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FOUNDATIONS FOR WIND TURBINES

FOUNDATIONS FOR WIND TURBINES ENGR 340 Fall 2011 Jeramy C. Ashlock Assistant Professor, CCEE Vern Schaefer Professor, CCEE OUTLINE Topics Lecture # Design requirements, Foundation types 1 Overview of geotechnical engineering Soil mechanics Site investigations In-situ tests Laboratory tests 1 & 2 FOUNDATIONS for wind TURBINES , Design example 2 2 TURBINE FOUNDATION LOADS Vertical, shear forces and significant overturning moments are transmitted to foundation by tower Must be resisted within tolerances for foundation settlement and tilt Manufacturers typically specify horizontal and rotational foundation stiffness criteria Loading direction changes with wind direction and nacelle orientation Circular foundation shape is therefore optimal, but straight-sided ( octagonal, hexagonal) is easier to construct Anchors can be used to add rotational strength

FOUNDATIONS FOR WIND TURBINES ENGR 340 – Fall 2011 Jeramy C. Ashlock Assistant Professor, CCEE Vern Schaefer Professor, CCEE . OUTLINE Topics Lecture # Design requirements, Foundation types 1 Overview of geotechnical engineering •Soil mechanics •Site investigations •In-situ tests •Laboratory tests 1 & 2 Foundations for wind turbines,

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