DOCSLIB.ORG

Earthquakes: Isolation, Energy Dissipation and Control of Vibrations

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Earthquakes: Isolation, Energy Dissipation and Control of Vibrations IAEA-TECDOC-819 Earthquakes: Isolation, energy dissipation and control vibrationsof structuresof for nuclear industrialand facilities and buildings Overview of lectures and papers of a seminar organized jointly withthe Italian Working Group on Seismic Isolation (GLIS) held Capri,and in Italy, 23-25 August 1993 INTERNATIONAL ATOMIC ENERGY AGENCY The IAEA doe t normallsno y maintain stock f reportsso thin i s series. However, microfiche copies of these reports can be obtained from IN IS Clearinghouse International Atomic Energy Agency Wagramerstrasse 5 0 10 P.Ox Bo . A-1400 Vienna, Austria Orders should be accompanied by prepayment of Austrian Schillings 100,- in the form of a cheque or in the form of IAEA microfiche service coupons orderee whicb y hdma separatel ClearinghouseS y MI froI e mth . The originating Section of this publication in the IAEA was: Nuclear Power Technology Development Section International Atomic Energy Agency Wagramerstrasse 5 P.O. Box 100 A-1400 Vienna, Austria EARTHQUAKES: ISOLATION, ENERGY DISSIPATION AND CONTROL OF VIBRATIONS OF STRUCTURE NUCLEAR SFO INDUSTRIAD RAN L FACILITIE BUILDINGD SAN S IAEA, VIENNA, 1995 IAEA-TECDOC-819 ISSN 1011-4289 © IAEA, 1995 Printe IAEe th AustriAn i y d b a September 1995 FOREWORD Seismic isolation is one of the most significant seismic engineering developments in recent years. Researc developmentd han , together with application experienc especialle— y for numerous isolated civil structures alst existinr bu ,o fo g nuclear reactor facilitiesd san d ha , already shown in past years that this technique is extremely promising for a wide range of uses in the industrial field, in particular for advanced nuclear plants. The development and applicatio furthef no r innovative technique suc s— passivs ha e energy dissipation, provisional restraints activd an , e contro f vibrationo l alss begus ha o ha d shownsan — n great potential for reducing seismic or other dynamic loads acting on structures. The International Seminar on Isolation, Energy Dissipation and Control of Vibrations of Structures provide opportunitn da exchange th r yfo updatef eo detailed dan d information e state-of-the-aronth i thesh t e technologies seminae Th . r addresse developmene dth d an t applicatio f innovativno e techniques that have been develope abatemene th r dfo f seismio t c vibrations of structures. In addition to base isolation techniques which have been accepted for construction in some countries, the topics covered by the seminar were floor isolation, passive energy dissipation and active control of vibrations. The seminar was held following recommendatioe th Internationae th f no l Working Grou Fasn po t Reactor 26ts it t hsa Annual Meeting which was held in Vienna, Austria, from 4 to 7 May 1993. This report summarize e contributionth s e seminath o t s r together wite maith h n technical issues and conclusions. Particular attention is paid to contributions which provided new or updated information with respect to that given at the IAEA Specialists Meeting on Seismic Isolation Technology, held at San Jose (California, USA), 18-20 March 1992. Attention is also paid to the development and implementation of more recent but very promising innovative technique reductioe th r sfo f seismino othed can r dynamic loads. e repor bees Th ha tn prepare . MartellA y db i (Working Grou Seismin po c Isolation (GLIS) ENEA, Italy) with the co-operation of M. Forni (GLIS, ENEA, Italy) and A.L. Materazzi and A. Parducci (GLIS and University of Perugia, Italy). A. Rinejski of the IAEA was responsible for the final drafting of the document. EDITORIAL NOTE In preparing this publication for press, staff of the IAEA have made up the pages from the original manuscript views (s).The expressed necessarilynot do reflect those governments ofthe ofthe nominating Member States or of the nominating organizations. Throughout the text names of Member States are retained as they were when the text was compiled. Theof use particular designations countriesof territoriesor does imply judgementnot any by the publisher, the IAEA, as to the legal status of such countries or territories, of their authorities and institutions or of the delimitation of their boundaries. The mention of names of specific companies or products (whether or not indicated as registered) does not imply any intention to infringe proprietary rights, nor should it be construed as an endorsement recommendationor partthe IAEA. ofon the CONTENTS SUMMARY OF THE SEMINAR ............................... 