Author: Nijo Abraham
Publisher:
ISBN:
Category :
Languages : en
Pages : 115
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Book Description
Seismic isolation is one of the earthquake protective technologies used for buildings, bridges and other structures as well as non-structural components. Among the seismic isolation technologies, the newly developed roller bearing system ensures constant and low acceleration of superstructure and regulates bearing displacement. However, due to the limited contact area, to withstand large vertical force, the size of rollers must be large. To overcome this problem, a special slider will be used in this thesis to replace the roller. This slider bearing will have the identical dynamic behavior as the roller bearing and will support considerably large weight. The sliding surface is combined with two different materials with different friction coefficient, so that the slider bearing can provide a desirable friction coefficient to dissipate seismic energy while minimizing bearing displacement. This thesis comprises both computational and experimental studies to examine the mechanical performance, along with an experimental study to analyze the uni-directional thermo-mechanical performance of this slider bearing system. The experiments are performed using a shaker table in the Structural Engineering and Earthquake Simulation Laboratory (SEESL), University at Buffalo. Four slider bearings are used to support a concrete mass as a superstructure on the table. Selected earthquake records are used as ground excitations. Accelerations of the table and superstructure were measured along with relative displacements between the table and superstructure. Both the theoretical and experimental studies presented here show great potential of this slider bearing system. The dynamic performance of this seismic isolation slider bearing is virtually identical to the roller bearing, ensuring low level of accelerations and minimum relative displacement. Moreover the slider itself can support more vertical loads with limited working areas.
Author: James M. Kelly
Publisher: John Wiley & Sons
ISBN: 1119972809
Category : Technology & Engineering
Languages : en
Pages : 217
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Book Description
Widely used in civil, mechanical and automotive engineering since the early 1980s, multilayer rubber bearings have been used as seismic isolation devices for buildings in highly seismic areas in many countries. Their appeal in these applications comes from their ability to provide a component with high stiffness in one direction with high flexibility in one or more orthogonal directions. This combination of vertical stiffness with horizontal flexibility, achieved by reinforcing the rubber by thin steel shims perpendicular to the vertical load, enables them to be used as seismic and vibration isolators for machinery, buildings and bridges. Mechanics of Rubber Bearings for Seismic and Vibration Isolation collates the most important information on the mechanics of multilayer rubber bearings. It explores a unique and comprehensive combination of relevant topics, covering all prerequisite fundamental theory and providing a number of closed-form solutions to various boundary value problems as well as a comprehensive historical overview on the use of isolation. Many of the results presented in the book are new and are essential for a proper understanding of the behavior of these bearings and for the design and analysis of vibration or seismic isolation systems. The advantages afforded by adopting these natural rubber systems is clearly explained to designers and users of this technology, bringing into focus the design and specification of bearings for buildings, bridges and industrial structures. This comprehensive book: includes state of the art, as yet unpublished research along with all required fundamental concepts; is authored by world-leading experts with over 40 years of combined experience on seismic isolation and the behavior of multilayer rubber bearings; is accompanied by a website at www.wiley.com/go/kelly The concise approach of Mechanics of Rubber Bearings for Seismic and Vibration Isolation forms an invaluable resource for graduate students and researchers/practitioners in structural and mechanical engineering departments, in particular those working in seismic and vibration isolation.
Author: Daniel M. Fenz
Publisher:
ISBN:
Category : Bearings (Machinery)
Languages : en
Pages : 190
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Book Description
Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 190
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Book Description
Author: Daniel M. Fenz
Publisher:
ISBN:
Category : Bearings (Machinery)
Languages : en
Pages : 279
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Book Description
Author: Kasey Ketterling
Publisher:
ISBN:
Category : Base isolation
Languages : en
Pages : 206
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Book Description
Dynamic and static tests were performed on hollow-core seismic base isolation bearings constructed from crumb-rubber composite from recycled tires to determine if the behavior of bearings from this new material performed according to existing theory. The effects of weight, height, acceleration, particle shape, and intermittent plates were analyzed to develop trends in the behavior of bearings. Crumb rubber from recycled tires had not been previously considered as a structural material, necessitating a thorough material classification. In the horizontal direction under dynamic loading, the bearings performed according to theory, with minimal error likely due to material inconsistencies. The behavior in the vertical direction was less predictable. Taller bearings were considered for this testing then recommended by current practice, with the introduction of non-linear effects, such as bending and non-parabolic deformation under vertical loading. The results obtained will be useful in making advancements towards using crumb-rubber composite from recycled tires in seismic base isolation bearings in residential construction.
Author: C. J. Derham
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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Book Description
Author:
Publisher: AASHTO
ISBN: 1560514566
Category : Technology & Engineering
Languages : en
Pages : 63
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Book Description
This edition is based on the work of NCHRP project 20-7, task 262 and updates the 2nd (1999) edition -- P. ix.
Author: U.S. Nuclear Regulatory Commission
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 48
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Book Description
Author: The Japan Society of Seismic Isolation
Publisher: 日本免震構造協会
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 138
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Book Description
※この商品はタブレットなど大きいディスプレイを備えた端末で読むことに適しています。また、文字だけを拡大することや、文字列のハイライト、検索、辞書の参照、引用などの機能が使用できません。 This book was compiled with the aim of providing reference materials specific to architectural designers (architects and designers) in order to promote further technical improvement and development of seismic isolation buildings. “How has seismic isolation architecture solved the diverse demands and complex problems faced by architecture?” “What are the points of seismic isolation architecture design?” “By dissecting seismic isolation architecture, you can feel more familiar with seismic isolation architecture”. The editorial theme was based on the historical background, such as “Sharing accumulated seismic isolation technology”. Preparations are being made not only by building owners and governments planning projects, but also in economic, cultural, medical, welfare, production, logistics, academic, and other fields where natural disasters occur frequently, and are preparing for major earthquakes that are sure to repeat in the future. This book aims to remove obstacles when considering the introduction of seismically isolated buildings. We hope that this book will be used as a guidebook to protect valuable social capital and illuminate the path to seismically isolated construction.
