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How to optimise tall buildings for wind
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B.V.Harsoda
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Joined: 19 Jan 2009
Posts: 2321
Location: RAJKOT,GUJARAT, INDIA

PostPosted: Tue Nov 27, 2012 8:14 am    Post subject: Reply with quote

Papers:-

The 14th World Conference on Earthquake Engineering    
October 12-17, 2008, Beijing, China  
1
Seismic Analysis of Wind Turbine System Including Soil-structure Interaction
Guangling He
1
and Jie Li
2
1
Ph.D Candidate, Dept. of Building Engineering , Tongji University, Shanghai. China  
2
Professor, Dept. of Building Engineering , Tongji University, Shanghai. China
Email:hglcool@126.com
ABSTRACT:
A numerical method is presented for the computation of  artificial earthquake records consistent with anyarbitrarily specified target response spectra (TRS) requirements. The proposed algorithm does not create new time histories but rather modifies, on the basis of an iterative deterministic approach, existing records to fit specific
design requirements. The efficiency of the algorithm and the accuracy of the fitting process are substantially improved on the basis of a predictor–corrector type approach. Then, the behavior and the load capacity of the 1MW horizontal wind turbine steel tower have been studied with the aid of a refined finite element model. The structure is analyzed for seismic loads representing the  effects of gravity and possible site-dependent seismic motions. To evaluate the effect of the soil-structure interaction (SSI) on the dynamic performance of wind turbine system, a comparative finite element model taking the foundation and surrounding soil into consideration is also created. Comparative studies have been performed on the results of the above analyses and some useful conclusions are drawn pertaining to the effectiveness and accuracy of the various models used in this work.  

Source Link:-
http://www.iitk.ac.in/nicee/wcee/article/14_05-01-0196.PDF

Regards,
Er. B. V. Harsoda
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B.V.Harsoda
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Joined: 19 Jan 2009
Posts: 2321
Location: RAJKOT,GUJARAT, INDIA

PostPosted: Tue Nov 27, 2012 8:21 am    Post subject: Reply with quote

The 14th  World Conference on Earthquake Engineering    
October 12-17, 2008, Beijing, China  
SEISMIC CONSIDERATION FOR HIGH RISE CONCRETE WIND TURBINE
TOWERS
Henry Huang
1
, Jim Ma
2
, Rong Xu
3
and XiaoWei Wu
4
1
Technical Director, WSP Asia, Hong Kong. P. R. China
2
Senior Technical Specialist, California Department of Transportation, Sacramento, California,USA
3
Senior Specialist, Palmer Turner Corporation (China), Shanghai, P.R. China
4
Technical Director, Shanghai WAY Metal Structures Limited, Shanghai, P.R. China
Email: cdhuang@gmail.com
ABSTRACT :
Globally increasing demand and cost of energy motivate the Shanghai Science and Technology Development
Committee wind energy research program to develop a large wind turbine (LWT) technology that will allow wind systems to compete in regions of low wind speed. Most of current wind turbine powers on world are less than 1.0 MW supported by tubular steel towers and their tower height less than 80 meter. Earthquake load may not be
significance to the tower design due to following reasons; first, wind turbine towers often are placed in wide-open fields and high wind gust areas, the wind load from the turbine and direct wind pressure on the tower usually governs the design of the tower; second, steel tubular tower structures usually are lighter than concrete structures,
thus, they have less seismic inertial force than that of concrete tower. For large wind turbine towers with the turbine head weight getting heavier, the seismic  load very likely becomes governing loading case for a pre-stressed concrete tower, especially in region of the high seismic zones. As tower getting taller and support large turbines, pre-stressed concrete tower solution becomes more competitive in overall cost in the latest study. In this paper a series height of the pre-stressed concrete towers segmental stacked and post-tensioned by tendons are studied and compared with steel tubular towers under prescribed seismic load under different design code including China GB, US IBC 2003 and Euro-code. The tapered tower fundamental dynamic properties are estimated by the Raleigh-Ritz method and compared with FEM results.

Source Link:-
http://www.iitk.ac.in/nicee/wcee/article/14_05-06-0014.PDF

Regards,
Er. B. V. Harsoda
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B.V.Harsoda
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Joined: 19 Jan 2009
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PostPosted: Tue Nov 27, 2012 8:26 am    Post subject: Reply with quote

The 14th  World Conference on Earthquake Engineering    
October 12-17, 2008, Beijing, China  
SHAKE TABLE TEST OF A 65kW WIND TURBINE AND
COMPUTATIONAL SIMULATION
I. Prowell
1
, M. Veletzos
2
, A. Elgamal
3
, and J. Restrepo
3
1
Graduate Student Researcher, Dept. of Structural Engineering , University of California, San Diego, USA
2
Post-Doctoral Researcher, Dept. of Structural Engineering, University of California, San Diego, USA
3
Professor, Dept. of Structural Engineering, University of California, San Diego, USA
Email: iprowell@ucsd.edu, mveletzo@ucsd.edu, elgamal@ucsd.edu, jrestrepo@ucsd.edu
ABSTRACT :
This paper presents the experimental results from an initial series of full scale shake table tests of a 65kW wind turbine with a 23 m hub height.  Using the experimental results, a calibrated finite element model was developed to investigate and highlight salient characteristics of the wind turbine’s seismic response.  The
model was subjected to a number of earthquake records from California.  Five high-intensity historical input ground motions, which produced significant response in the turbine, were used to investigate the difference in seismic demand of a parked turbine for uni-axial and bi-directional excitation scenarios.  The  experimental
data and simulation results shed light on the basic seismic response characteristics of wind turbines similar to that tested.

Source Link:-
http://www.iitk.ac.in/nicee/wcee/article/14_12-01-0178.pdf

Regards,
Er. B. V. Harsoda
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Dr. N. Subramanian
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Joined: 21 Feb 2008
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Location: Gaithersburg, MD, U.S.A.

PostPosted: Tue Nov 27, 2012 10:31 pm    Post subject: Re: Query about Wind Turbines Installed in Buil Reply with quote

Dear Er Sameer Dhuri,

Good questions. but no one in India can answer them, as we do not have experience in designing such structures- Anyhow read the papers through the links provided by our Er Harsoda.

Tall buildings require lot of energy, to provide for heating, cooling, running the lifts, etc. Hence it is better to provide self energy development systems, which will not increase the load in the normal Electricity grids. Due to the height, the wind loads can be used- hence only recently such buildings with wind turbines have been constructed. their long term effects and usefulness have to be carefully studied.

Best wishes,
NS
SameerDhuri wrote:
Dear Dr.Suresh Kumar/Sir and Other Senior Sefians,
                                        Can you please enlighten me on :-
1.How should one approach design of Building Mounted / Integrated Wind Turbines(High Rise with Wind Turbines) for example the Bahrain World Trade Center and Pearl River Tower
in Guangzhou, China?  
2. How will the Vibration caused due to Turbines hamper the Structural Stability & prevention of the same?
3.How feasible will it be for Indian Scenario with respect to Green Building (LEED) Advantage that it would get in long term due to Energy savings?

Best Regards,
Sameer Dhuri
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