# Proposed New Analytical Method of Tower Load in Large-Span Arch Bridge Cable Lifting Construction
###### Abstract
[24] analyzed the strength and stability of the arch ribs and towers during the rotation construction of a steel pipe concrete arch bridge and evaluated construction safety. [PERSON] et al. [25] innovatively applied a cable lifting system to the girder installation of cable-stayed bridges for the first time. [PERSON] et al. [26] described in detail the cable lifting construction method of the Ningbo Mingzhou Bridge and analyzed and controlled the stress and deformation of the arch ribs during its construction process. [PERSON] et al. [27] proposed a new method for the mechanical analysis of the main cable of a cable lifting system, verified the new method by two examples, and finally applied the new method to the construction of the longest steel-truss cable-stayed bridge in the world. [PERSON] et al. [28] analyzed and optimized the lifting towers while constructing dendrite structures. [PERSON] et al. [29] presented the challenges encountered in the construction of the world's first double-deck high-speed railway arch bridge using the cable lifting method. [PERSON] et al. [30] proposed a finite element method for the mechanical analysis of the main cable in an arch bridge construction using the cable lifting method, which has a higher accuracy. In summary, scholars at home and abroad have achieved fruitful results in the cable lifting construction of arch bridges, but the research is mainly focused on construction schemes and the finite element analysis of the cable lifting of large-span arch bridges. There are relatively few studies on calculation theory, which mainly concentrates on the more basic suspension-cable calculation theory, and there is no set of calculation theories and analysis  
Figure 1: Cable lifting construction of large-span arch bridges: (**a**) Pingnan Third Bridge; (**b**) Jinghe Bridge. methods for arch bridge cable lifting construction. Therefore, it is necessary to propose simple and practical calculation methods for how to calculate and analyze more quickly and accurately for arch bridges with increasingly large spans, increasingly high towers, and more complicated cable systems. This paper presents the calculation method of the load acting on the tower by a cable system in the cable lifting construction of arch bridges and gives an example of applying it to the refinement analysis of a tower. The method is fast, accurate, and easy to operate and can be widely accepted by relevant practitioners. The main innovations of this article are as follows:  
* Based on the deformation coordination principle and suspension cable theory, the calculation method of the forces acting on a tower by a cable system when the rated load is lifted and moved on the main cable during the construction of an arch bridge is proposed. * The correctness of the calculation method was verified by measuring the displacements of the tower tops. * The calculation method is applied to tower analysis, and the method and example of tower refinement analysis is presented. This research is conducted according to the following organizational structure. First, based on the deformation coordination principle and suspension theory, a practical calculation method is proposed to calculate tower loads acting by a steel-cable system in arch bridge cable lifting construction. Second, the correctness of the calculation method is verified by measuring the displacement at the tower top using a large-span arch bridge under construction as an example. A brief description of structure, validation method, and validation process is given. Third, the calculation method is applied to towers of the case project, and its stability, load capacity, and deformation are analyzed to verify whether its mechanical properties meet the engineering requirements. Finally, some useful conclusions and recommendations are given.