A nonlinear iterative calculation was conducted on an S-shaped suspension bridge with couple tower and three-span to solve the design about main cable shape and unloaded cable shape.Firstly,an initial cable shape analysis was conducted,and the requirements for nonlinear iterative convergence on the initial shape were proposed.Then,through iterative calculation and analysis,the precise cable shape and unloaded cable shape of the special-shaped suspension bridge were obtained.And it was found that the unloaded cable shape of the bridge has a huge difference from the completed bridge shape.Finally,through static and dynamic analysis,the static and dynamic performance of the special-shaped suspension bridge was summarized and con-cluded.It was found that the bridge do not have a significant overall vibration pattern,and compared with con-ventional suspension bridges of similar span,the vibration period is smaller and the overall stiffness of the bridge is greater.
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