7 1. OVERVIEW OF LECTURES AND PAPERS PRESENTED AT THE SEMINAR ........................................... 10 1.1. Technical sessio isolation o n1 civif no l building bridged san s from seismic and non-seismic vibrations ..............................0 1 . 1.2. Technical session 2 on isolation of civil buildings and bridges from seismic and non-seismic vibrations ............................... 13 1.3. Panel sessio shorn o n1 t presentation discussiod san futurn no e prospects for the extension of applications of seismic isolation techniques to civil building bridged an s s .............................5 1 . 1.4. Technical session 3 on seismic isolation of nuclear facilities ........... 17 1.5. Technical session 4 on seismic isolation of non-nuclear industrial facilities . 18 1.6. Panel sessio shorn o n2 t presentation discussiod san futurn no e prospects for the extension of applications of seismic isolation to nuclear and non-nuclear industrial facilities ...........................0 2 . 1.7. Technical session 5 on passive energy dissipation and active control of vibrations of structures ................................. 23 1.8. Technical sessio passivn o n6 e energy dissipatio activd nan e controf o l vibration structuref so s ................................5 2 . 1.9. Panel sessio shorn o n3 t presentation discussiod san design no n guidelines and codes & standards on seismic isolation and passive energy dissipation ..............................7 2 . 2. APPLICATIONS OF THE INNOVATIVE ANTISEISMIC TECHNIQUES .... 29 2.1. Bridge viaductd san s .................................9 2 . 2.2. Civil buildings .....................................1 3 . 2.3. Non-nuclear industrial structures ........................... 33 2.4. Nuclear structures ................ ...:................ 35 2.5. Applicatio passivf no e energy dissipatio oleodynamid nan c systems .....6 3 . 2.5.1. Civil buildings ................................6 3 . 2.5.2. Industrial structures .............................. 37 . REMARK3 DESIGN SO N GUIDELINES, CODE STANDARDD SAN S .....7 3 . REFERENCES ..........................................9 3 . ABBREVIATIONS ........................................ 43 SUMMAR SEMINAE TH F YO R INTRODUCTION Accordin seminae th o gt r purposes, presente Caprt da i were overview activitiee th n so s progresn i futurd san e programmes state-of-the-are th , applicationf o t designsd san , coded san standards, research and development and observations of behaviours of structures under actual dynamic loads exhibition A . n concerning innovative antiseismic devices developed dan applie Italheln s di parallen yd wa i seminar e th organizes o t lwa t i ; ACEDIy db lasted San d whole th e duratio seminare th f no . The countries and international organizations which participated in the seminar were Brazil, Bulgaria, Canada, Chile, China, France, Germany, Greece, India, Italy, Japan, Mexico Zealandw Ne , , Portugal, Republi Koreaf co , Russian Federation, South Africa, USA, and the International Atomic Energy Agency and Commission of the European Communities. 138 participants took part in the seminar. SEMINAR SESSIONS The seminar consisted of six Technical Sessions (TS), four Panel Sessions (PS) and one Video Presentation Session. Two Technical Sessions (TS 1 and TS 2) and the following Panel Sessio) mainl1 S ny(P dealt with isolatio f industriano l building bridged an s s from seismic and non-seismic vibrations Technicae on ; devotes lwa Sessio) seismi3 o dt S n(T c isolation of nuclear facilities and one (TS 4) to seismic isolation of non-nuclear industrial structures, together wit Panee hon l Sessio regardin) 2 S n(P g both items Technicao tw ; l Session5 S s(T and TS 6) dealt with passive energy dissipation and active/hybrid control; finally, one Panel devotes wa Sessio genera ) o desigt o 3 d t ) S 4 n(P nS l conclusionsguideline(P e on d san . DISCUSSION CONCLUSIOND SAN S Seismic isolation of civil structures: The full maturity of seismic