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Delegates are invited to meet and discuss with the poster presenters during the poster presentation sessions between 10:30-11:30 and 16:00-17:00 on Thursday, 19 November 2015.

Lead Session Chair:
Stephan Barth, ForWind - Center for Wind Energy Research, Germany
Saeed Reza Massah Iran University of Science and Technology, Iran, Islamic Republic of
Co-authors:
Saeed Reza Massah (1) F Mehdi Zamani (1)
(1) Iran University of Science and Technology, Tehran, Iran, Islamic Republic of (2) Iran University of Science and Technology, Tehran, Iran, Islamic Republic of

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Presenter's biography

Biographies are supplied directly by presenters at EWEA 2015 and are published here unedited

Dr. Massah has been working in the design of special steel structures for almost 20 years. He is currently an assistant professor at the Department of Civil Engineering, Iran University of Science and Technology. He studied structural engineering at the Universities of Texas A&M, University of Mississippi, and Mississippi State University. His special fields of interest are:
Tall Buildings, Design Concepts and Philosophies; Seismic Behavior of Special Structures; Linear and Nonlinear Finite Element Methods of Analysis; Seismic, Static and Dynamic, Analysis of Structures; Analysis and Design of Large Steel and Concrete Building Structures.


Poster

Poster Download poster (14.88 MB)

Abstract

Investigating the Behavior of Steel Wind Turbine Towers Subject to Seismic Loads

Introduction

Wind, and solar are two emerging renewable sources of clean energy. Renewable energy is generally defined as energy that comes from resources which are naturally replenished on a human timescale such as sunlight, wind, rain, tides, waves and geothermal heat. In this study we will focus on generating energy from wind power. Modern utility-scale wind turbines range from around 600 kW to 5 MW of rated power, although turbines with rated output of 1.5–3 MW have become the most common for commercial use.


Approach

Twenty accelerogram records from variety of strong worldwide events are selected for dynamic time history analysis of the towers. To better capture the actual behavior of these towers, five different soil types have been considered; in addition, the earthquake records are divided into three groups of near-field, mid-field, and far field accelerogram record.
To enhance the analytical results, the two horizontal earthquake components and the vertical component of each record are simultaneously applied to each tower.


Main body of abstract

The power available from the wind is a function of the cube of the wind speed, so as wind speed increases, power output increases up to the maximum output for the particular turbine. Thus, to obtain higher efficiency out of these systems, the tendency for design and construction of taller towers becomes more rationale. Therefore, the structural stability of these towers becomes not only a function of their ability to withstand the operational loadings but also to simultaneously resist the lateral forces exerted on these towers such as wind loadings and/or seismic loadings.
Due to seismic hazards existing in many parts of the world, the design and construction of wind turbine towers in areas of high seismicity requires a thorough investigation. Therefore, in this study the structural behavior of wind turbine towers, with varying heights of 65m to 156m and generating electric power capacities of 750KW to 5MW, are investigated when subjected to strong earthquake loadings. At the end, important seismic parameters for wind turbine towers will be discussed and compared.



Conclusion

The structural design of wind turbine towers under the effect of real loading conditions is studied. Soil class and earthquake intensity due to distance from epicenter are investigated. Safe design and construction of these towers are important for industry.


Learning objectives
Various seismic parameters that can affect the structural design of wind turbine towers will be disused. Different wind loadings that are mandatory and are the basis for wind design of towers will be presented and the results obtained from the seismic and wind loading will be compared. Also, the importance of simultaneous consideration of both seismic and wind loads in a single loading combination will be discussed.