Equivalent Modal Damping Ratios of a Composite Tube-Type Tall Building to Dynamic Wind Loading

Article type: Research Article

Authors: Huang, B.C.^; | Lam, K.M. | Leung, A.Y.T. | Cheung, Y.K.

Affiliations: Department of Engineering Mechanics, Tongji University, Shanghai 20092, China | Department of Civil and Structural Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong

Note: [] A part of this article was presented at the Third Asia-Pacific Symposium on Wind Engineering held in Hong Kong on December 13–15, 1993.

Abstract: This article discusses computing methods of the equivalent modal damping ratio for a composite tube-type tall building. The equivalent damping ratio of a composite structure under wind-induced vibrations encompasses the combined effects from the different values of damping, mass, and stiffness of the external and internal tubes. A detailed method incorporating Rayleigh damping and the transfer matrix method is proposed for the determination of the equivalent modal damping ratio. A simplified method for engineering applications is also proposed. Results for a 40-story building are presented exemplifying the computation and relationships between the properties of the external and internal tubes.

DOI: 10.3233/SAV-1996-3203

Journal: Shock and Vibration, vol. 3, no. 2, pp. 99-105, 1996