isolation for applications to both new and existing civil constructions (bridges, viaducts and buildings) was confirmed. Most experts agreed that the studies performed and large number of ascertained applications existin severan gi l countries (mor bridgeo et tha 0 viaductd n15 san mord san e than 380 to buildings) have already provided all the necessary information on isolators and isolation systems, thus, that it is now necessary to proceed to an extensive application, to bridges, viaducts and important buildings at least. n particularI o ,mor n ther e ar edoubt s abou e sufficienth t t durabilit f rubbeo y r isolators, which was a major concern until recently. Indeed, both accelerated aging tests performed in various countries and tests on naturally aged bearings confirmed that rubber bearing lifetime of at least 60 to 80 years may be assured, which is not shorter than the usual lifetim f structureeo s (Japanese accelerated aging tests showed that bearings should maintain acceptable characteristics even for more than 100 years). According
Load more

Recommended publications
  • Active Vibration Isolation Technology
    COMPENDIUM Principles of Halcyonics Active Vibration Isolation Technology INTRODUCTION Vibrations accompany us everywhere and, in most cases, these vibrations are undesirable. Such disturbances can be caused by traffic, motors and machine tools, oil and gas platforms, buildings and other construction in seismic zones, undesirable locations of laboratory tables and experimental setups, etc. Modern technologies, e.g. in the area of high-resolution measurements, high-precision manufacturing processes, and super lightweight constructions, require effective anti-vibration solutions to achieve maximum performance. In all these cases, objects require isolation from the sources of vibration. This is particularly true for experiments or processes where the typical amplitudes of the ambient vibration and the dimensions of investigated or manufactured structures fall in the same range. Despite of all the constructional differences, the essence of vibration Figure 1: Comparison of passive and active damping systems. isolation systems is identical. The passive vibration isolation system The comparison reveals the complete absence of resonance in the active damping treatment. consists of a spring and damper (dash-pot). The spring is intended to soften vibrations and disturbances, and the damper has to terminate the oscillation which is amplified within the system. The combination of a mass and the spring is known as a mechanical low-pass. The mechanical response of the spring-mass system decreases significantly for frequencies above the resonance frequency, and the damper reduces the vibration amplitude especially within the resonance range. Because of the low-pass characteristic, passive damping systems are designed with very low resonance frequencies. Since pneumatic springs are characterized by low stiffness and high damping, most anti-vibration mountings available are pneumatic systems.
    [Show full text]
  • Earthquake Resistant Construction Using Base Isolation [Shin Kenchiku Kozo Gijutsu Kenkyu Iin-Kai Hokokusho]
    PB92-189562 NIST Special Publication 832, Volume 1 Earthquake Resistant Construction Using Base Isolation [Shin kenchiku kozo gijutsu kenkyu iin-kai hokokusho] Earthquake Protection in Buildings Through Base Isolation United States Department of Commerce Technology Administration National Institute of Standards and Technology REPRODUCED BY U.S. DEPARTMENT OF COMMERCE NATIONAL TECHNICAL INFORMATION SERVICE SPRINGFIELD, VA. 22161 "J1e National Institute of Standards and Technology was established in 1988 by Congress to "assist ~ ;~dustry in the development of technology ... needed to improve product quality, to modernize manufacturing processes, to ensure product reliability ... and to facilitate rapid commercialization ... of products based on new scientific discoveries." NIST, originally founded as the National Bureau of Standards in 1901, works to strengthen U.S. industry's competitiveness; advance science and engineering; and improve public health, safety, and the environment. One of the agency's basic functions is to develop, maintain, and retain custody of the national standards of measurement, and provide the means and methods for comparing standards used in science, engineering, manufacturing, commerce" industry, and education with the standards adopted or recognized by the Federal Government. As an agency of the U.S. Commerce Department's Technology Administration, NIST conducts basic and applied research in the physical sciences and engineering and performs related services. The Institute does generic and precompetitive work on
