【摘要】 首先通过对鞍座处CFRP丝的力学性能分析,建立了CFRP丝弯曲强度计算理论,利用理论公式分析了CFRP丝直径和弯曲半径对弯曲强度的影响,并对CFRP丝临界弯曲半径作出推算;接着对CFRP丝在鞍座处的抗弯性能进行了模型试验研究,实测了3种弯曲半径对应的弯曲极限拉力;最后对理论分析结果和试验实测结果作了对比。研究结果表明:CFRP丝在大跨悬索桥鞍座处的弯曲张拉效率超过90%;CFRP主缆弯曲强度计算值与实测值吻合较好;当弯曲半径一定时,弯曲强度随着CFRP丝直径的增大而线性减少,当CFRP丝直径一定时,弯曲强度随着弯曲半径的增大而非线性增加,CFRP丝临界弯曲半径随着CFRP丝直径的增大而线性增加;CFRP丝在鞍槽上的包角对弯曲极限拉力没有影响。更多还原

【Abstract】 Firstly,the bending strength theory of carbon fiber reinforced plastic(CFRP) wire was founded through analyzing the mechanical behaviors of CFRP wire in saddle,and influences of CFRP wire diameter and bending radius on bending strength were studied by theoretical formula.Then,the critical bending radius of CFRP wire was calculated,bending performance of CFRP wire in saddle was studied,the ultimate bending tensions with three kinds of bending radii were measured.Finally,the theoretical analysis results and test results were compared.The results show that the bending tensile efficiency of CFRP wire in saddle of long-span suspension bridge is more than 90%.Calculated values of bending strength of CFRP wire agree well with test values.If the bending radius is fixed,the bending strength decreases with the increase of diameter of CFRP wire,and the decreasing tendency presents linear.If the diameter of CFRP wire is fixed,the bending strength increases with the bending radius,and the increasing tendency presents non-linear.The critical bending radius of CFRP wire increases with the diameter of CFRP wire,and the increasing tendency presents linear,the bending angle of CFRP wire has no influence on ultimate bending tensile.更多还原