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Design Alternatives for Tall Wind Turbine Towers

Design Alternatives for Tall Wind Turbine Towers . Bin Cai 12/06/2013. Background. Ph.D in progress Structural engineering & WESEP, Iowa State M.S. Wind Engineering, Tongji University, 2013 B.S. Civil Engineering, Xiangtan University, 2010. Reasons for Taller Towers.

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Design Alternatives for Tall Wind Turbine Towers

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  1. Design Alternatives for Tall Wind Turbine Towers Bin Cai 12/06/2013

  2. Background • Ph.D in progress Structural engineering & WESEP, Iowa State • M.S. Wind Engineering, Tongji University, 2013 • B.S. Civil Engineering, Xiangtan University, 2010

  3. Reasons for Taller Towers • Increased demand “20% Wind Energy by 2030” “Significantly taller towers” ,“Design innovation”

  4. Reasons for Taller Towers • Increased demand • Power generated from the wind • the cube of wind velocity • higher elevations, faster and more sustainable winds exist.

  5. Reasons for Taller Towers • Increased demand • Power generated from the wind • More cost effective • capture faster and more sustainable wind • more energy output with fewer total turbines (Brughuis, 2004) (Brughuis, F., MECAL Wind Energy , 2004)

  6. Reasons for Taller Towers • Increased demand • Power generated from the wind • More cost effective • Total cost for 3 MW, 394 ft (120 m) tower is $3,445,150, $551,415 –tower material $195,160 –tower transportation National Renewable Energy Laboratory & LaNier (2005) Picture by Dr. M. Matsui, Tokyo Polytechnic University

  7. Current wind turbine tower designs • Lack of uniformity in tower design why we cannot merely utilize existing building standards? For a 100-m tall tower with a 1.5-5.0 MW turbine: 5.29*108 fatigue load cycles (LaNier, 2005) fatigue of 104 cycles (American building standards, ACI 215R) absence of provisions for high cycle fatigue

  8. Current wind turbine tower designs “BASIC WIND SPEED MAP” ASCE 7-10 Figure 26.5-1A Basic Wind Speeds for Occupancy Category II Buildings and Other Structures.

  9. Current wind turbine tower designs • Transportation concern about steel tower • The diameter of tube section --Width restrictions on roads, highways • Long distance transportation

  10. Current wind turbine tower designs • Fatigue concerns for steel towers a thicker shell would see smaller stress variations, and be less susceptible to fatigue. • 20 years is a common design life (DNV/Risø, 2002).

  11. Current wind turbine tower designs • Concrete towers • Taller towers through modular construction • modules will then be bolted or post-tensioned together to form a complete cross section. ( Grant Schmitz ,2013)

  12. Current wind turbine tower designs • Concrete towers • Less specialized trailers (GrupoInneo, 2008)

  13. Current wind turbine tower designs • Concrete towers • Tower sections connected with post-tensioning enhances the fatigue life of the concrete

  14. Future work • Detail tower design and focus on areas of high complexity such as the yaw bearing, foundation, and column-panel interface connections • Test sections of the tower to ensure the proposed design meets the demand of the loads associated with extreme wind events • Run a computer model to verify the test results

  15. Questions? Thank you!

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