Schädigungsberechnung an einem Spannbetonschaft für eine Windenergieanlage unter mehrstufiger Ermüdung

Grünberg, Jürgen; Göhlmann, Joachim

doi:10.1002/best.200600492

Cited by 22 publications

(19 citation statements)

References 5 publications

(2 reference statements)

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“…According to [9], it should be mentioned that the status of n i /N f = 1 does not necessarily imply a total lack of material stability. The structure has simply reached the point beyond which the load cannot be carried anymore and the localization of deterioration begins.…”

Section: Fe Model and Simulation Conditions Consideredmentioning

confidence: 99%

“…When the first load cycles are imposed on a young concrete structure, the design results derived from it will be less economical than for an older concrete structure (see also [8] and [9]). …”

Section: Fatigue Of Concretementioning

confidence: 99%

“…A part of the maximum stress in the highly damaged crosssectional area is shifted to the areas with less damage with a higher E-modulus. Based on the research of Prof. Grün-berg, and especially according to [9], the real behaviour of a concrete structure under cyclic fatigue loading will be simulated with the FE model presented in Table 1. The concrete structure examined is a gravity foundation for offshore wind turbines.…”

Section: Fe Model and Simulation Conditions Consideredmentioning

confidence: 99%

“…The definition (Eq. (12)) of the E-modulus variation due to fatigue damage was taken from [9] and is presented in Fig. 3.…”

Section: Fe Model and Simulation Conditions Consideredmentioning

confidence: 99%

“…For example, the real degree of deterioration within a concrete structure with a fatigue risk is in general different to the degree calculated according to code specifications, which use the Palmgren-Miner rule (Eq. (11)) to deal with various load levels (see also [8] and [9]). It is self-evident that the combination of information from monitoring systems and maintenance operations has a positive effect on the realistic assessment of the planned and residual lifetimes of concrete structures.…”

Section: Introductionmentioning

confidence: 99%

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Section: Fe Model and Simulation Conditions Consideredmentioning

confidence: 99%

Section: Fatigue Of Concretementioning

confidence: 99%

Section: Fe Model and Simulation Conditions Consideredmentioning

confidence: 99%

“…The definition (Eq. (12)) of the E-modulus variation due to fatigue damage was taken from [9] and is presented in Fig. 3.…”

Section: Fe Model and Simulation Conditions Consideredmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bei Ermüdungsnachweisen von Betonstrukturen, vor allem im Bereich Offshore, wird die schrittweise Degradation von Materialparametern oftmals nicht berücksichtigt. Eine Auswirkung dieser Schädigung des Materials in Teilbereichen des Betonquerschnitts in Abhängigkeit des Belastungszustands ist eine Spannungsumlagerung innerhalb des Querschnitts und somit die Verlängerung der theoretischen Nutzungsdauer der Betonstruktur. Beton wird in seinen Eigenschaften mithilfe von Materialparametern näher bestimmt. Ein sehr wichtiger Materialparameter ist der E‐Modul, auch Elastizitätskoeffizient genannt. Ein Weg, die Schädigung des Materials in einer FE‐Analyse zu berücksichtigen, ist die schrittweise Anpassung und Minimierung des E‐Moduls. Um ein Bauwerk zu bemessen, seinen internen Spannungsverlauf oder sein Verformungsverhalten vorherzusagen, ist es somit von großer Wichtigkeit, diesen Parameter genau zu bestimmen, seine Veränderung mit der Zeit und aufgrund seiner Belastungshistorie zu kennen. In diesem Beitrag wird zusätzlich zur Robustheits‐ und Redundanz‐Definition auch eine Lebenszeitberechnung des Strabag‐Testfundaments in Cuxhaven nach Model Code 1990 für die geplanten Ermüdungsversuche mit realistisch verändertem E‐Modul ausgeführt. An der Fallstudie Cuxhaven wird mithilfe eines linearen, iterativen Modellbildungsprozesses die Nutzung der Robustheit des Systems für die Verlängerung der verbleibenden Nutzungsdauer gezeigt. Concrete structures under cyclic loading – robustness and redundancy considerations for residual lifetime optimization Concerning fatigue analysis of concrete structures, especially in offshore areas, the continuous degradation of material parameters is not taken into account. One effect of the damaged material structure in parts of the concrete cross section is the stress redistribution from highly loaded (damaged) areas to low loaded (undamaged) areas and therefore an elongation of the theoretical residual service life. Concrete is described by the use of material parameters. A very important parameter is the E‐modulus, also called the modulus of elasticity. A possibility to consider the degradation process within the material concrete is the gradual adaption and minimization of the E‐modulus. In order to analyze and dimension a structure, to predict the internal stress distribution and deflection behavior, it is very important to specify this parameter and to know the variation according loading history and time. In addition to robustness and redundancy definition given in this article, a life time calculation of the Strabag gravity base test foundation in Cuxhaven according Model Code 1990 for the planned fatigue tests with realistic reduction of E‐Modulus is performed. Concerning the case study “Cuxhaven” the use of system robustness in order to extend the residual service life is been demonstrated by means of a linear iterative modeling process.

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Schädigungsberechnung an einem Spannbetonschaft für eine Windenergieanlage unter mehrstufiger Ermüdung

Cited by 22 publications

References 5 publications

Dynamically loaded concrete structures – monitoring‐based assessment of the real degree of fatigue deterioration

Dynamically loaded concrete structures – monitoring‐based assessment of the real degree of fatigue deterioration

Lebensdauerorientierter Entwurf, Konstruktion, Nachrechnung

Zyklisch belastete Betonstrukturen

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