The Cable Cutting Phenomenon in the Construction of Suspension Bridge and Its Optimization Scheme

The main cable's line shape of suspension bridge with matching cable saddle is designed according to a rational completion status of the bridge. However, the cable line shape of the suspension bridge compared with designed cable saddle have a deviation angle in the construction process. This condition resulted in cable cutting between the main cable and saddle, which was called the cable cutting phenomenon. The cable cutting phenomenon is unfavorable and difficult to avoid completely. To ensure safety, taking not only corresponding measurements of the cable structure in the construction process, but also optimizing the construction scheme to reduce the deflection angle between the cable and the saddle. In order to reduce the phenomenon of cable cutting in the construction process, this paper analyzes an example of the self-anchored suspension bridge with finite element calculation, adjusting of the suspender tensioning order, taking into account linear and cable forces, and optimizing the tension scheme. The result shows that the consideration of the cable cutting effect on the main cable is necessary for suspension bridges. Appropriate tensioning optimizing scheme can significantly eliminate the unfavorable condition of the main cable in system conversion process.