中文摘要：

为克服大跨径斜拉桥整体刚度降低,提出一种新型斜拉桥方案,即CFRP与钢组合拉索斜拉桥,介绍碳纤维增强塑料CFRP与钢组合拉索斜拉桥的设计理念,并提出斜拉索构造以及斜拉桥结构的设计方法,研究了CFRP与钢组合拉索斜拉桥经济性能,并推导出该类斜拉桥的材料用量与造价公式.基于所推导公式,对其跨长、塔高以及价格比分别进行经济性能参数分析,得到CFRP与钢组合拉索斜拉桥的经济性能变化规律,为该类斜拉桥设计提供理论依据,从理论上证明CFRP与钢组合拉索斜拉桥的经济性能优势和未来替代传统斜拉索应用在斜拉桥上的可行性.

英文摘要：

To solve current stiffness problems of long-span cable-stayed bridges,a new cable-stayed bridge with carbon fiber reinforced polymer（CFRP）and steel composite stay cables was proposed.Firstly,the de-sign strategies and procedures for the proposed cable-stayed bridges were introduced.The equations to calcu-late the material amounts and costs of the proposed cable-stayed bridges were also derived.By doing this,the economic behaviors of the composite bridges,which were the emphasis of this paper,were then studied.A parametric study with regard to span length,pylon height,and cost ratio（the cost ratio of CFRP stay cables to steel stay cables）was finally conducted,which determined the developing trend of economic behaviors.It is proved in this study that the application of CFRP and steel composite stay cables in cable-stayed bridges is fea-sible from the economic viewpoint and the proposed composite cable-stayed bridges could become an excellent alternative to the traditional cable-stayed bridges in the future.