2009•Journal of Shenyang Jianzhu UniversityRequires access

Study on 3D Steel Frame Structure with Complex Damping Theory

Chengqiang Zhao

Abstract

The current damping models can not describe damping characteristics in detail.In order to direct project work,the complex damping dynamic system and the dynamic response of 3D steel frame structure are studied.The harmonic response of the structure and loss factor are analyzed with complex damping model,and the results of complex damping model are compared with that of Rayleigh damping model.It shows that there are not much difference between two kinds of response under non-resonance case;but much difference between two kinds of response from Rayleigh and stress-related complex damping model under resonance case.The latter's response is much bigger than the former's,and the phase difference exists between the two.It also shows that the loss factor is not a constant and its amplitude increases with excitation amplitude.Different damping models in mechanism have big effect on the structure dynamic response in precision.

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Key concepts: Damping ratio, Thermoelastic damping, Amplitude, Structural engineering, Rayleigh scattering, Harmonic, Excitation, Resonance (particle physics)