Torsional load-bearing capacity of half-shell segments for prestressed concrete towers

Klein, Fabian; Marx, Steffen

doi:10.1016/j.engstruct.2021.112589

Cited by 12 publications

(4 citation statements)

References 29 publications

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“…For the segmental design, individual concrete rings or half or quarter shells are first prefabricated as precast elements in concrete plants. 5,6 At the construction site, the segments are form-and force-fit connected to each other according to von der Haar and Marx. 7 This can significantly reduce the transport effort to the installation site of the wind turbines.…”

Section: State Of the Art 21 | Hybrid Towersmentioning

confidence: 99%

“…The lower part of the hybrid towers is manufactured in modular construction. For the segmental design, individual concrete rings or half or quarter shells are first prefabricated as precast elements in concrete plants 5,6 . At the construction site, the segments are form‐ and force‐fit connected to each other according to von der Haar and Marx 7 .…”

Section: State Of the Artmentioning

confidence: 99%

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Experimental study on the joint bearing behavior of segmented tower structures subjected to normal and bending shear loads

Klein

Fürll

Betz

et al. 2022

Structural Concrete

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This article deals with the analysis and evaluation of the structural behavior of segmented tower constructions in large-scale experimental investigations. For this purpose, a tower model with dry horizontal joints on a scale of approximately 1:10 is constructed and loaded. The objective of these large-scale investigations is to determine the load-bearing behavior of concrete segment towers subjected to normal force (external prestressing), bending, shear force and torsion and to derive more efficient and realistic design models. The transfer of shear stresses between individual segments is ensured by frictional resistance in the horizontal joints due to prestressing. The current design models are based on plane flange surfaces at the top and bottom of the segments as well as their ideal circular ring shape. This assumes a constant normal stress distribution for the compression connection. Within the large-scale experimental tests, findings for uneven force distribution in the horizontal joints due to prestressing and shear bending were obtained, that have a significant impact on the design models. However, for the evaluation of the results and the projection onto the real construction components, the scale effects must be urgently taken into account.

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Section: State Of the Art 21 | Hybrid Towersmentioning

confidence: 99%

Section: State Of the Artmentioning

confidence: 99%

Experimental study on the joint bearing behavior of segmented tower structures subjected to normal and bending shear loads

Klein

Fürll

Betz

et al. 2022

Structural Concrete

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“…Dazu werden Betonfertigteilringe bzw. Halb‐, Drittel‐ oder Viertelschalen [2, 3] übereinandergestapelt und mittels im Turminneren verlaufenden externen Spanngliedern miteinander verbunden [4]. Die so zwangsläufig entstehenden Horizontalfugen im Turm werden üblicherweise als Trockenfugen ausgeführt.…”

Section: Motivation Der Untersuchungenunclassified

Einfluss von Imperfektionen auf die Fugentragfähigkeit torsionsbeanspruchter Kreisringsegmente

Fürll

Klein

Betz

et al. 2022

Beton und Stahlbetonbau

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Hybride Turmkonstruktionen für Windenergieanlagen haben sich in den letzten Jahren vor allem für Anlagen mit großen Nabenhöhen etabliert. Der obere Teil derartiger Türme besteht aus Stahlsektionen, wohingegen sich der untere Teil aus vorgespannten Betonfertigteilringen zusammensetzt. Die zwangsläufig zwischen den Betonfertigteilen entstehenden Horizontalfugen werden üblicherweise als Trockenfugen ausgeführt. Aufgrund der fehlenden Ausgleichsschicht in der Fuge entstehen erhöhte Anforderungen an die Genauigkeit der Fugenoberflächen. Aus Messdaten von realen Segmenten von Windenergieanlagen konnte abgeleitet werden, dass die Fugenoberflächen Ungenauigkeiten hinsichtlich der Querschnittsform und Ebenheit aufweisen. Mittels numerischer Simulationen wurde der Einfluss dieser Imperfektionen auf das Fugentragverhalten unter kombinierter Belastung aus Vorspannung, Biegung und Torsion untersucht. Es zeigt sich, dass in Abhängigkeit von der Imperfektionsart und vom Vorspanngrad Imperfektionen das Fugentragverhalten erheblich beeinflussen können.

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“…Klein discusses the torsional load-bearing behavior of concrete half-shell structures, and the analogy between a flexurally stressed tensile member and a torsional member with a warpedresisted cross-section according to second-order theory leads to a significant simplification of the calculation of the additionally occurring warping stress. This eliminates the need for the laborious solution of the complex differential equations of classical torsional warping theory to determine the load-bearing behavior of warped cross-sections 6 . Sarir applies several artificial intelligence (AI) techniques to optimize the load-bearing capacity of concrete-filled-filled steel (CFST) columns.…”

Section: Introductionmentioning

confidence: 99%

Automatic testing system for ceramsite concrete bearing capacity based on genetic algorithm

Liu

Xue

Zhao

et al. 2023

International Conference on Computer Application and Information Security (ICCAIS 2022)

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At present, the research work on recycled concrete is still relatively slow and backward, and many problems are not studied in detail enough. It only stays at the material level, and there is no in-depth research on the performance of recycled concrete structures. The purpose of this paper is to study the automatic testing system of ceramsite concrete bearing capacity based on genetic algorithm. A prediction model for the flexural and shear resistance of RC beams after high temperature, and the bearing capacity of RC columns after high temperature, based on BP neural network and GA-BP neural network, was established to prove the effectiveness and efficiency of the automatic test system based on ceramsite concrete bearing capacity accuracy. The overall structure of the system is analyzed, and the following conclusions are obtained: Compared with the BP neural network prediction model, the flexural and shear bearing capacity of the RC beam based on the GA-BP neural network after high temperature and the axial compression of the RC column after high temperature are analyzed. The relative error, absolute error, average error and root mean square of the predicted data obtained by the bias bearing capacity prediction model and the theoretical calculation value are smaller.

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Torsional load-bearing capacity of half-shell segments for prestressed concrete towers

Cited by 12 publications

References 29 publications

Experimental study on the joint bearing behavior of segmented tower structures subjected to normal and bending shear loads

Experimental study on the joint bearing behavior of segmented tower structures subjected to normal and bending shear loads

Einfluss von Imperfektionen auf die Fugentragfähigkeit torsionsbeanspruchter Kreisringsegmente

Automatic testing system for ceramsite concrete bearing capacity based on genetic algorithm

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