NEW CONTROL MECHANISM OF TUNED MASS DAMPER FOR STRONG WIND-INDUCED COUPLED VIBRATION OF LONG-SPAN BRIDGES IN HURRICANE PRONE AREA

Abstract eng:
Tuned Mass Damper (TMD) is a well-known control device often used in dynamic vibration control of mechanical and civil structures. In the past decades, the control mechanism of TMD has been well studied for both Single Degree Of Freedom (SDOF) structures and Multiple Degree Of Freedom (MDOF) structures with weak modal coupling. With the increase of bridge span lengths and the tendency of bridge cross-section being more slender and streamlined, the vibration modes of bridges are more prone to couple together due to the interaction between the bridge and wind. The objective of this study is to develop a control mechanism that will be efficient not only for the control of resonant vibration, but also for controlling the vibration due to modal coupling. For this purpose, a theoretical derivation of coupled buffeting response of a bridge-TMD system is made. With the derived analytical formulation, control theory of TMD on coupled vibration is analytically and numerically investigated. It is found that TMD can suppress the coupled response through reducing the modal coupling effects, in addition to traditionally suppressing the resonant response. Such methodology is demonstrated and confirmed through an example.

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