Validierung eines hochzyklischen Akkumulationsmodells anhand von Modellversuchen und Messungen an realen Bauwerken

Wichtmann, Torsten; Macháček, Jan; Zachert, Hauke; Günther, Helen

doi:10.1002/bate.201800056

Cited by 8 publications

(5 citation statements)

References 39 publications

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“…HCA models are suitable to study arbitrary problems with highcyclic loading. For the prediction of the high-cyclic response of sand, the HCA model by Niemunis et al [55] is well established [39,44,57,63,64,68,79,83]. A corresponding model for clay is missing up to now.…”

Section: Introductionmentioning

confidence: 99%

A high-cycle accumulation model for clay and its application to monopile foundations

et al. 2022

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A high-cycle accumulation (HCA) model predicting the accumulation of permanent strain or excess pore water pressure in clay under a large number of load cycles is presented. Data from an extensive laboratory testing program on kaolin under undrained cyclic loading has been analysed for that purpose. The influence of strain amplitude, void ratio, stress ratio, overconsolidation ratio and loading frequency on the accumulation rates is considered in the constitutive equations of the HCA model. The proposed model is validated first by the simulation of element tests. Subsequently, its application to offshore wind turbine foundations under long-term lateral cyclic loading is presented by the back-analysis of a centrifuge test on a monopile in soft clay. The results are in good accordance with the measurements in terms of pile displacement and bending moment versus number of applied cycles. It is concluded that the proposed model is feasible to describe the long-term behaviour of clay subjected to high-cyclic loading.

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Section: Introductionmentioning

confidence: 99%

A high-cycle accumulation model for clay and its application to monopile foundations

et al. 2022

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“…In order to take into account millions of loading cycles such as encountered for offshore foundations, the high-cycle accumulation (HCA) model by Niemunis et al (2005) has proven suitable in many previous studies (Machaček et al, 2018;Zachert et al, 2020;Zachert, 2015;Wichtmann et al, 2018;Staubach et al, 2020b;Staubach and Wichtmann, 2020;Staubach et al, 2021a;Staubach et al, 2020a;Jostad et al, 2020;Page et al, 2021;Le et al, 2021;Staubach et al, 2022a). In contrast to conventional constitutive models, the HCA model does not predict the material response during individual cycles but only the trend of stress and strain, allowing consideration of a large number of cycles during a calculation increment.…”

Section: The Hca Modelmentioning

confidence: 99%

Long-Term Response of Piles to Cyclic Lateral Loading Following Vibratory and Impact Driving in Water-Saturated Sand

Staubach

Macháček

Bienen

et al. 2022

J. Geotech. Geoenviron. Eng.

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The influence of the pile installation by vibratory or impact driving on the response to subsequent cyclic lateral loading, as faced in the offshore environment, is investigated numerically. Largedeformation analyses of the pile installation process using the Coupled Eulerian-Lagrangian method considering partially drained conditions are performed. Following the installation, one million lateral load cycles are simulated using the high-cycle accumulation (HCA) model. The lower the hydraulic conductivity of the soil during driving, the higher the accumulation of lateral deformation when the pile is subjected to high-cyclic loading. The assumption of ideally drained conditions during pile driving results in a lower accumulation, in particular for the vibratory driven pile. Compared to the influence of the drainage conditions during driving, the influence of the installation method is found to be of less importance. While the vibratory driven piles tend to give less resistance to monotonic lateral loading for most conditions, slightly lower permanent pile head rotations after one million lateral loading cycles are observed compared to the impact driven piles.

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“…18,21 Validation and application of the HCA model for various BVPs can be found elsewhere. 6,[26][27][28][29][30][32][33][34][35]61…”

Section: Constitutive Equationsmentioning

confidence: 99%

Enhancement of a high‐cycle accumulation model by an adaptive strain amplitude and its application to monopile foundations

Staubach

Machačekw

Tschirschky

et al. 2021

Num Anal Meth Geomechanics

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The high-cycle accumulation (HCA) model by Niemunis et al. allows the prediction of the mechanical response of sand under millions of load cycles . It has originally been developed with focus on sand under drained high-cyclic loading assuming a constant strain amplitude, which can be periodically updated. In order to apply it for partially drained or fully undrained conditions, an adaptive definition of the strain amplitude is proposed in this work. The proposed extension allows taking into account the influence of rapid changes in soil stiffness on the strain amplitude as encountered, for example, in case of large changes in effective stress during the high-cyclic loading. Two approaches are presented for the update of the strain amplitude: a 'private' update in each integration point combined with a nonlocal smoothing algorithm and an update in a separate analysis performed parallel to the simulation using the HCA model. Both approaches are compared to the methodology used in previous work employing so-called update cycles. The importance and advantages of the proposed modifications are demonstrated by the simulation of undrained cyclic triaxial tests and monopile foundations for offshore wind turbines (OWTs) under high-cyclic lateral loading and partially drained conditions.

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Validierung eines hochzyklischen Akkumulationsmodells anhand von Modellversuchen und Messungen an realen Bauwerken

Cited by 8 publications

References 39 publications

A high-cycle accumulation model for clay and its application to monopile foundations

A high-cycle accumulation model for clay and its application to monopile foundations

Long-Term Response of Piles to Cyclic Lateral Loading Following Vibratory and Impact Driving in Water-Saturated Sand

Enhancement of a high‐cycle accumulation model by an adaptive strain amplitude and its application to monopile foundations

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