大跨径组合梁斜拉桥概念设计

Conceptual Design of Long-span Composite Girder Cable-stayed Bridges

组合梁斜拉桥有向大跨径发展的趋势,重点明确大跨径组合梁斜拉桥概念设计阶段应该考虑的主要技术问题。从合理跨径界限、总体布置及主要参数等方面,对该桥型概念设计所应把握的规律及要点进行分析论述。从剪力滞后、收缩徐变、剪力钉滑移、非线性、合理成桥及施工状态确定等力学效应方面,对该桥型关键问题的技术动态进行阐述。最后指出,概念设计对大跨径组合梁斜拉桥的实践与发展十分重要。

The composite girder cable-stayed bridge has the great potential for development to longer span.In this paper, the principal technical issues of composite girder cable-stayed bridges that should be considered at the conceptual design stage are clarified. In the aspects of reasonable span limit, general arrangement and main structure parameters, 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 mechanical effects, such as shear lag, shrinkage and creep, slip of shear studs, nonlinearity,decision of reasonable finished bridge and construction state are described. Finally, the vital importance of conceptual design to the practice and development of composite girder cable-stayed bridge is emphasized.