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 20 of 32 for “"seismic isolation"”.
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Seismic isolation of bridges
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2000.
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Seismic isolation of buildings for vertical earthquake excitations
This thesis concerns a seismic isolation mechanism for vertical component of earthquake. The vertical component of earthquake can be stronger and more destructive than the horizontal component in near-fault areas, for instance, Christchurch earthquake in New Zealand in 2011 or Bam earthquake in …
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Fundamental Dynamics and Performance Assessment of Three-Dimensional Seismic Isolation
Seismic isolation is an effective technique used to mitigate effects of ground shaking and achieve higher seismic performance in building structures. Recent research has suggested that vertical excitation has significant effects on the structural response during an earthquake. In this dissertation, …
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The installation of a seismic isolation system for building retrofit
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2001.
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Application of seismic isolation as a performance-based earthquake-resistant design method
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1995.
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Development of a Novel Controllable Seismic Isolation System Based on Negative Stiffness Concept
… the challenges underwent by traditional adaptive seismic negative stiffness devices (ASNSDs) and other base isolators to contribute new knowledge to the seismic protection field. Firstly, the beneficial effects of nonlinear damping and stiffness on seismic protection are investigated in the form …
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An investigation of the principles and practices of seismic isolation in bridge structures
Within the past decade, seismic isolation systems have gained rapid popularity in the earthquake resistant design of bridge structures. This popularity has come in response to the inadequacy of earlier seismic design and retrofit methodologies. The mechanical shortcomings and subsequent failure …
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Improved seismic isolation for the Laser Interferometer Gravitational Wave Observatory with hydraulic external pre-isolator system
… which in most cases is predominated by seismic noise. We examined the recent seismic noise records at LLO and LHO, and found the seismic noise at both sites had decreased from Oct. 1, 2003 to Oct. 1, 2006. No long term trend can be derived from the there-year data studied, however it is …
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Rolling-Ball Rubber-Layer system for the lightweight structures seismic protection: experimentation and numerical analyses
Protection of high-value building contents from seismic damage represents a worldwide challenging task. Artefacts, sophisticated medical and electrical equipment, high performance computer installations and other special contents have shown, in the last years, their high vulnerability both for high …
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Experimental testing of LIGO vibration isolation system
… sensitivity will be achieved in part by improved seismic isolation one component of which is an active vibration isolation platform. Currently, research and development is being conducted at MIT on a prototype of this vibration isolation system. The work described in this thesis focuses on the …
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Adjustable Frequency Bandgap for Seismic Vibration Isolation of MRE-Based Metamaterial Foundations
… eventually damaging the superstructure. These seismic waves are more frequent in some areas because of their geological variations. The seismic vibration caused by earthquakes can damage the structure, leaving it unrectifiable and unusable. Different types of seismic isolation are used …
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Design methodologies for controlling vibrations in buildings
… Their applications range from acoustic to seismic isolation of structures. Virtually any vibration magnitude can be prevented from degrading the performance of a structure. This thesis is intended to provide a practical introduction to the design and suitability of vibration isolators for …
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Evaluation of strategies for seismic design
Current trends in seismic design require a new approach, oriented in satisfying motion related design requirements and limiting both structural and non-structural damage. Seismic isolation and damping devices are currently used in buildings as two innovative performance-based design approaches. …
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The development of a selection criteria model for the type of seismic retrofitting scheme applicable to Philippine buildings
… Pacific "Ring of Fire" and it is one of the most seismically active and disaster prone areas in the world. In the Philippines, where a percentage of the buildings are structurally out of date, seismic retrofitting is of utmost importance. This study presents an overview of various rehabilitation …
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Active wavefront correction in laser interferometric gravitational wave detectors
… suspensions and test mass substrates, active seismic isolation, and higher input laser power. Even with the highest quality optics available today, however, finite absorption of laser power within transmissive optics, coupled with the tremendous amount of optical power circulating in various …
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Seismic Analysis and Response of Highway Bridges with Hybrid Isolation
AbstractIn this study hybrid isolation is proposed as an alternative to (full) seismic isolation for minimizing bridge damage in strong earthquakes. In this technique isolators are only used at the abutments, and monolithic or pinned connections remain at the piers. Both full and hybrid isolation …
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Design of passive decay heat removal system for the lead cooled flexible conversion ratio fast reactor
… the vessel, and the dynamic stress caused by a seismic event. The static stress was found to be within ASME code limits. Seismic analysis determined that a seismic isolation scheme would be necessary in order to prevent damage to the vessel during an earthquake.
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Characterization of an advanced LIGO quadruple pendulum system
… At low frequencies, typically below 30 Hz, seismic noise is the dominant noise source that limits the sensitivity with which GW-induced mirror displacements can be measured. To shield the mirrors from the seismically driven motion of the ground, they are suspended from pendula which are in …
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Modal control with state estimation for advanced LIGO quadruple suspensions
… is a chain of four masses used to provide seismic isolation of the mirrors at the level of 10-19 m Hz-1/2 at 10 Hz. Because the pendulum is so quiet above 10 Hz, the sensor noise used in the active control is not trivial. Thus, the purpose of this research is to optimize a control scheme …
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