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为了探讨碳纤维复合材料在大跨径斜拉桥中应用的可能性,以拉索等轴向刚度为原则,拟定了一座主跨为500 m的应用碳纤维索的大跨径斜拉桥,并运用三维非线性计算理论进行了动力特性、静风特性和空气动力稳定性分析。分析结果表明大跨径斜拉桥采用碳纤维索后:(1)结构的自振频率有所提高;(2)静风作用下结构变形增大,但其静风性能却与钢索斜拉桥基本一致;(3)空气动力稳定性与钢索斜拉桥基本一致。因此从抗风性能角度而言,大跨径斜拉桥采用碳纤维索是可行的,但是拉索截面尺寸应采用等轴向刚度原则来确定。
In order to investigate the possibility of using carbon fiber composites in long-span cable-stayed bridges, a long-span cable-stayed bridge with carbon fiber cables with a main span of 500 m was designed based on the principle of equal axial stiffness of cables. The three-dimensional nonlinear computing theory is used to analyze the dynamic characteristics, the static wind characteristics and the aerodynamic stability. The results show that the carbon fiber cables of the long-span cable-stayed bridge are used: (1) the natural frequency of the structure is increased; (2) the deformation of the structure increases under the action of static wind, Basically the same; (3) aerodynamic stability and cable stayed bridge basically the same. Therefore, from the perspective of wind resistance, it is feasible to use carbon fiber cables for long-span cable-stayed bridges, but the cross-sectional dimensions of cables should be determined by the principle of equiaxial stiffness.