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为了掌握CFRP拉索的阻尼特性以及建立相应的评价方法,用自由衰减振动试验方法测试了CFRP索、钢索以及CFRP丝、钢丝的阻尼特性,并用能量耗散原理以及振动理论探讨了拉索的结构阻尼和空气阻尼计算方法。结果表明:钢索的阻尼变化与应变能的比例关系明显,实测阻尼值与应变耗能理论计算结果一致,而CFRP拉索的阻尼实测值与理论结果之间存在一定的差异。长度1.8m的单丝阻尼与对应的应变大小相关性不大,应变耗能理论不能评价其阻尼特性,支点产生的阻尼效果不可忽视。
In order to grasp the damping characteristics of CFRP cable and to establish the corresponding evaluation method, the damping characteristics of CFRP cable, cable and CFRP wire and steel wire were tested by free-decay vibration test. The energy dissipation principle and vibration theory were used to investigate the damping properties of cable Structural damping and air damping calculation method. The results show that the relationship between the damping change and the strain energy of the cable is obvious. The calculated damping value is consistent with the theoretical calculation of strain energy dissipation. However, there is a certain difference between the measured results and theoretical results of the CFRP cable. The length of 1.8m monofilament damping and the corresponding strain size is not relevant, strain energy theory can not evaluate the damping characteristics of the fulcrum damping effect can not be ignored.