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为了探讨CFRP索在缆索承重桥梁中应用的可能性,以缆索等轴向刚度为原则,基于润扬长江大桥和1400 m主跨斜拉桥设计方案,分别拟定了同跨径应用CFRP索的悬索桥和斜拉桥,并运用三维非线性空气动力稳定性分析方法进行了抗风稳定性分析。分析结果表明:缆索承重桥梁采用CFRP索后,由于结构自振频率特别是扭转频率的显著提高,其空气动力稳定性要好于钢索的缆索承重桥梁。因此从抗风稳定性角度而言,缆索承重桥梁采用CFRP索是可行的,缆索截面尺寸应采用等轴向刚度原则来确定。
In order to discuss the possibility of CFRP cable applied in cable-bearing bridges, based on the principle of equiaxed rigidity of cables and the design scheme of Runyang Yangtze River Bridge and 1400 m main-span cable-stayed bridge, And cable-stayed bridge, and the stability analysis of wind-resistance is carried out by using the three-dimensional nonlinear aerodynamic stability analysis method. The analysis results show that the aerodynamic stability of the cable-bearing bridge with CFRP cable is better than that of the cable cable bearing bridge due to the remarkable increase of natural frequency, especially torsional frequency. Therefore, from the point of view of wind stability, it is feasible to adopt CFRP cable for load-bearing bridge of cable and the sectional dimension of cable should be determined by the principle of equiaxial rigidity.