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Showing 1 to 16 of 16 for “"viscous dampers"”.
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Viscous Dampers for Optimal Reduction in Seismic Response
… in vibrating civil structures, existence of viscous damping is commonly assumed primarily for mathematical convenience. In such a classical damper, the damping force is assumed to depend only on the velocity of deformation. Fluid viscous dampers that provide this type of damping have been …
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Viscous dampers : practical application issues for the structural engineer
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.
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Passive motion control of super tall buildings : tuned mass and viscous dampers in Taipei 101.
… and some current applications of tuned mass and viscous dampers are discussed. Taipei101 was used as an example to compare the performance of the two damping schemes. It was modeled in a two-dimensional scheme in SAP2000 and a TMD was placed on its top to study its effect on the structural …
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Use of Incremental Dynamic Analysis to Assess the Performance of Steel Moment-Resisting Frames with Fluid Viscous Dampers
… of steel moment-resisting frames with fluid viscous dampers subjected to earthquake ground motions. The study systematically investigated the effects of linear and nonlinear dampers on the response of steel moment-resisting frames to earthquakes that varied in intensity and type. Both …
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Development of advanced modal methods for calculating transient thermal and structural response
… spring-mass system with discrete viscous dampers subjected to a sinusoidally varying load and a multispan beam with discrete viscous dampers subjected to a uniform, quintic time varying load. The last example studied is a transient thermal problem of a rod subjected to a …
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Case study of a 39-story building : model verification and performance comparison with a semi-active device
Implementing viscous dampers in high-rise buildings has proven to be an efficient structural way to control interstory drift and accelerations in buildings undergoing wind and earthquake excitations. However, the cost of this implementation sometimes turns to be prohibitive or too high. As a …
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Application of damping in high-rise buildings
… this thesis is to research the incorporation of viscous dampers into the outrigger system to improve the dynamic performance. This study will be conducted on a typical high-rise structure in Boston, MA in attempt to find realistic results. This thesis will utilize two analysis models for the …
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Frequency-based response of damped outrigger systems for tall buildings
… describes the concept of incorporating fluid viscous dampers in the outrigger system to add supplementary damping into the structure. A 40-story building installed with the variant outrigger system is analyzed for dynamic response due to wind effects such as buffeting and vortex shedding. By …
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Sulla progettazione in zona sismica di strutture dotate di dissipatori fluido-viscosi: proposta di una metodologia
CHAPTER 1:FLUID-VISCOUS DAMPERS In this chapter the fluid-viscous dampers are introduced. The first section is focused on the technical characteristics of these devices, their mechanical behavior and the latest evolution of the technology whose they are equipped. In the second section we report the …
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Optimal damping for a suspended structure under lateral loading
… suspended structure and sizes for the required viscous dampers. The building is analyzed both statically and dynamically to withstand lateral loading in excess of what is associated with Eastern Massachusetts. 3-dimensional computer models that were utilized to approximate the behavior of the …
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Performance evaluation of innovative toggle brace damper for flexible structure seismic upgrade
Amplifying the motion of viscous dampers has been recognized as an effective solution to mitigate structural response to wind and seismic excitation. Motion amplification devices are designed to amplify a small interstory drift to intensify the stroke of the dampers attached. The efficiency of such …
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Seismic performance assessment for structural optimization
… An application to the placement and sizing of viscous dampers in building frames is presented. A first procedure seeks the optimal trade-off between the investment in damping and the losses due to future earthquakes. For each level of damping considered, another optimization problem is solved …
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Modelling and Simulation of the Nonlinear Dynamics of Arrays of Coupled Filaments for Robot Walkers
… is achieved through elastic springs and linear viscous dampers, creating a lumped-parameter model of the coupling base. The governing equations for the system are derived using Euler-Lagrange's formalism. In simulations, our primary objective is to examine coordinated patterns under diverse …
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Life-Cycle Cost-Based Optimal Seismic Design of Structures with Energy Dissipation Devices
… types of devices are used in this study: fluid viscous dampers, solid visco-elastic dampers, and yielding metallic dampers. The combinations of two different types of dampers are also examined in this study. The genetic algorithm (GA) approach is adopted as an optimizer that searches for the …
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Seismic Performance of Rail-Counterweight System of Elevator in Buildings
… damping of the system using additional discrete viscous dampers. However, there is not much space available for installing the devices, and placement parallel to the spring at the roller guide assemblies is not quite effective due to contact between the restraining plate at the roller guide …
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Effect of Viscous Fluid Dampers on Steel Moment Frame Designed for Strength and Hybrid Steel Moment Frame Design
… research is to investigate the effect of added viscous fluid dampers on a nine story special steel moment frame designed for strength in Seattle. At the initial stages of the work, knowing the fact that moment frames are almost always controlled by drift, it was thought that two different moment …