期刊
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
卷 83, 期 -, 页码 62-74出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jcsr.2012.12.016
关键词
Wind turbine tower; Steel shells; Cutout; Stiffening; Buckling; Utimate strength; Nonlinear finite element analysis
资金
- European Union (European Social Fund - ESF)
- Greek National Funds through the Operational Program Education and Lifelong Learning of the NSRF - Research Funding Program: THALES: Reinforcement of the interdisciplinary and/or inter-institutional research and innovation
A very efficient type of wind turbine tower is the tubular steel tower configured as a cantilever cylindrical or conical shell, which is used considerably nowadays. A typical feature of such towers is the presence of a manhole cutout near the bottom. This cutout is of considerable dimensions and lowers significantly the tower strength including stress concentrations and increased danger of local buckling. Therefore, it is common to stiffen the region around the cutout aiming at compensating for this loss of strength. In this paper the most common types of stiffening are investigated by means of nonlinear finite element analyses calibrated via experimental testing and the efficiency of each type is highlighted. It is found that simple stiffening types consisting of either a peripheral frame or two vertical stringers and a ring are particularly efficient and can be used instead of more complex ones. Rules for dimensioning of the stiffeners are also proposed. (C) 2013 Elsevier Ltd. All rights reserved.
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