The Design of a River-crossing Pedestrian Bridge in Kunming City, China: a New Structure Form for Cable-supported Bridge

Compared with the traditional suspension bridge, the Songhua pedestrian bridge has no hangers, and the cable is under the stiffening girder in the mid-span position. The loads of human groups on the floor system are transferred to the cable by the brace strut of curve shape. This paper mainly introduced the structure design, the related parameters, the construction method，and the static and dynamic analysis. In the static analysis, the cable’s internal force and the stress characteristics of the stiffening girder have been discussed. Regarding the dynamic analysis, this paper compared the bridge’s natural vibration characteristics under different boundary conditions of the stiffening girder and the earthquake resistant behaviour and calculated the vertical acceleration by time-history. The results shows that fixing the two end of the stiffening girder can improve the natural frequency efficiently so as to avoid the happening of resonance.