Seismic Behavior of Wood-framed Structures with Viscous Fluid Dampers

2004 ◽  
Vol 20 (2) ◽  
pp. 451-482 ◽  
Author(s):  
Michael D. Symans ◽  
William F. Cofer ◽  
Ying Du ◽  
Kenneth J. Fridley
Keyword(s):  
Viscous Fluid ◽  
Energy Demand ◽  
Three Dimensional ◽  
Inelastic Strain ◽  
Numerical Analyses ◽  
Seismic Protection ◽  
Framed Structures ◽  
Building Components ◽  
Fluid Dampers ◽  
Viscous Fluid Dampers

The suitability of viscous fluid dampers for seismic protection of light-framed wood buildings is investigated in this paper. Nonlinear finite-element models of wood building components (shear wall) and systems (three-dimensional buildings) are developed and numerical analyses are performed to evaluate their response to seismic loading. For both the single wall and the building system, seismic protection is provided by installing viscous fluid dampers within the wall cavities. The results of the numerical analyses demonstrate the ability of fluid dampers to dissipate a significant portion of seismic input energy, reducing the inelastic strain energy demand on the wood framing system. In addition, the study revealed some important practical issues associated with implementation of fluid dampers within light wood-framed buildings.

Research on Seismic Response Vibration Hybrid Control of Hefei TV Tower

2011 ◽  
Vol 243-249 ◽  
pp. 5197-5203
Author(s):  
Zhi Qiang Zhang ◽  
Fei Ma
Keyword(s):  
Viscous Fluid ◽  
Seismic Response ◽  
Control Method ◽  
Hybrid Control ◽  
Spectral Characteristics ◽  
Vibration Reduction ◽  
Tuned Mass Damper ◽  
Mass Damper ◽  
Fluid Dampers ◽  
Viscous Fluid Dampers

In this paper, Hefei TV Tower is used as an analytical case to examine the Hybrid control method on seismic response. Firstly, on the basis of the other’s work, a bi-model dynamic model is proposed to study the seismic response vibration hybrid control, using tuned mass damper and viscous fluid dampers. Then the optimal coefficient is obtained by considered the seismic response of upper turret as optimization objectives. According to analysis, it’s showed that the seismic responses of the tower are decreased greatly with tuned mass damper and viscous fluid dampers, and the vibration reduction effectiveness of the tower is sensitive to the spectral characteristics of earthquake wave.

scholarly journals Passive Control System for Mitigation of Longitudinal Buffeting Responses of a Six-Tower Cable-Stayed Bridge

2016 ◽  
Vol 2016 ◽  
pp. 1-18 ◽  
Author(s):  
Fangfang Geng ◽  
Youliang Ding ◽  
Aiqun Li
Keyword(s):  
Viscous Fluid ◽  
Optimization Design ◽  
Passive Control ◽  
Bridge Deck ◽  
Design Method ◽  
Nsga Ii ◽  
Cable Stayed Bridge ◽  
Base Forces ◽  
Fluid Dampers ◽  
Viscous Fluid Dampers

This paper presents an investigation of mitigation of longitudinal buffeting responses of the Jiashao Bridge, the longest multispan cable-stayed bridge in the world. A time-domain procedure for analyzing buffeting responses of the bridge is implemented in ANSYS with the aeroelastic effect included. The characteristics of longitudinal buffeting responses of the six-tower cable-stayed bridge are studied in some detail, focusing on the effects of insufficient longitudinal stiffness of central towers and partially longitudinal constraints between the bridge deck and part of bridge towers. The effectiveness of viscous fluid dampers on the mitigation of longitudinal buffeting responses of the bridge is further investigated and a multiobjective optimization design method that uses a nondominating sort genetic algorithm II (NSGA-II) is used to optimize parameters of the viscous fluid dampers. The results of the parametric investigations show that, by appropriate use of viscous fluid dampers, the top displacements of central towers and base forces of bridge towers longitudinally restricted with the bridge deck can be reduced significantly, with hampering the significant gain achieved in the base forces of bridge towers longitudinally unrestricted with the bridge deck. And the optimized parameters for the viscous fluid dampers can be determined from Pareto-optimal fronts using the NSGA-II that can satisfy the desired performance requirements.

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