Critical Excitation Methods for Important Structures *** New Paradigm in Earthquake... 1/5 ページ

Critical Excitation Methods for Important Structures
New Paradigm in Earthquake Engineering ***Prof Izuru Takewaki
Kyoto University
Last updated on 19 November 2010
There are a variety of buildings in a city. Each building has its own natural period and its origina
structural properties although there exist a lot of uncertainties (Tsompanakis et al. 2008). Whenearthquake occurs, a variety of ground motions are induced in the city. The combination of the bnatural period with the predominant period of the induced ground motion may lead to disastrous
phenomena in the city. Many past earthquake observations demonstrated such phenomena. On
earthquake occurs, some building codes are upgraded. However, it is true that this repetition neresolves all the issues and new damage problems occur even recently. In order to overcome thproblem, a new paradigm has to be posed. The concept of ‘critical excitation’ and the structural
based upon this concept could become one of such new paradigms (Takewaki 2006, 2008).
It is believed that earthquake has a bound on its magnitude. In other words, the earthquake ene
radiated from the fault has a bound. The problem is to find the most unfavorable ground motion
building or a group of buildings. A ground motion displacement spectrum or acceleration spectr
been proposed at the rock surface depending on the seismic moment, distance from the fault, espectrum may have uncertainties. One possibility or approach is to specify the acceleration or v
power and allow the variability of the spectrum (Takewaki 2006, 2008).
The problem of ground motion variability is very important and tough. Code-specified design gro
motions are usually constructed by taking into account the knowledge from the past observation
probabilistic insights. However, uncertainties in the occurrence of earthquakes (or ground motio
fault rupture mechanisms, the wave propagation mechanisms, the ground properties, etc. cause
difficulty in defining reasonable design ground motions especially for important buildings in whic
damage or collapse has to be avoided absolutely (Singh 1984, Anderson and Bertero 1987, Ge1997, Takewaki 2002, 2006, 2008, Stein 2003).
A long-period ground motion has been observed in Japan recently. This type of ground motion
cause a large seismic demand to such structures as high-rise buildings, base-isolated buildings
al. 2006), oil tanks, etc. This large seismic demand results from the resonance between the lon
ground motion and the long natural period of these constructed facilities.
A significance of critical excitation is supported by its broad perspective. There are two classes
buildings in a city. One is the important buildings which play an important role during disastrous
earthquakes. The other one is ordinary buildings. The former one should not have damage duri
earthquake and the latter one may be damaged partially especially for critical excitation larger t
specified design earthquakes. The concept of critical excitation may enable structural designers
ordinary buildings more seismic-resistant.
The most critical issue in the seismic resistant design is the resonance. The promising approac
shift the natural period of the building through seismic control and to add damping in the buildin
However it is also true that the seismic control is under development and more sufficient time isnecessary to respond to uncertain ground motions. The book by Takewaki (2006) will help thedevelopment of new seismic-resistant design methods of buildings for such unpredicted or unprground motions.

http://www.scitopics.com/Critical_Excitation_Methods_for_Important_Structures_Ne... 2011/10/19

Critical Excitation Methods for Important Structures *** New Paradigm in Earthquake... 2/5 ページ

It is stated in the book by Takewaki (2006) that the research by Dr.Takewaki was greatly motiva
papers by Drenick (1970) and Shinozuka (1970). Dr.Takewaki communicated with Prof.Drenickand was informed that the work by Prof.Drenick was motivated by his communication with Japa
researchers in late 1960’s. After 40 years, a Japanese researcher has made remarkable advan
this field.

