Cooling Method Numerical Analysis of Suspender Cable Tension and Cable Saddle Pushing

Research purposes: When the long-span self-anchored suspension bridge could not use the general support method to install the steel box girder of main span, the "first cable-stayed, second suspension" overall construction plan was adopted in the world first. The most important process of the scheme was the system transformation from cable-stayed bridge to self-anchored suspension bridge. The suspender cable tension and main cable saddle pushing were realized in the numerical simulation of system transformation. The cooling method similarly with unstressed state control method was applied. Guided by this method, the system transformation whole process of Egongyan self-anchored suspension bridge was analyzed. The Egongyan self-anchored suspension bridge will be the world's largest span of 600 m self-anchored suspension bridge after the completion. The element selection and its parameter determination methods and techniques of the key components of suspension bridges were expounded in the state of two kinds of cable support system coexistence using ANSYS. Research conclusions: Through the numerical simulation, the changing rules of key components in the process of system transformation were analyzed. The conclusions are as follows: (1)All the cable units of the two models used their unstressed length to build the model under unstressed state control method. The coupling analysis model was remodel using the iterative calculation. (2) The cooling method makes the suspender cable cool to its unstressed cable length from modeling length. The cooling method also makes the deviator of main cable saddle cooled to near zero and realize the main cable saddle pushing. (3) The cooling method can be used in the calculation models of the suspension bridges system transformation process at suspension cable tension and main cable saddle pushing.