应用碳纤维索的大跨度斜拉桥静力学特性分析

为了验证碳纤维拉索在大跨度斜拉桥中的应用可能性,以跨度1 400 m的钢斜拉桥设计模型为对象,用三维非线性计算理论分析了碳纤维拉索斜拉桥的承载能力、静力抗风特性以及使用荷载作用下的力学行为.通过与同跨度钢索斜拉桥比较,讨论了碳纤维拉索对大跨度斜拉桥静力学特性的影响.分析结果表明,(1)由于拉索没有屈服点,在极限状态下可以分担比较多的竖向荷载,桥梁的极限承载能力有所提高;(2)具有同样的抗风稳定性;(3)在正常使用条件下的最不利压缩应力基本上一致;(4)竖向变形刚度有所下降.

Static behavior of long-span cable-stayed bridges using carbon fiber composite cable

To gain understanding of the applicability of carbon fiber composite cable (CFCC) in long-span bridges, the static behavior and limited strength of long-span cable-stayed bridges with CFCC and that with steel cable were compared by 3D nonlinear analysis. A 1()400()m cable-stayed bridge model was used. The (results) showed that, (1)the limited strength of bridge with CFCC is larger than that with steel cable, (because) CFCC has no yield point and share more load at ultimate state; (2)the static stability of long-span cable bridges with CFCC under wind loading is similar to the steel cable bridges; (3)the maximum compressive stress in the girder is nearly the same for both bridges; (4)the stiffness in-plane under live loading will become small if CFCC is used.