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Keywords: cooling towers, solar chimneys, shell structures, wind induced stresses, dynamic instabilities, forced wind vibrations.

Summary

For nearly a century, natural draft cooling is well established in power generating technology. For this purpose there are large reinforced concrete (RC) shell structures in use, natural draft cooling towers (NDCT), presently with maximum heights of 200 m [1]. In the design state there are planned even higher cooling towers, so-called dry ones, with heights up to 300 m. Future solar chimney power plants (SCPP), which use the natural updraft of sun-heated air for sustainable electricity generation, require shell tower chimneys of over 500 m in height. Presently in the design phase are chimneys of up to 1500 m.

All these tower structures are heavily exposed to natural wind actions. They may lead together with dead load, service temperatures and seismic phenomena to severe response effects, like high stresses, structural instabilities and forced storm vibrations. Starting from well known responses of presently largest NDCTs, the paper describes typical response phenomena of those very new solar chimneys. The principle example here is a solar chimney project of 1000 m of height [2]. The paper further emphasizes that some of these phenomena may reduce the safety of the structure considerably, others are merely not recognized to full depth. In a design realization, all have to be treated and accompanied with extreme care.

References

1: D. Busch, R. Harte, W.B. Krätzig, U. Montag, "New Natural Draft Cooling Tower of 200m of height", Journ. Engineering Structures 22, 2002.
2: Th.W. von Backström, R. Harte, R. Höffer, W.B. Krätzig, D.G. Kröger, H.-J. Niemann, G.P.A.G. van Zijl, "State and Recent Advances in Research and Design of Solar Chimney Power Plant Technology", to appear in PowerTech.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 88 PROCEEDINGS OF THE NINTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: B.H.V. Topping and M. Papadrakakis Paper 234 Safety of Storm-Stressed Thin Reinforced Concrete Shells in Power Industries W.B. Krätzig¹, M. Graffmann², R. Harte³ and U. Montag² ¹Structural Mechanics, Ruhr-University Bochum, Germany ²Krätzig & Partners Consultants, Bochum, Germany ³Structural Mechanics, University of Wuppertal, Germany doi:10.4203/ccp.88.234 purchase the full-text of this paper Full Bibliographic Reference for this paper , "Safety of Storm-Stressed Thin Reinforced Concrete Shells in Power Industries", in B.H.V. Topping, M. Papadrakakis, (Editors), "Proceedings of the Ninth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 234, 2008. doi:10.4203/ccp.88.234 Keywords: cooling towers, solar chimneys, shell structures, wind induced stresses, dynamic instabilities, forced wind vibrations. Summary For nearly a century, natural draft cooling is well established in power generating technology. For this purpose there are large reinforced concrete (RC) shell structures in use, natural draft cooling towers (NDCT), presently with maximum heights of 200 m [1]. In the design state there are planned even higher cooling towers, so-called dry ones, with heights up to 300 m. Future solar chimney power plants (SCPP), which use the natural updraft of sun-heated air for sustainable electricity generation, require shell tower chimneys of over 500 m in height. Presently in the design phase are chimneys of up to 1500 m. All these tower structures are heavily exposed to natural wind actions. They may lead together with dead load, service temperatures and seismic phenomena to severe response effects, like high stresses, structural instabilities and forced storm vibrations. Starting from well known responses of presently largest NDCTs, the paper describes typical response phenomena of those very new solar chimneys. The principle example here is a solar chimney project of 1000 m of height [2]. The paper further emphasizes that some of these phenomena may reduce the safety of the structure considerably, others are merely not recognized to full depth. In a design realization, all have to be treated and accompanied with extreme care. References 1 D. Busch, R. Harte, W.B. Krätzig, U. Montag, "New Natural Draft Cooling Tower of 200m of height", Journ. Engineering Structures 22, 2002. 2 Th.W. von Backström, R. Harte, R. Höffer, W.B. Krätzig, D.G. Kröger, H.-J. Niemann, G.P.A.G. van Zijl, "State and Recent Advances in Research and Design of Solar Chimney Power Plant Technology", to appear in PowerTech. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £145 +P&P)
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