    [Show full text]
  • Preview Feedforward Control for Active Vibration Damping of a Hybrid Suspension System
    Technische Universität München Fakultät für Maschinenwesen Preview Feedforward Control for Active Vibration Damping of a Hybrid Suspension System Johannes N. Strohm Vollständiger Abdruck der von der Fakultät für Maschinenwesen der Technischen Universität München zur Erlangung des akademischen Grades eines Doktor-Ingenieurs genehmigten Dissertation. Vorsitzender: Prof. Dr. phil. Klaus Bengler Prüfer der Dissertation: 1. Prof. Dr.-Ing. habil. Boris Lohmann 2. Prof. Dr.-Ing. Ansgar Trächtler Die Dissertation wurde am 06.04.2020 bei der Technischen Universität München eingereicht und durch die Fakultät für Maschinenwesen am 10.11.2020 angenommen. “So ist die den Akt der Objektivierung abschließende Regelungstechnik die methodis- che Vollendung der Technik.” Denkschrift zur Gründung eines Insitutes für Regelungstechnik, Prof. Dr. Phil. Hermann Schmidt, Deutschlands erster ordentlicher Professor für Regelungstechnik, 1941 Hence, automatic control, which completes the act of objectification, is the methodical perfection of technology. Memorandum on the foundation of an institute for automatic control, Prof. Dr. Phil. Hermann Schmidt, Germany’s first full professor for automatic control, 1941 Abstract The question of how to increase driving comfort in road vehicles was already asked centuries ago. Back then, mechanical and later hydraulic solutions were found. In recent decades semi-active and active suspensions have been introduced, which alter their behavior during the ride. With those arose the need for suitable control laws. In this thesis the focus is set on preview feedforward controllers for vibration damping of a quarter car. Assuming that environmental sensors in autonomous cars can also detect road irregularities, the road profile in front of the vehicle is considered to be known. To exploit this information, various feedforward controllers are proposed.
    [Show full text]
  • Seismic Isolation Strategies for Earthquake-Resistant Construction
    Seismic Isolation Strategies for Earthquake-Resistant Construction Seismic Isolation Strategies for Earthquake-Resistant Construction: Emerging Opportunities By Mikayel Melkumyan Seismic Isolation Strategies for Earthquake-Resistant Construction: Emerging Opportunities By Mikayel Melkumyan This book first published 2019 Cambridge Scholars Publishing Lady Stephenson Library, Newcastle upon Tyne, NE6 2PA, UK British Library Cataloguing in Publication Data A catalogue record for this book is available from the British Library Copyright © 2019 by Mikayel Melkumyan All rights for this book reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of the copyright owner. ISBN (10): 1-5275-1802-7 ISBN (13): 978-1-5275-1802-5 TABLE OF CONTENTS Chapter One ................................................................................................. 1 Introduction Chapter Two ................................................................................................ 9 Concepts of Dampers for the Earthquake Protection of Existing Buildings and for Displacement Restraints in Seismically Isolated Buildings 2.1. Study of the Efficiency of Tuned Single and Double Mass Dampers on a Model of a Frame Building under Vibration Tests ................... 9 2.2. Theoretical Background: Linear and Non-Linear Analyses of a Building with and without a TMD ........................................... 20 2.3. Justification of the Transition from the Concept of Flexible Upper Floor to the Concept of Isolated Upper Floor Acting as a TMD ... 31 2.4. Structural Concept of the Series 111 Nine-Storey R/C Frame Apartment Building and the Formation of its Dynamic Design Model ............................................................................................. 34 2.5. Structural Concept of an AIUF and the Non-Linear Seismic Response Analysis of a Building Protected by an AIUF ...............
