Global ETD Search
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Showing 1 to 20 of 28 for “"Base isolation"”.
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Base isolation case study
… of the current code, ASCE 7-05 into the base isolation design and the analysis of base isolation response due to seismic forces. An eight story irregular structure is modeled using SAP2000 structural program. The time history of Northridge earthquake is used as a seismic forcing function …
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Study of base isolation systems
… issues concerning the conceptual design of base isolated structures. A 90 feet high, 6 stories tall, moment steel frame structure with tension cross bracing is used to compare the response of both fixed base and base isolated schemes to severe earthquake excitations. Techniques for modeling …
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Base isolation benefits of rocking and uplift
… to use rocking and uplift as a means of base isolation. Previous works on the rocking and uplift problem were conducted primarily to study the criteria of overturning, uplift ratio, maximum displacement, shear force at the base, and motion response of model structures. In most of these …
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Design of base isolation system for buildings
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2001.
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Seismic base isolation : a five-story building example
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1999.
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Applications of force actuators and variable stiffness systems with base isolation
… limit the effectiveness of conventional strength-based structural design. First, there has been a trend towards designing more flexible structures that require increased emphasis on structural motion and serviceability. Next, motion has become more important for the design of new facilities that …
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Influence of base isolation on the response of structures to earthquakes
In this thesis, the seismic analysis of base isolated structures is carried out using a base coordinate relative to the inertial space that renders absolute dynamic response, which is fundamental in assessing base isolation. Moreover, the structure is modeled as an Euler-Bernoulli beam cantilevered …
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Optimization of base isolation systems using low-cost bearings and frictional devices
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2001.
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Multi-resonant Electromagnetic Shunt in Base Isolation for Vibration Damping and Energy Harvesting
… multi-resonant electromagnetic shunt in base isolation. In this research, two multi-resonant shunt configurations, parallel and series, were proposed and optimized based on the H2 criteria when the base isolation system is subjected to ground acceleration excitations. The performance of …
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On the performance of base-isolated buildings: a generic model
… to this increasingly significant problem is the base-isolation of buildings by incorporating vibration isolation bearings between the buildings and their foundations. This technique has been employed for over forty years but the exact performance of base isolation remains uncertain. This …
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Multi-axial Active Isolation for Seismic Protection of Buildings
… of structures against seismic hazards. Passive base isolation is one of the common structural control techniques used to enhance the performance of structures subjected to severe earthquake excitations. Isolation bearings employed at the base of a structure naturally increase its flexibility, …
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Seismic Performance Comparison of a Fixed-Base Versus a Base-Isolated Office Building
<p>The topic of this thesis is base isolation. The purpose of this thesis is to offer a relative understanding of the seismic performance enhancements that a typical 12-story steel office building can achieve through the implementation of base isolation technology. To reach this understanding, the …
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The sustainability of motion control systems
… been identified. Energy dissipation devices and base isolation are two methods that reduce the damage and minimize the response of a structure. Energy dissipation of a structure removes energy and therefore movement from a structure by providing damping. Motion energy is converted to other types …
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Seismic response of transformer bushing systems and their rehabilitation using frictional pendulum system
… a substation, The frictional pendulum system (a base isolation method) is considered for rehabilitation of existing substations or the mitigation of the seismic requirements for new substations. Results of parametric and experimental study are presented. A simplified model of a transformer with …
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Seismic retrofitting of deficient Canadian buildings
… A case study assessing the performance of hybrid base isolation systems is then presented. The performance of passive and semi-active hybrid base isolation system is evaluated through the use of a SIMULINK computer model of a typical two-story concrete frame building. A significant reduction in …
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Optimal design strategies for base-isolated bridges
Base isolation of bridges provides an excellent defense against the damaging effects of earthquakes. For this design strategy, flexible supports are placed between the deck and substructure. This changes the lowest periods of vibration of the bridge and shifts it to a period where little energy is …
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A Study of Neural and Conventional Control Paradigms in Active Digital Control
… chosen for investigation. The first problem is a base isolation system which is an example of rigid body structural control. The second problem involves the reduction of excessive vibrations of a nonlinear (geometrically) cantilevered plate structure which is an example of flexible structural …
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Study of seismic control systems on the behaviour of industrial storage racks
… a pounding tuned mass damper (PTMD) and (ii) a base isolation system. Full scaled shake table testing was performed at the University of Technology, Sydney (UTS) to study the dynamic behaviour of storage racks and to verify the numerical models. As part of the research, numerical models based on …
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Techniques of seismic retrofitting for concrete structures
… addition of shear walls or steel bracings, and base isolation. All three methods are effective. Shear walls are usually an expensive solution but they are flexible in their distribution allowing them to be hidden in the architecture. Steel bracings allow for openings but their connections to the …
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Substructure Synthesis Analysis and Hybrid Control Design for Buildings under Seismic Excitation
… and establish a design methodology for base isolation and active control in a distributed model of a building under seismic excitation. Our objective is to show that passive and active control complement each other in such an advantageous manner for the case at hand, that simple devices …
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