Supporting brace sizing in structures with added linear viscous fluid dampers: A filter design solution
Article first published online: 7 MAY 2014
© 2014 The Authors. Earthquake Engineering & Structural Dynamics published by John Wiley & Sons Ltd.
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Earthquake Engineering & Structural Dynamics
Volume 43, Issue 13, pages 1999–2013, 25 October 2014
How to Cite
2014), Supporting brace sizing in structures with added linear viscous fluid dampers: A filter design solution, Earthquake Engng Struct. Dyn., 43, pages 1999–2013, doi: 10.1002/eqe.2433, and (
- Issue published online: 28 SEP 2014
- Article first published online: 7 MAY 2014
- Manuscript Accepted: 24 MAR 2014
- Manuscript Revised: 21 MAR 2014
- Manuscript Received: 5 JUL 2013
- brace stiffness;
- Maxwell model;
- supplemental damping;
- brace–damper systems
Viscous fluid dampers have proved to be effective in suppressing unwanted vibrations in a range of engineering structures. When dampers are fitted in a structure, a brace is typically used to attach them to the main structure. The stiffness of this brace can significantly alter the effectiveness of the damper, and in structures with multiple dampers, this can be a complex scenario to model. In this paper, we demonstrate that the effects of the brace compliance on the damper performance can be modelled by way of a first-order filter. We use this result to formulate a procedure that calculates the stiffness required by the supporting brace to provide a specified effectiveness of the damping action. The proposed procedure assumes that viscous dampers have been sized in a previous design step based on any optimal methodology in which, as is usually the case, the presence of supporting braces and their dynamic effects were neglected. Firstly considering a one degree-of-freedom system, we show that the proposed method ensures a desired level of damper efficiency for all frequencies within a selected bandwidth. Then the analysis is extended to the case of multi-degree-of-freedom systems to show that the design criteria can be applied in a straightforward and successful manner to more complex structures. © 2014 The Authors. Earthquake Engineering & Structural Dynamics published by John Wiley & Sons Ltd.