Further reading• Anderson, J. C., and Bertero, V. V. (1987). "Uncertainties in establishing design earthquakes. "Engrg., ASCE, 113(8), 1709-1724.
• Ariga, T., Kanno, Y. and Takewaki, I. (2006). "Resonant behavior of base- isolated high-rise bu
under long-period ground motions", The Structural Design of Tall and Special Buildings, 15(3), 3• Drenick, R. F. (1970). "Model-free design of aseismic structures." J. Engrg. Mech. Div., ASCE,483-493.
• Drenick, R.F. (2002). Private communication.
• Geller, R.J., Jackson, D.D., Kagan, Y.Y., and Mulargia, F. (1997). "Earthquakes cannot be predScience, 275, 1616.
• Shinozuka, M. (1970). "Maximum structural response to seismic excitations. " J. Engrg. Mech. D
ASCE, 96(EM5), 729-738.
• Singh, J.P. (1984). "Characteristics of near-field ground motion and their importance in building
ATC-10-1 Critical aspects of earthquake ground motion and building damage potential, ATC, 23• Stein, R.S. (2003). "Earthquake conversations." Scientific American, 288(1), 72-79.
• Takewaki, I. (2000). ''Dynamic Structural Design -Inverse Problem Approach- '', WIT Press (UK280pages, 2000. (Link »)• Takewaki, I. (2002). "Critical excitation method for robust design: A review." J. Struct. Engrg., A(5), 665-672.
• Takewaki, I. (2006). Critical Excitation Methods in Earthquake Engineering, Elsevier, 268pages(Link »)• Takewaki, I. (2008). "Critical excitation methods for important structures" , invited as a Semi-PleSpeaker, EURODYN 2008, July 7-9, 2008, Southampton, England.
• Takewaki, I. (2009). ''Building Control with Passive Dampers -Optimal Performance- based Des
Earthquakes-'', John Wiley & Sons Ltd. (Link »)• Tsompanakis, Y., Lagaros, N.D. and Papadrakakis, M. (eds.) (2008). Structural Design Optimiz
Considering Uncertainties, Taylor & Francis.
• I.Takewaki, K.Fujita, Earthquake Input Energy to Tall and Base-isolated Buildings in Time and F
Dual Domains, J. of The Structural Design of Tall and Special Buildings, Vol.18, No.6, pp589–6(2008 Paper of the Year) (Link »)Selected links• Critical Excitation Book (Elsevier)• Dynamic Structural Design (WIT Press)• Engineering Structures (Elsevier Journal)

http://www.scitopics.com/Critical_Excitation_Methods_for_Important_Structures_Ne... 2011/10/19

Critical Excitation Methods for Important Structures *** New Paradigm in Earthquake... 3/5 ページ• Council on Tall Buildings and Urban Habitat• IUTAM• ASCE SEI• EERI• American Academy of Mechanics• Architectural Institute of Japan• Structural Engineering and Mechanics• Interaction and Multiscale Mechanics• Advances in Structural Engineering• Building Control with Passive Dampers (Book)• Structural Control and Health Monitoring (editorial board)• Soil Dynamics and Earthquake Engineering (editorial board)• Earthquakes and Structures (Editors-in-Chief)

Categories
Engineering
Civil and Structural Engineering

Related pages on SciTopics• How to Manage Construction Defects• Generation, Composition and Characteristics of Municipal Solid Waste in Bangladesh• Salt precipitation rate analyzed by Dry gauze method and Doken tank method• Landfill cap cover and reinforced materials• SERVICEABILITY BEHAVIOUR OF CONCRETE MEMBERS REINFORCED WITH FRP BARS
• Corrosion of steel bars embedded in Concrete under severe environmental conditions• Mutifield and multiscale simulations of engineering and biological sytructures toward virtual real
• Neutron radiography applied to study deteriorating mechanisms in cracked concrete structures• Properties of Cement- and Lime-Modified Clay Subjected to Freeze-Thaw Cycles• Shape optimum design of arch dams

Related peer-reviewed articles
Updated 19 Oct 2011
Sorry, no recent articles were found

http://www.scitopics.com/Critical_Excitation_Methods_for_Important_Structures_Ne... 2011/10/19

Critical Excitation Methods for Important Structures *** New Paradigm in Earthquake... 4/5 ページ

