大跨连续组合箱梁桥的概念设计

Conceptual Design of Long Span Continuous Composite Box Girder Bridge

简要说明大跨连续组合箱梁桥概念设计的意义,明确概念设计阶段应该考虑的主要技术问题。从总体布置、负弯矩区设计方法、结构关键构造、施工方法及其与设计的结合等方面,对该桥型概念设计所应把握的规律与要点进行分析论述。对负弯矩区桥面板设计原则、钢梁局部屈曲理论与构造的发展、设计与施工的相互依存性等关键问题的技术动态进行阐述,并指出其对大跨连续组合箱梁桥的技术与经济竞争力十分重要。

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.