【摘要】 针对桥梁工程中钢拉索自重大、易腐蚀及传统纤维增强复合材料(fiber-reinforced polymer, FRP)平行索弯曲性能不足的问题，提出了一种轻质、耐腐蚀和高柔韧性的新型FRP柔性索。基于FRP柔性索三维有限元模型，分析了排列方式、捻距、捻向、摩擦系数和轮径比等参数对索体最大轴向应力和接触应力的影响规律，并提出优化设计建议。结果表明：圆形排列在接触应力控制方面更具优势，而正六边形排列在轴向应力分配与均匀性方面表现更优；内外层索股采用反向捻制，可使最大轴向应力减小11.3%;当捻距为12d～20d时，最大轴向应力随捻距增加而增大，而接触应力逐渐减小；增大摩擦系数有助于改善索股应力分布均匀性；当轮径比从17增大至40时，圆形和正六边形索体的最大轴向应力分别降低48.6%和47.4%,当轮径比≥30时，外层股轴向应力低于极限拉伸强度的70%。研究结果可为FRP柔性索在高腐蚀、高柔韧性环境中的工程应用提供参考。更多还原

【Abstract】 To address the problems of heavy self-weight and corrosion susceptibility of steel cables in bridge engineering, as well as the insufficient bending performance of traditional parallel fiber-reinforced polymer(FRP) cables, a novel FRP flexible cable is proposed. The proposed cable features light weight, excellent corrosion resistance, and high flexibility. Based on a three-dimensional finite element model of the FRP flexible cable, the influences of the key structural parameters including arrangement pattern, lay length, lay direction, friction coefficient, and drum-to-diameter ratio on the maximum axial stress and contact stress are systematically investigated, and the corresponding recommendations for optimal design are proposed. The results indicate that the circular arrangement exhibits superior performance in reducing contact stress, while the hexagonal arrangement provides a more uniform axial stress distribution. Adopting opposite lay directions for the inner and outer strands reduces the maximum axial stress by 11.3%. When the lay length ranges from 12d to 20d,the maximum axial stress rises with increasing lay length, while the contact stress gradually decreases.Increasing the friction coefficient helps improve the uniformity of stress distribution among strands.As the drum-to-diameter ratio increases from 17to 40,the maximum axial stress of circular and hexagonal cables decreases by 48.6%and 47.4%,respectively.When the drum-todiameter ratio is greater than or equal to 30,the axial stress in the outer strands remains below 70% of the ultimate tensile strength.These findings can serve as a reference for the engineering application of FRP flexible cables in highly corrosive and highly flexible environments.更多还原