Key Design Technologies of New Cable-Stayed and Steel Truss Composite Bridge

Abstract

Taking Ningbo Yongjiang Sanguantang Bridge as the engineering background, the plan of new cable-stayed and steel truss combined bridge is created, according to the Construction conditions including navigation and aviation restriction and engineering geology, as a new combined bridge system from the combination of extradosed cable-stayed bridge and steel truss. This paper makes a deep study and coMParison of four systems, such as 3 span continuous rigid frame bridge, 3 span continuous girder bridge, single cantilever rigid frame with rigid hinge, single cantilever beam with rigid hinge, and a structural system suitable for this type of bridge has been found: that is single cantilever beam with rigid hinge system. On the basis of the study and analysis of the structure system, the key technology of the anchor position at the end of the truss, and the integral static and dynamic performance and seismic performance, this paper has completed the conceptual design of the new bridge structure, and it shows that the bridge has excellent static and dynamic mechanical properties and implementable performance.