Study on Dynamics and Control of Structures with Identical Structural Members

本研究的主要目的是讨论具有多个相同杆件的结构的动力特性和被动控制，同时考虑子结构的耦合。本研究的内容概括如下：1.研究内容。子结构耦合振动控制：采用解析和实验相结合的方法，对两个相同的T型台二次拉索系统的索系模型进行了研究。得出结论：1.通过子结构间的内共振，可以提高系统的模态阻尼。悬索桥平行吊杆的动力学分析：从子结构耦合的角度进行复特征值分析，验证了粘滞阻尼器对平行吊索风振的减振效果。输电线路系统舞动分析：对多跨输电线路进行舞动分析，探讨分跨耦合舞动的可能性和选型。还讨论了由于子跨长度的微小差异而引起的模式局部化问题。高架桥地震振动中的子结构行为。通过对整体模型和子结构模型进行特征值分析和非线性动力响应分析，讨论了子结构响应对整体系统响应的影响。斜拉桥耦合拉索振动的减振效应：对塔塔拉大桥进行了基于子结构法的减振分析。结果表明，斜拉索耦合振动能有效地降低斜拉桥的振型阻尼。

The main objective of this study is to discuss the dynamic characteristics and passive control of structures with several numbers of identical members paying attention to sub-structural coupling. The contents of the present study are summarized as follows.1. Vibration control by sub-structural coupling : A cable system model for two identical catwalk system with a secondary cable was studied analytically and experimentally. It is concluded that the modal damping of system can be made higher by means of internal resonance among substructures.2. Dynamics of parallel hangers in suspension bridge : The effectiveness of a viscous damper for reducing wind-induced oscillations of parallel hangers was checked by conducting the complex eigenvalue analysis from the viewpoint of sub-structural coupling.3. Galloping analysis of transmission line system : The galloping analysis of multi-span transmission line was conducted to investigate the possibility of sub-span-coupled galloping and the model selection. The mode localization due to slight difference in sub-span length was also discussed.4. Sub-structural behavior in earthquake-induced oscillations of viaduct. The effect of sub-structural response on the global system response was discussed by conducting the eigenvalue analysis and the nonlinear dynamic response analysis for both global model and sub-structural model.5. Damping effect of coupled cable oscillation in cable-stayed bridge : The damping analysis based on the sub-structural method was conducted for the Tatara Bridge. It is concluded that the coupled cable oscillation can reduced the modal damping of cable-stayed bridges.