既有研究结果和工程实践表明：当发生索桥耦合振动时，粘滞阻尼器提供给拉索的实际阻尼值远小于理论计算值。为保证耦合振动下的减振效果，文中提出利用常规粘滞阻尼器附加TMD的复合减振方法。为此，建立了拉索、粘滞阻尼器与TMD组成的理论分析模型，并开展了相应的室内试验。理论分析与试验结果的对比分析表明：根据最主要贡献模态设计的附加MTMD，能最大程度地协助粘滞阻尼器抑制该模态脉动；该复合减振方法可有效弥补索端粘滞阻尼器由于索－桥耦合振动等原因造成的减振效果损失问题。
Abstract
Both results of study and engineering practice showed that the damping effect of a viscous damper is weakened when cable-girder coupled vibration happens. In order to ensure good vibration damping effect of a viscous damper under cable-girder coupled vibration, a cable’s compound vibration reduction method with a viscous damper and an added MTMD was proposed here. A simplified theoretical model with cable, viscous damper and MTMD was analyzed using the complex modal analysis method, and a test model of a cable-damper-MTMD system was designed. Both theoretical analysis and test results showed that the added MTMD designed according to the main contribution mode can assist the viscous damper to suppress the vibration of the main mode to utmost extent; the proposed method can effectively compensate the loss of damping effect of the viscous damper due to cable-girder coupled vibration.
关键词
斜拉桥 /
索－梁耦合振动 /
拉索复合减振 /
理论分析 /
模型试验
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Key words
cable-stayed bridge /
cable-girder coupled vibration /
compound vibration reduction of cable /
theoretical analysis /
test
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