Title:	Effects of concrete compressive strength and thickness onthenatural frequency of a prestressed concrete wind tower
Authors:	Borges, Luana Ferreira Lameiras, Rodrigo de Melo
metadata.dc.contributor.affiliation:	University of Brasília, Department of Civil and Environmental Engineering University of Brasília, Department of Civil and Environmental Engineering
Assunto::	Frequências naturais Torres eólicas de concreto Análise modal Turbinas eólicas
Issue Date:	Feb-2026
Publisher:	SCHOLINK INC.
Citation:	BORGES, Luana Ferreira; LAMEIRAS, Rodrigo de Melo. Effects of concrete compressive strength and thickness onthenatural frequency of a prestressed concrete wind tower. Sustainability in Environment, [S. l.], v. 11, n. 1, 2026. DOI: https://doi.org/10.22158/se.v11n1p168. Disponível em: https://www.scholink.org/ojs/index.php/se/article/view/57119. Acesso em: 17 mar. 2026.
Abstract:	In wind tower design, the natural frequency must remain within a safe working range to avoid resonance. This study investigates the effects of concrete thickness and compressive strength on the first natural frequency of a 100 m prestressed concrete tower supporting a 5 MW turbine. Sixty-four models were analyzed using finite element modal analysis. The tower was modeled using 4 m Class 1 3D Bernoulli beam segments, each subdivided into ten elements, and the turbine was represented by a concentrated mass at the top. Two studies were conducted for concrete classes C30, C40, C50, and C60: one varying both base and top thickness (study 1), and another varying only the base thickness (study 2). For a given concrete class, increasing thickness resulted in a higher natural frequency, but with decreasing impact as thickness grew, indicating a tendency toward stabilization. Likewise, higher concrete strength increased the natural frequency, although the effect diminished at higher strength levels. For all geometries, the natural frequencies relative to C50 were 85.6% for C30, 93.3% for C40, and 103.9% for C60.
metadata.dc.description.unidade:	Faculdade de Tecnologia (FT) Departamento de Engenharia Civil e Ambiental (FT ENC)
Licença::	(CC-BY) This work is licensed under a Creative Commons Attribution 4.0 International License.
DOI:	https://doi.org/10.22158/se.v11n1p168
Appears in Collections:	Artigos publicados em periódicos e afins

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