    [Show full text]
  • Recent Advances in Active Noise and Vibration Control
    Recent advances in active noise and vibration control Thilo Bein, Sven Herold, Dirk Mayer Fraunhofer LBF, Division Adaptronics, Darmstadt, Germany. Summary Noise is a serious form of environmental pollution believed to affect the lives of some 100 million European citizens. The cost of the associated damage is estimated at more than ten billion euros per year. Noise leads to serious health problems, limits the capability to learn, and effects the oc- cupants’ comfort and performance in buildings, in vehicles or at work. For instance, the automo- tive industry is more and more facing the problem of reducing the weight of the vehicle but guar- anteeing an equivalent level of comfort in terms of noise, vibration, and harshness (NVH). Im- provement of vehicle noise and vibration without affecting other performances is proving to be ex- tremely difficult if not impossible with state-of-the-art technology. Thus, active or smart concepts are being increasingly considered for the NVH optimization of vehicles besides advanced passive material systems. Within the LOEWE-Center AdRIA (Adaptronics – Research, Innovation, Application), a large in- terdisciplinary research project funded by the German federal state Hessen, and at the Fraunhofer LBF advanced noise and vibration abatement concepts were being developed and demonstrated. Among others, NVH abatement in vehicles and noise abatement in buildings is being considered. As underlying principle for noise reduction concepts, active structural acoustic control (ASAC) is primarily being considered for controlling the structural vibration of the sound radiating structure or by controlling the structure borne sound path. This paper will present an overview of the most recent concepts and results of the LOEWE-Center AdRIA such as active vibration control at en- gine mounts and smart windows.
    [Show full text]
  • Passive/Active Vibration Control of Flexible Structures
    NORTHEASTERN UNIVERSITY Graduate School of Engineering Thesis Title: Passive/Active Vibration Control of Flexible Structures Author: Matthew Jamula Department: Mechanical and Industrial Engineering Approved for Thesis Requirement of the Master of Science Degree ______________________________________________ __________________ Thesis Adviser, Dr. Nader Jalili Date ______________________________________________ __________________ Thesis Reader, Dr. Rifat Sipahi Date ______________________________________________ __________________ Thesis Reader, Dr. Bahram Shafai Date ______________________________________________ __________________ Department Chair, Dr. Jacqueline Isaacs Date Graduate School Notified of Acceptance: ______________________________________________ __________________ Dr. Sara Wadia-Fascetti, Date Associate Dean of the Graduate School of Engineering 1 PASSIVE/ACTIVE VIBRATION CONTROL OF FLEXIBLE STRUCTURES A Thesis Presented by Matthew Thomas Jamula to The Department of Mechanical and Industrial Engineering in partial fulfillment of the requirements for the degree of Master of Science in Mechanical Engineering in the field of Mechanical Engineering Northeastern University Boston, Massachusetts April 2012 2 Abstract More advanced technology and materials in industry lead to the implementation of lightweight components in order for miniaturization and efficiency. Lightweight components and certain materials however, are susceptible to vibrations. The flexible structures that make up these systems pose a great problem for vibration control. The detailed modeling of such systems greatly reduces the complexity of the control law. It is this reason that an analysis of the model as a continuous system was done. The distributed-parameters system was then effectively reduced to an equivalent lumped-parameters model. The use of this discrete system was the basis for controller design of these flexible structures. However, even the best model of a system is not able to overcome the need of an advanced controller for vibration suppression.
    [Show full text]
  • Adaptive Piezoelectric Absorber for Active Vibration Control
    actuators Article Adaptive Piezoelectric Absorber for Active Vibration Control Sven Herold * and Dirk Mayer Fraunhofer Institute for Structural Durability and System Reliability LBF, Bartningstr. 47, 64823 Darmstadt, Germany; [email protected] * Correspondence: [email protected]; Tel.: +49-6151-705-259; Fax: +49-6151-705-388 Academic Editor: Kenji Uchino Received: 14 December 2015; Accepted: 15 February 2016; Published: 29 February 2016 Abstract: Passive vibration control solutions are often limited to working reliably at one design point. Especially applied to lightweight structures, which tend to have unwanted vibration, active vibration control approaches can outperform passive solutions. To generate dynamic forces in a narrow frequency band, passive single-degree-of-freedom oscillators are frequently used as vibration absorbers and neutralizers. In order to respond to changes in system properties and/or the frequency of excitation forces, in this work, adaptive vibration compensation by a tunable piezoelectric vibration absorber is investigated. A special design containing piezoelectric stack actuators is used to cover a large tuning range for the natural frequency of the adaptive vibration absorber, while also the utilization as an active dynamic inertial mass actuator for active control concepts is possible, which can help to implement a broadband vibration control system. An analytical model is set up to derive general design rules for the system. An absorber prototype is set up and validated experimentally for both use cases of an adaptive vibration absorber and inertial mass actuator. Finally, the adaptive vibration control system is installed and tested with a basic truss structure in the laboratory, using both the possibility to adjust the properties of the absorber and active control.
