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Engineering Structures 24 (2002) 1015–1025
ate/engstruct
Static, seismic and stability analyses of a prototype wind turbine
steel tower
N. Bazeos, . iou, . Hondros, H. Karamaneas, . Karabalis ∗,
. Beskos
Department of Civil Engineering, University of Patras, 26500 Patras, Greece
Received 11 December 2000; received in revised form 7 February 2002; accepted 8 February 2002
Abstract
Selected results of a study concerning the load bearing capacity and the seismic behavior of a prototype steel tower for a 450 kW
wind turbine with a horizontal power transmission axle are presented. The main load bearing structure of the steel tower rises to
almost 38 m high and consists of thin-wall cylindrical and conical parts, of varying diameters and wall thicknesses, which are linked
together by bolted circular rings. The behavior and the load capacity of the structure have been studied with the aid of a refined
finite element and other simplified models mended by appropriate building codes. The structure is analyzed for static and
seismic loads representing the effects of gravity, the operational and survival aerodynamic conditions, and possible site-dependent
seismic motions. 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. 2002 Published by Elsevier Science Ltd.
Keywords: Wind turbine; Steel tower; Static analysis; Seismic analysis; Stability analysis
1. Introduction opening on the overall structural behavior of the tower
is partly counterbalanced by heavy reinforcement along
This work depicts some critical aspects of the analyses its perimeter as shown in Fig. 2. However, to the best
performed during the design of an almost 38 m high of our knowledge there are no formal analytical pro-
steel tower supporting a prototype 450 kW wind turbine cedures for estimating the effectiveness of s