碳纤维主缆悬索桥静力性能研究

Study on Static Performance of Suspension Bridge in Main Cable with Carbon Fiber

以润扬长江大桥为背景,基于主缆等强度和等刚度原则,拟定2座等跨度的碳纤维主缆悬索桥,并运用三维非线性有限元理论进行了温度变化、支座位移和车辆荷载作用下的静力特性分析。分析结果表明,与钢主缆悬索桥相比,采用碳纤维主缆后,结构的内力有些增大,但其变形特征基本接近。因此,大跨度悬索桥采用碳纤维主缆是可行的,但主缆截面的确定建议采用等刚度的方法。

Based on the eegineering of Ruiyang Yangzi River Bridge, two equal-span suspension bridges in main cable with carbon fiber are drafted according to the principles of equal-strength and equal-stlffness. The static characteristics are analyzed subjected to temperature, support displacement and vehicle load by the means of three-dimensional finite dement theory. Comparing with steel main cable, the results show structural internal forces increase with similar deformation characteristics after adopting main cable with carbon fiber. Thus, it is feasible to apply main cables with carbon fiber to suspension bridges, but it suggests that main cable section is determined by equal-stiffness method.