Web search results
Updated 19 Oct 2011
1. Closure to discussion of critical earthquake load inputs for multi-degree-of-freedom inelastic sJan 2011
Abstract This closure addresses the comments raised by Dr Ashkinadze on the author' s paper
modeling critical earthquake load inputs for multi- degree-of-freedom inelastic structures [JSV 3532&ndash; 544].
[http://www.sciencedirect.com/science?_ob=GatewayUR...]
2. talks.cam : Critical Excitation Methods for Important Structures
May 2011
There are various buildings in a city. Each building has its own natural period and its original str
properties. When an earthquake occurs, a variety of ground motions are induced in the city.
[http://talks.cam.ac.uk/talk/index/12751]
3. talks.cam : Critical Excitation Methods for Important Structures
Feb 2011
There are various buildings in a city. Each building has its own natural period and its original str
properties. When an earthquake occurs, a variety of ground motions are induced in the city.
[http://talks.cam.ac.uk/talk/index/12560]
4. talks.cam : Critical Excitation Methods for Important Structures
Feb 2011
There are various buildings in a city. Each building has its own natural period and its original str
properties. When an earthquake occurs, a variety of ground motions are induced in the city.
[http://talks.cam.ac.uk/talk/index/12450]
5. Critical Excitation Methods in Earthquake Engineering - Elsevier
Jan 1900
In the seismic resistant design of building structures, the concept of &lsquo; performance-based
design&rsquo; has become a new paradigm guaranteeing the maximum satisfaction of building[http://www.elsevier.com/wps/find/bookdescription.c...]
6. Smart passive damper control for greater building earthquake resilience in sustainable cities
Feb 2011
Abstract Passive dampers are used recently in many mid and high- rise buildings. This trend isaccelerated by the increased demand and desire for safer, more reliable and more comfortable
under uncertain external loading and environment. ...
[http://www.sciencedirect.com/science?_ob=GatewayUR...]
7. Elsevier: Critical Excitation Methods in Earthquake Engineering by Takewaki Engineering Bo
ebooks Online
Jun 2011
Elsevier Science brings you Critical Excitation Methods in Earthquake Engineering by Takewak
978-0-08-045309-5). Visit Elsevier today for all your Engineering books and ebooks.
[http://www.elsevierdirect.com/product.jsp?isbn=978...]
8. Elsevier: Critical Excitation Methods in Earthquake Engineering by Takewaki Engineering Bo
ebooks Online
Jan 1900

http://www.scitopics.com/Critical_Excitation_Methods_for_Important_Structures_Ne... 2011/10/19

Critical Excitation Methods for Important Structures *** New Paradigm in Earthquake... 5/5 ページ

Since the occurrence of earthquakes and their properties are very uncertain even with the preseknowledge, it is too difficult to define reasonable design ground motions especially for importanbuildings.
[http://www.elsevierdirect.com/product.jsp?websitei...]
9. MULTIDISCIPLINARY CENTER FOR EARTHQUAKE ENGINEERING RESEARCH...
Jul 2006
A 1. Year 5 II.A-1.1 Program 1: Seismic Evaluation and Retrofit of Lifeline Networks II. A-1.3 Pr
Seismic Retrofit of Hospitals II.A-1.59 Program 3: Earthquake Response and Recovery II.A-1.14
Networks for Seismic Assessment and Retrofit of . ..
[http://mceer.buffalo.edu/research/NSFResearch/Annu...]10. Assessment of seismic damage to civil structures using statistical pattern recognition techni
time series analysis
Jan 2009
The ability to estimate seismic induced damage to civil infrastructure is undoubtedly one of theimportant challenges faced by structural engineers. In this research two complementary methoddamage estimation using either knowledge of the . ..
[http://hdl.handle.net/2292/4270]

Related keywords
abutment - access key - acoustics - additional damage - admission requirements - african amer
ambient vibration - analysis problem - analytic geometry - analytical model - anchored - appliedmathematics - applied mechanics - applied physics - ar model - artificial neural networks - backpropagation - beam to-column connections - biochemical engineering - bioengineering - biomedengineering - biomolecular engineering - building structure - cantilever - cantilever beam

How to cite this page
APA style:
Takewaki, Izuru (2010, November 19). Critical Excitation Methods for Important Structures *** N
Paradigm in Earthquake Engineering ***. SciTopics. Retrieved October 19, 2011, fromhttp://www.scitopics.com/Critical_Excitation_Methods_for_Important_Structures_New_Paradigm

Copyright © 2011 Elsevier B.V. All rights reserved. SciTopics™ is a trademark of Elsevier B.V. S
registered trademark of Elsevier Properties S.A., used under license

http://www.scitopics.com/Critical_Excitation_Methods_for_Important_Structures_Ne... 2011/10/19