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采用比例模型和油阻尼器 ,对斜拉桥中采用油阻尼器的斜拉索的减振问题进行了试验研究。通过一系列自由振动试验 ,测量了由于油阻尼器增加的索模态阻尼比 ,讨论了增加的模态阻尼比与阻尼器阻尼系数之间的关系。对斜拉索——油阻尼器系统进行了谐和平面激励 ,考察了系统的线性和非线性动力特性。自由振动试验证实了理论预测 ,即当达到最大模态阻尼比时 ,阻尼器存在一个最佳阻尼值。自由振动试验也证明了理论结果 ,即由于频率避让 ,索垂度对阻尼器性能有影响。强迫振动试验抓住了非线性索振动的一系列特点 ,并证明将一个适当选择的油阻尼器安装在索上能大大减小索的振动。
Using the proportional model and the oil damper, the damping of the cable stayed cable with oil damper in the cable-stayed bridge was experimentally studied. Through a series of free vibration tests, the relationship between the increased modal damping ratio and the damper damping coefficient was discussed due to the increase of cable modal damping ratio due to the oil damper. The harmonic plane excitation of the stay-cable-oil damper system was investigated, and the linear and nonlinear dynamic characteristics of the system were investigated. Free vibration test confirmed the theoretical prediction that when the maximum modal damping ratio is reached, the damper has an optimum damping value. The free vibration test also proves the theoretical result that the cable sag has an influence on the damper performance due to frequency avoidance. The forced vibration test captures a series of characteristics of nonlinear cable vibration and proves that installing a properly selected oil damper on the cable can greatly reduce cable vibration.