the center and side spans exerted an influence on the geometric shape and internal force. The influence of unstressed cable length error on the geometric shape in the center span of the completed bridge is greater than that of the side span, whereas the impact on internal force in the side span is greater than that in the center span. The mechanical behavior is relatively independent between span types. In addition, the percentage change of the girder stress reaches the maximum level in the steel/concrete composite segment, in which the mechanical behavior is highly complicated. Therefore, its design and construction require close attention. Moreover, the difference in stiffness between the center and side spans has a remarkable impact on cable force redistribution in the completion stage, and the changes in cable force differ between the span types.