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针对1 400～2 800m主跨斜拉桥整体刚度不足的问题,提出一种新型结构方案——碳纤维增强塑料(CFRP)-钢组合拉索斜拉桥。该方案将CFRP斜拉索与传统钢斜拉索同时应用于斜拉桥中,组合2种材料高强轻质及弹性模量高的优点,以达到提高斜拉桥整体刚度的设计目的。通过基于力学与造价的参数分析提出该组合拉索斜拉桥的3种设计原则:等安全系数等效刚度最优、等安全系数等效刚度性价比最优、等造价等效刚度最优,并分别给出详细的设计步骤及设计用图。最后,进行了多种方案1 400m主跨斜拉桥试设计。结果表明:CFRP-钢组合拉索斜拉桥在力学与经济性方面均具有一定优势,其工程应用具有可行性,是主跨为1 400～2 800m斜拉桥的优选方案之一。
Aiming at the problem of insufficient overall stiffness of 1 400 ~ 2 800 m main-span cable-stayed bridge, a new type of structural scheme, CFRP-steel cable stayed bridge, is proposed. The scheme applies the CFRP stay cables to the cable-stayed bridge simultaneously with the traditional steel stay cables, and combines the advantages of high strength and light weight and high elastic modulus of the two materials in order to achieve the design goal of improving the overall rigidity of the cable-stayed bridge. Through the analysis of parameters based on mechanics and cost, three design principles of the cable-stayed bridge are proposed: the equivalent stiffness of the safety coefficient is the best, the equivalent stiffness of the safety factor is the best, the equivalent stiffness is the best, Detailed design steps and design drawings are given respectively. Finally, a variety of programs 1 400m main span cable-stayed bridge trial design. The results show that the CFRP - steel composite cable - stayed bridge has some advantages in terms of mechanics and economy, and its engineering application is feasible. It is one of the preferred schemes for the main span of 1 400 ~ 2 800 m cable - stayed bridge.