    [Show full text]
  • Development of Seismic Isolation Systems Using Periodic Materials
    Project No. 11-3219 Development of Seismic Isolation Systems Using Periodic Materials Nuclear Energy Enabling Technologies Dr. Yi-Lung Mo University of Houston In collaboraon with: University of Texas-Aus5n Prairie View A&M University Argonne Naonal Laboratory Alison Hahn, Federal POC Ron Harwell, Technical POC DEVELOPMENT OF SEISMIC ISOLATION SYSTEMS USING PERIODIC MATERIALS TECHNICAL REPORT Project No. 3219 By Yiqun Yan and Y.L. Mo University of Houston Farn-Yuh Menq and Kenneth H. Stokoe, II The University of Texas at Austin Judy Perkins Prairie View A & M University Yu Tang Argonne National Laboratory Performed in cooperation with the Department of Energy September 2014 Department of Civil and Environmental Engineering University of Houston Houston, Texas ii DISCLAIMER This research was performed in cooperation with the Department of Energy (DOE), the University of Texas at Austin, Prairie View A&M University, and Argonne National Laboratory. The contents of this report reflect the views of the authors, who are responsible for the facts and accuracy of the data presented herein. The contents do not necessarily reflect the official view or policies of the DOE. This report does not constitute a standard, specification, or regulation, nor is it intended for construction, bidding, or permit purposes. Trade names were used solely for information and not product endorsement. iii ACKNOWLEDGEMENTS This research, Project No. 3219, was financially supported by the Department of Energy NEUP NEET-1 Program. Alison Hahn Krager (Federal Manager), Jack Lance (National Technical Director), and Ron Harwell (Technical POC) served as the project monitoring committee. v ABSTRACT Advanced fast nuclear power plants and small modular fast reactors are composed of thin-walled structures such as pipes; as a result, they do not have sufficient inherent strength to resist seismic loads.
    [Show full text]
  • Vibration Control of Mechanical Suspension System Using Active Force Control
    CORE Metadata, citation and similar papers at core.ac.uk Provided by Universiti Teknologi Malaysia Institutional Repository Vibration Control of Mechanical Suspension System Using Active Force Control Maziah Mohamad, Musa Mailah, Abdul Halim Muhaimin Department of Applied Mechanics Faculty of Mechanical Engineering Universiti Teknologi Malaysia 81310 Skudai, Johor [email protected], [email protected], [email protected] Abstract: This paper presents the practical implementation of an active force control (AFC) strategy to a laboratory scaled vibration isolator platform. The research was carried out to investigate the performance of vibration suppression capability of feedback controller using AFC. Two types of controller schemes were examined and compared involving the classic proportional- integral-derivative (PID) controller and AFC scheme. The laboratory scaled physical rig was developed using the MATLAB/Simulink with Real Time Workshop (RTW) tool that is interfaced with a suitable data acquisition card via a personal computer (PC) as the main controller. Appropriate vibration source was modelled and applied to the proposed systems to test for the system robustness. Results obtained in this study verified the potential and superiority of the proposed AFC scheme as a robust active vibration suppressor compared to the other schemes considered in the study. Keywords: Vibration, suspension system, active force control, robust, real-time. 1. Introduction Vibration can be pleasant and useful as in massaging and therapeutic application but at the same time it can be unpleasant and harmful too because it can lead to catastrophic failures of components and materials. Unwanted vibration can interfere with our comfort, damage to structures, reduction of equipment performance and machinery noise level.
