Damping characteristics of friction damped braced frame and its
effectiveness in the mega-sub controlled structure system
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Lian Yeda
(Á¬Òµ´ï)1 , Zhang Xunan
(ÕÅä°²)1 and Sheldon Cherry2
¡¡
1. College of Mechanics and Civil Engineering, Northwestern Polytechnic
University, Xi¡¯an 710072, China
2. Department of Civil Engineering, University of British Columbia, Vancouver,
Canada
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Abstract: Based on energy
dissipation and structural control principle, a new structural configuration,
called the mega-sub controlled structure (MSCS) with friction damped braces (FDBs),
is first presented. Meanwhile, to calculate the damping coefficient in the
slipping state a new analytical method is proposed. The damping characteristics
of one-storey friction damped braced frame (FDBF) are investigated, and the
influence of the structural parameters on the energy dissipation and the
practical engineering design are discussed. The nonlinear dynamic equations and
the analytical model of the MSCS with FDBs are established. Three building
structures with different structural configurations, which were designed with
reference to the conventional mega-sub structures such as used in Tokyo City
Hall, are comparatively investigated. The results illustrate that the structure
presented in the paper has excellent dynamic properties and satisfactory control
effectiveness.
Keywords:friction damped
braces; mega-sub controlled structure; energy dissipation; vibration control;
nonlinear dynamic system
