Optimal variables of TMDs for multi-mode buffeting control of long-span bridges

S.R. Chen , C.S. Cai , M. Gu , C.C. Changrn

Abstract

In the past decades, much effort has been made towards the study of single-mode-based vibration controls with dynamic energy absorbers such as single or multiple Tuned Mass Dampers(TMDs). With the increase of bridge span length and the tendency of the bridge cross-section being more slender and streamlined, multi-mode coupled vibrations as well as their controls have become very important for large bridges susceptible to strong winds. As a simple but effective device, the TMD system especially the semi-active one has become a promising option for such coupled vibration controls. However, despite various studies of optimal controls of single-mode-based vibrations with TMDs, researchrnon the corresponding controls of the multi-mode coupled vibrations is very rare so far. For the development of a semi-active control strategy to suppress the multi-mode coupled vibrations, a comprehensive parametric analysis on the optimal variables of this control is substantial. In the present study, a multi-mode controlrnstrategy named

Key Words

buffeting; tuned mass damper; mode coupling; long-span bridge; control.

Address

S.R. Chen and C.S. CairnDepartment of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, USArnM. GurnDepartment of Bridge Engineering, Tongji University, Shanghai 200092, ChinarnC.C. ChangrnDepartment of Civil Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong

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