    [Show full text]
  • Earthquake Protection in Buildings Through Base Isolation
    fECH RLC N4TL INST- OF STAND 4 NIST Special Publication 832, Volume 1 A111D3 7aTm7 Earthquake Resistant Construction Using Base Isolation NIST I PUBLICATIONS [Shin kenchiku kozo gijutsu kenkyu iin-kai hokokusho ] Earthquake Protection in Buildings Through Base Isolation United States Department of Commerce Z Technology Administration 832 National Institute of Standards and Technology V.1 1992 7he National Institute of Standards and Technology was established in 1988 by Congress to "assist industry in the development of technology . needed to improve product quality, to modernize manufacturing processes, to ensure product reliability . and to facilitate rapid commercialization ... of products based on new scientific discoveries." NIST, originally founded as the National Bureau of Standards in 1901, works to strengthen U.S. industry's competitiveness; advance science and engineering; and improve public health, safety, and the environment. One of the agency's basic functions is to develop, maintain, and retain custody of the national standards of measurement, and provide the means and methods for comparing standards used in science, engineering, manufacturing, commerce, industry, and education with the standards adopted or recognized by the Federal Government. As an agency of the U.S. Commerce Department's Technology Administration, NIST conducts basic and applied research in the physical sciences and engineering and performs related services. The Institute does generic and precompetitive work on new and advanced technologies. NIST's research
    [Show full text]
  • Study of Base Isolation Systems
    Study of Base Isolation Systems by ARtCHNVES MASSACHUSEMS INS rE. OF TECHNOLOGY Saruar Manarbek JUL 0 8 2013 Bachelor of Engineering in Civil Engineering University of Warwick, 2012 LIBRARIES Submitted to the Department of Civil and Environmental Engineering in Partial Fulfillment of the Requirements for the Degree of Master of Engineering at the Massachusetts Institute of Technology June 2013 @2013 Massachusetts Institute of Technology. All rights reserved. Signature of Author: Department of Civil and Environmental Engineering May 21, 2013 Certified by: Jerome J. Connor 7 Professor of Civil and Environmental Engineering Thesis Supervisor if /7 A Accepted by: - I H idi Nepf Chair, Departmental Committee for Graduate tudents Study of Base Isolation Systems by Saruar Manarbek Submitted to the Department of Civil and Environmental Engineering in May, 2013 in Partial Fulfillment of the Requirements for the Degree of Master of Engineering in Civil and Environmental Engineering Abstract The primary objective of this investigation is to outline the relevant 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 the superstructure and the isolation system are also described. Elastic time-history analyses were carried out using comprehensive finite element structural analysis software package SAP200. Time history analysis was conducted for the 1940 El Centro earthquake. Response spectrum analysis was employed to investigate the effects of earthquake loading on the structure. In addition, the building lateral system was designed using the matrix stiffness calibration method and modal analysis was employed to compare the intended period of the structure with the results from computer simulations.
    [Show full text]
  • Seismic Isolation Technology March 18-20,1992
    International Atomic Energy Agency IWGFR / 87 International Working Group on Fast Reactors XA0055376 IAEA Specialists' Meeting on Seismic Isolation Technology March 18-20,1992 Proceedings GE Nuclear Energy 6835 Via Del Oro, %, 3 1/36 San Jose, California 95119 93-077-01 International Atomic Energy Agency IWGFR/87 International Working Group on Fast Reactors IAEA,Spe^^|Meeting on Seismic Is6itti^OTechnology MarchvlS-20,1992 Proceedings GE Nuclear Energy 6835 Via Del Oro, San Jose, California 95119 93-077-01 IAEA Specialists' Meeting on Seismic Isolation Technology San Jose, California, March 18-20, 1992 FORWORD The International Atomic Energy Agency held a Specialists' Meeting on Seismic Isolation Technology in San Jose, California, on March 18-20, 1992. Twenty-three experts from seven countries participated including V. Arkhipov, as the IAEA representative. The objective of the meeting was to provide a forum for review and discussion of seismic isolation technology applicable to thermal and fast reactors. The meeting was conducted consistent with the recommendations of the IAEA Working Group Meeting on Fast Breeder Reactor-Block Antiseismic Design and Verification in Bologna, October 1987, to augment a coordinated research program with specific recommendations and an assessment of technology in the area of seismic isolation. Seismic isolation has become an attractive means for mitigating the consequences of severe earthquakes. Although the general idea of seismic isolation has been considered since the turn of the century, real practical
    [Show full text]