A method which employs microtremor has been introduced for estimating dynamic characteristics of surface
layers, in early 1950. Then usage of this method has received lots of criticism considering uncertainty about
source of microtremor. After an introduction of the Nakamura’s technique (H/V or QTS technique;
Nakamura, 1989), many people have paid a renewed great attention for estimating dynamic characteristics of
ground and structures using microtremor, since clear and reliable information was provided by very simple
and inexpensive noise measurements.
In recent years, although several researchers claimed that theoretical ground of this technique is not clear and
consensus based on experiment couldn’t be reached, there have been many successful experimental studies
based on these technique. Many theoretical studies have been performed, for explaining the amount of types
of waves included in microtremor and checking the applicability of the QTS technique. And some of them
are suggested that the peak on H/V ratio can be explained with the fundamental peak of Rayleigh waves.
From the output of these researches, explanation of microtremor with Rayleigh waves caused some confusion
between users and the author decided to clear out this problem.
The basic idea and the main goal of QTS technique are tried to be re-explained in present paper. The author’s
explanation about the effects of contents of Rayleigh waves in microtremor is also given. Other possible
usage of products from QTS technique (predominant frequency and amplification factor) for hazard
estimation is also given.
DIRECT LINKS
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Plate structures are used in almost every area of engineering, including aerospace and naval architecture, civil engineering, and electronics. These structures have diverse geometries and have to withstand a wide range of loading conditions. This book provides the theoretical foundations of the theories of plates manufactured from various materials, outlines and illustrates the methods used for the analysis of these structures, and emphasizes designs and solution techniques available to an engineer. The book is written for engineers working in industry, graduate students at aerospace, mechanical, civil engineering and naval architecture departments, and investigators interested in the development of the theory of plates and related subjects. While the mathematical modeling employed in the book is understandable to both engineers and graduate students, the book also provides insight into relevant phenomena and theories underlying plate structures. Thus, the reader is equipped with a thorough understanding of the problems and appropriate assumptions, even if the analysis is conducted using commercially available software codes. In addition, the book includes numerous analytical solutions that can confidently be used in the design of plate structures. The combination of theoretical insight and references to practical problems makes the book equally attractive to academia and industry.
Related subjects » Mechanical Engineering - Mechanics
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COMPARISON OF NONLINEAR STATIC AND NONLINEAR DYNAMIC ANALYSES IN THE ESTIMATION OF THE MAXIMUM DISPLACEMENT FOR STRUCTURES EQUIPPED WITH VARIOUS DAMPING DEVICES
Author: Payam Tehrani and Shahrokh Maalek | Size: 1.47 MB | Format:PDF | Publisher: 4th International Conference on Earthquake Engineering | Year: 2006 | pages: 10
4th International Conference on Earthquake Engineering
Taipei, Taiwan
October 12-13, 2006
Paper No. 129
ABSTRACT
In this study, the nonlinear static (pushover) and nonlinear dynamic procedures in the determination
of maximum displacements of an existing steel structure retrofitted with different methods have been
compared. These methods include the use of the EBF systems; RC Shear Walls and the use of
Passive energy dissipators such as metallic, viscous, viscoelastic and friction dampers. In nonlinear
dynamic procedure, the response of the structure to seven scaled earthquake records has been
obtained and the average value of the responses is used for comparison. At the same time in nonlinear
static procedure, the maximum displacements of the structure in two different load distribution
patterns have been obtained. The results demonstrate that the nonlinear static procedure determines
the maximum displacement of the structure conservatively.
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Development of seismic fragility surfaces for reinforced concrete buildings by means of nonlinear time-history analysis
Author: D. M. Seyedi, P. Gehl, J. Douglas, L. Davenne, N. Mezher and S. Ghavamian | Size: 494 KB | Format:PDF | Publisher: EARTHQUAKE ENGINEERING AND STRUCTURAL DYNAMICS | Year: 2009 | pages: 18
EARTHQUAKE ENGINEERING AND STRUCTURAL DYNAMICS
Earthquake Engng Struct. Dyn. 2010; 39:91–108
Published online 3 August 2009 in Wiley InterScience. DOI: 10.1002/eqe.939
SUMMARY
Fragility curves are generally developed using a single parameter to relate the level of shaking to the
expected structural damage. The main goal of this work is to use several parameters to characterize the
earthquake ground motion. The fragility curves will, therefore, become surfaces when the ground motion
is represented by two parameters. To this end, the roles of various strong-motion parameters on the induced
damage in the structure are compared through nonlinear time-history numerical calculations. A robust
structural model that can be used to perform numerous nonlinear dynamic calculations, with an acceptable
cost, is adopted. The developed model is based on the use of structural elements with concentrated
nonlinear damage mechanics and plasticity-type behavior. The relations between numerous ground-motion
parameters, characterizing different aspects of the shaking, and the computed damage are analyzed and
discussed. Natural and synthetic accelerograms were chosen/computed based on a consideration of the
magnitude-distance ranges of design earthquakes. A complete methodology for building fragility surfaces
based on the damage calculation through nonlinear numerical analysis of multi-degree-of-freedom systems
is proposed. The fragility surfaces are built to represent the probability that a given damage level is reached
(or exceeded) for any given level of ground motion characterized by the two chosen parameters. The
results show that an increase from one to two ground-motion parameters leads to a significant reduction
in the scatter in the fragility analysis and allows the uncertainties related to the effect of the second
ground-motion parameter to be accounted for within risk assessments.
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Posted by: parwez007 - 07-13-2011, 09:17 AM - Forum: Archive
- No Replies
Dear CivilEA members
I am looking for papers regarding construction and demolition waste management strategies in view for policy-making in my own country, Mauritius. Does anyone have any info about the above mentioned subject as this will help me in my dissertation.
RECOMMENDED GUIDELINES FOR LIQUEFACTION EVALUATIONS
USING GROUND MOTIONS FROM
PROBABILISTIC SEISMIC HAZARD ANALYSES
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1) Maintain grants to work and resources for users of the Planview system.
2) Maintain work and resource calendars.
3) Maintain Planview Business Model Structures.
4) Maintain Investment models and configurations.
5) Create and maintain project models and workflows.
6) Periodically check for inconsistencies in the database.
7) Provide a central point of contact for technical/application assistance for both organizational staff and Planview Product Support
If you could share this paper with us, I will be really appreciated.
Title:The numerical solution of steady water wave problems
Author:J.D. Fenton
Journal:Computers & Geosciences
Volume 14, Issue 3, 1988, Pages 357-368
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Could anyone upload this paper. Seems to me that my university lost subscription to this journal.
Three-dimensional finite element analysis of the direct simple shear test
James Doherty and Martin Faheya
Computers and Geotechnics
Article in Press, Corrected Proof - Note to users
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doi:10.1016/j.compgeo.2011.05.005
Hi,
I am studying in Masters and taken the subject Advance Reinf. Concrete.
I have to prepare a Research based Report (Seminar) on RCC.
But i can't select the topic, I want to do my seminar on the Behaviour of RCC but I have no idea which Area to select.
Can anyone HELP me out on it??
I am not intending to take the Behaviour of Concrete in Fire conditions, as most of the students love to do work on this...
You can suggest me any topic with some references if you like..
Have a nice day...
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