Frequency-Domain Approach for Calculating
Wind-Induced Vibration and Aeroelastic Stability Characteristics
of Long-Span Bridges
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Risto Kiviluoma: Frequency-Domain Approach for Calculating Wind-Induced Vibration and Aeroelastic Stability Characteristics of Long-Span Bridges
Doctoral dissertation at Helsinki University of Technology
The frequency-domain approach is applied to the aerodynamic and aeroelastic analysis of long-span bridges. Numerical models are deduced for the simultaneous buffeting and flutter analysis and for the vortex and signature turbulence induced response calculation.
The goal, considered to be achieved, is to develop numerical models capable to reliable parametric studies of detailed three-dimensional structural models of bridges. For the models, semi-empirical approach based on aerodynamic data obtained through section model tests in a wind tunnel, is employed. The data consists of the steady aerodynamic coefficients and flutter derivatives of a deck
segment to be used in the buffeting and flutter analysis. A complemental data is suggested to be extracted for the
vortex and signature turbulence induced response calculation.
The simultaneous analysis model for buffeting and flutter uses theoretically complete coupled-mode approach in which most of the unintentional simplifications of earlier models are removed. It has merits for the non-iterative calculation of flutter characteristics and feasibility to efficient computer implementation. The vortex-induced response calculation is based on the band-limited white-noise excitation model while the signature-turbulence model employs approach typical in simplified buffeting analysis of bridge girders. The
vortex-induced vibration calculation model facilitates imperfect spanwise correlation and turbulence reduction effects through mutually simple mathematical formulation. To obtain aerodynamic input parameters for the verification study, wind tunnel tests for the spring supported section model are carried out in a smooth flow. The Instrumental variable method is formulated for acceleration signals and used on evaluating flutter derivatives through coupled-motion experiments. To verify the numerical models, the calculated responses of the Raippaluoto and Kärkinen Bridges, two cable-stayed bridges in Finland involving double I-girder steel-concrete composite deck, are compared with the on-site measurements. Here, the responses and the wind turbulence data are measured on three occasions during storm and strong winds in 1999-2000.
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PMP Project Management Professional Study Guide (Certification Press)
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PMP Project Management Professional Study Guide (Certification Press)
Publisher: McGraw-Hill Osborne Media | ISBN: 0072230622 | edition 2003 | CHM | 588 pages | 11,05 mb
Get the book that shows you not only what to study, but how to study. The only classroom-based integrated study system for professional certification gives you complete coverage of all objectives for the PMP exam, hundreds of practice exam questions, and hands-on exercises.
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NIED has been constructing 3-D Full-Scale Earthquake Testing Facility, nicknamed "E-Defense" in the city of Miki, to the north of Kobe. Construction of this facility began in 1999 and will be completed in 2005. Therefore, this facility will begin to make its contribution ten years after the Hyogoken Nanbu (Kobe)Earthquake.
The world's largest shaking table, which can simulate high level ground motions, is taking shape in Japan. The opportunities and challenges provided through this facility are great. It will be a focus of full-scale testing of structures due to high-intensity earthquakes. It is a vehicle through which hope and optimism for improving the behavior of urban regions due to earthquakes will get an added boost.
Collection of videos of shaking table tests of a number of structures:
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The 4-story steel structure listed there was subject to a very interesting performance based engineering study by Deierlein et al, and the results just appeared in the latest issue of EERI´s Earthquake Spectra:
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Imperial College Press
Clifford F Bonnett
1-86094-515-5
Pages : 213
File Size :8.08 MB
In the new millennium, the transport of people and materials has an even greater significance world-wide than it had in the immediate past. The birth and evolution of railways during the last two centuries has had an normous influence on industrial,social and economic development.
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Energy efficiency of power plant, Reactor design and other perspectives, Accidents and losses, Feasibility study
79 pages
published this 06/25/2009
Acknowledgement: Engr. M. Ali Zulquarnain Director, ROMU, AERE, BAEC MA Islam, Dept of MECHE, BUET
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1.Click "POSTGEN" button, on top your windows wall
2.Fill the "Title", ex : Strut and Tie Modelling to New AS3600 Provisions
To fill cover, you must click "click to upload"
3.Click "Browse" button to fill your pic (make it first in JPEG better after you cropp and compress the file to minimize Size)
and click "Start Uploading" button...wait for a second..
4.Copy the address link in Direct Link and paste to cover
[
5.Fill Cover link from paste the link (from step #4) , Fill the Info and Fill the Download Link
6.and clik "Generate"Button then copy
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and Paste the words that you copy from CivilEa Post Generator (see Step#6)
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Keep trying to post with the right way..This is the Forum Rules
a new change in forum is you can comment on other user profile. for do this:
1- click on username that you want to comment for him/her
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3- in "Add a new comment" box, write your comment & click "add comment"
4- your comment will be appear in user profile & everyone can see it. :w00t:
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Errata for AWS A2,4-98 Standard symbols for welding, brazing, and nondestructive examination.
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This revision of AS 1170 part 4 - 2007 for those who are interested in updated Aussie design code in seismic design.
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as I told in other part of this forum, I think that all members like me ( working all day to get some money in pocket ) haven't so much time ( & $$$ ) to follow courses in the right way , but wish to become a
civil engineer, are looking to this forum as a main source of information and education. So that the 'inactive user' status should be quite common as I spend the most of my (free) time reading what other people are saying or downloading some software just to see how some problem are managed. I'm also a bit worried about the skill ( mine ) , I prefer keep silent while hear from other instead to say nonsense. Don't loose the forum membership it's important for me, but I ( and members like me ) need more time.
Challenge is :
I feel this forum really useful and of a certain professional skill .
Could experienced ( or professionals ) members become tutor ( better a 'Mentore' ) for members like me ? That's what I'm searching for , more than looking in software section.
My apologize to all could find this post stupid or worst offensive, but who loves science can understand .
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