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为获得用于桥梁的CFRP拉索的阻尼特性,用自由衰减振动试验方法测试了CFRP线材(CFRP丝)和高强度钢丝的阻尼值,根据应变能比例阻尼理论分析了其弯曲变形的能量损失系数。通过不同振动频率条件下的测试结果比较了CFRP丝和钢丝的阻尼特性及其与振幅之间的相关性。结果表明,两种材料的振动阻尼均随应变幅值的增加而单调增加,但两者的变化趋势有差异。在同一应变幅值条件下,CFRP丝的实测阻尼值比高强钢丝的小。高强钢丝的能量损失系数与振幅无关,验证了能量损失理论对高强钢丝材料的阻尼计算的适用性。但CFRP丝的能量损失系数实测结果较离散,且与振幅有一定相关性,在特定振幅范围内可采用能量损失理论计算CFRP丝的阻尼。
In order to obtain the damping characteristics of CFRP cables used for bridges, the damping values of CFRP wires (CFRP wires) and high-strength steel wires were tested by the free-fall vibration test method. The energy loss coefficients of bending deformation of CFRP wires . The damping characteristics of CFRP wire and steel wire and their correlation with amplitude were compared by the test results under different vibration frequencies. The results show that the vibration damping of the two materials increases monotonously with the increase of strain amplitude, but there is difference between them. Under the same strain amplitude condition, the measured damping value of CFRP wire is smaller than that of high-strength steel wire. The energy loss coefficient of high strength steel has nothing to do with the amplitude, which verifies the applicability of energy loss theory to the damping calculation of high strength steel wire. However, the measured results of the energy loss coefficients of CFRP filaments are more discrete and have some correlation with the amplitude. The energy loss theory can be used to calculate the damping of the CFRP filaments within a certain range of amplitude.