Conceptual Design of Long Span Continuous Composite Box Girder Bridge

In this paper,the significance of conceptual design of long span continuous composite box girder bridge is briefly illustrated and the principal technical issues that should be considered at the conceptual design stage are clarified.In aspect of the overall arrangement,negative moment area design method,critical structural formation,construction method and the combination of the construction method with the design considerations,the laws and essentials that should be well understood in the conceptual design of the type of the bridge are analyzed and expounded.The technical trends of the key issues on the design principle of deck slabs at the negative moment area,development of local buckling theory and structural formation of steel girder and interdependence between the design and construction are described,and finally the vital importance of the afore-mentioned to the technical and economic competition of the long span continuous composite box girder bridge is pointed out as well.