Exploration of Super-Large Span Steel Truss- Fabricated Concrete Composite Continuous Rigid Frame Bridges

Abstract

<p>Basing on the existent study of prestressed concrete (PC) continuous rigid frame bridge and steel- concrete composite bridge, a new type of super-large span steel truss-concrete composite continuous rigid frame bridge (STCB) constructed by cantilever method is proposed in this paper. Structure system and characteristic features are discussed, and the cantilever construction methods and major construction steps are introduced. An example of exemplary 386m-span STCB design justifies the feasibility and reasonability, in which the respective material advantages of steel and concrete can be fully used, the self-weight of the main beam are effectively decreased and the smaller substructure sizes are relatively enabled with much larger span ability. In addition, STCB is basically robust against the usual defects of excessive harmful deflection due to concrete cracking and creeping. In the end, the general characteristics and application prospect are presented.</p>