Analysis Of The Final State And Construction Control Of The Suspension Bridge With Spatial Cable System

Base on the traditional suspension bridge, a new type of the bridge that with spatial cable system has gained applications. This new kind of bridge not only achieves attractive appearance, but also has good mechanical performance. Spatial cable suspension bridge shows a tridimensional cable style composing of its main cable and its suspender; the transverse and the torsion stiffness of this kind of bridge are improved and the horizontal load-bearing capacity of the cable system is enhanced. However, there are difficulties in the analysis on the final and the construction state of the suspension bridge with spatial cable system. Base on the project of No.1 bridge in Qinglongshan Park, the optimization of the final state and the analysis of the construction state are finished in this paper.The non-linear finite element optimization method, based on nonlinear adjustment computation, is discussed in this paper. With the help of RM, a professional bridge software, the finite element model of final state optimization of the bridge No.1 Bridge in Qinglongshan Park is established. Furthermore, the reasonable final state of the bridge is obtained, targeting the vertical displacement of nodes of the main girder and the longitudinal displacement of the nodes of the main cable to be null and the invariant of the main cable rise.The summarization of characteristics of non-displacement of cable saddle method and the special way of installing of spatial cable system is given in this paper. The non-displacement cable saddle method is introduced to obtain the accurate state of the bridge during the construction procedure and the key point of the computation of suspension bridge with spatial cable system in construction state is discussed. Based on the non-linear finite element software, the system transformation is analyzed. Moreover, the parameters of the key point in the construction control are given. Additionally, the characteristics of the main cable displacement and the growth of the hangers axial force in the system transformation are discussed and the special use of the method of non-stress state in this bridge is analyzed.