Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"damping devices"”.
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Investigation of the Use of Viscoelastic Damping Devices to Rehabilitate a Lightly Reinforced Concrete Slab-Column Structure
Interpretations of the testing results are provided through the use of linear models of the type that might be used in the design office. The analytical models were used to assess strength, stiffness, and serviceability of the structure. In addition, the analytical models were used to assess the …
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Evaluation of strategies for seismic design
… and non-structural damage. Seismic isolation and damping devices are currently used in buildings as two innovative performance-based design approaches. This thesis explores the effectiveness and the differences of the two methods in mitigating the motion of buildings when subjected to earthquake …
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Life-Cycle Cost-Based Optimal Seismic Design of Structures with Energy Dissipation Devices
… have investigated the use of energy dissipating damping devices to achieve the performance of a building structure in a desirable manner over all levels of seismic intensity. Since the initial motivation of performance-based design was reducing economic loss, the life-cycle cost-based …
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Dynamic range implications for the effectiveness of semi-active tuned mass dampers
… tuned mass damper (TMD), which acts as a passive damping device in the region of the tuned frequency. However, TMDs exhibit a limited bandwidth and often require a significant mass. Active systems, such as the active mass driver, have been utilized to improve the effectiveness of the TMD concept, …
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Damping acoustic pressure pulsations in pipelines using Helmholtz resonators
… fatigue failure. In this thesis, an acoustic damping device known as the Helmholtz resonator (HR) is experimentally studied. The effects of HR cavity volume, pipeline diameter, HR location, the use of multiple HRs, and mean flow velocity are investigated to determine their effects on the …
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Passive damping mechanism of Herschel-Quincke tubes for pressure pulsations in piping systems
… phenomenon known as acoustic resonance. Passive damping devices such as the Herschel-Quincke (HQ) Tube can be implemented into a resonant system to mitigate the pressure pulsations. Some practical considerations have been clarified in the current work which include the normalization of the …
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Innovative System for Seismic Control Strategies
… alternative approaches, installing auxiliary damping devices such as tuned mass dampers (TMDs) is a very reliable solution to mitigate wind-induced vibration of tall buildings. However, regardless of the different distribution strategies, installing TMD systems means adding additional masses …
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Trends and innovations in high-rise buildings over the past decade
… today's design of high-rise buildings including damping systems, construction techniques, elevator systems as well as sustainability are presented and discussed. To better understand current high-rise buildings, information about buildings above 200 meter completed within recent ten years and the …
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Analytical and Experimental Investigation of the Damping Matrix in Shear Building Models
… a study conducted on investigating the nature of damping matrix associated with multi degree of freedom simple shear building models. The various conventional methods of creating damping matrices in structures are summarized and numerical examples are used to illustrate the inconsistencies among …
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Passive motion control of super tall buildings : tuned mass and viscous dampers in Taipei 101.
… under dynamic excitations is by placing damping devices in the buildings. In this thesis, the design concept, design procedure 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 …
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Heating effects on magnetorheological dampers
… have tried to develop and improve various devices and control systems in order to mitigate and prevent civil structures against external dynamic forces such as strong wind and earthquakes. Indeed, damping devices absorb and dissipate the energy input during an earthquake, for instance and …
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Experimental Investigation and CFD Simulation of Active Damping Mechanism for Propellant Slosh in Spacecraft Launch Systems
… used to mitigate the effects of slosh. An active damping mechanism concept developed here can operate over a large range of slosh frequencies and is much more effective than passive damping devices. Spherical and cylindrical tanks modeled using the ANSYS CFX software package considers the free …
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Seismic design of energy dissipation systems for optimal structural perfromance
… usefulness of supplementary energy dissipation devices is now quite well-known in the earthquake structural engineering community for reducing the earthquake-induced response of structural systems. However, systematic design procedures for optimal sizing and placement of these protective systems …
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Assessment of Foundation Rocking Behavior in Reducing the Seismic Demand on Horizontally Curved Bridges
… capabilities in addition to adding damping to the system provided competent soil condition exist. Previous research conducted experiments on the effect of rocking foundations on column damage through single pier testing without including the system effects.In this study, the system …
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Topology optimization of structures subjected to stochastic dynamic excitation
… optimization of topology and supplemental damping distribution of buildings subjected to stochastic dynamic excitation. The proposed topology optimization framework and its components are illustrated through several numerical examples: application to idealized structures, application to …
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Dynamic Soil-Structure Interaction In Buildings With Oil Dampers
… confines energy dissipation to the supplemental damping devices alone, neglecting any contributions from foundation-soil inertial interaction that may arise in the field. A considerable portion of literature on oil dampers in structures emanates from a mathematical optimisation background, …