A model for nonlinear hysteretic and ratcheting behaviour

Houlsby, G. T.; Abadie, Christelle N.; Beuckelaers, William J. A. P.; Byrne, Byron W.

doi:10.1016/j.ijsolstr.2017.04.031

Cited by 65 publications

(57 citation statements)

References 19 publications

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“…The paper outlines experimental methods that can be used for identifying key mechanisms for the development of appropriate constitutive models. Such models, applied to as a macro-element for monopile response, are explored in detail in Abadie (2015) and Houlsby et al (2017). The work described here was completed at model scale to explore phenomenological behaviour.…”

Section: Discussionmentioning

confidence: 99%

“…the horizontal force applied, the displacement at ground level, the rotation, and the parameters that can be derived from these macro variables (moment at ground level, tangent and secant stiffness and dissipated energy in particular). The macro-behaviour was the focus of theoretical developments as described in Abadie (2015) and Houlsby et al (2017).…”

Section: Testing Equipmentmentioning

confidence: 99%

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Rigid pile response to cyclic lateral loading: laboratory tests

2019

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This paper presents experimental work aimed at improving understanding of the behaviour of rigid monopiles, in cohesionless soils, subjected to lateral cyclic loading. It involves 1g laboratory model tests, scaled to represent monopile foundations for offshore wind turbines. The test programme is designed to identify the key mechanisms governing pile response, and is divided into four main parts: (a) investigation of loading rate effects; (b) hysteretic behaviour during unloading and reloading; (c) pile response due to long-term single-amplitude cyclic loading; and (d) multi-amplitude cyclic loads. The results show that the pile response conforms closely to the extended Masing rules, with additional permanent deformation accumulated during non-symmetric cyclic loads. This ratcheting behaviour is characterised by two features: first, the ratcheting rate decreases with cycle number and depends on the cyclic load magnitude, and second, the shape of the hysteresis loop tightens progressively, involving increased secant stiffness and decreased loop area. Test results involving multi-amplitude load scenarios demonstrate that the response of the pile to complex load scenarios can be analysed and understood using the conclusions from single-amplitude cyclic loading. Such test results should be sufficient for deriving the principles of new modelling approaches.

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Section: Discussionmentioning

confidence: 99%

Section: Testing Equipmentmentioning

confidence: 99%

Rigid pile response to cyclic lateral loading: laboratory tests

2019

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“…An example calibration of the AF model is described by Lemaitre and Chaboche [6]. Houlsby et al [3] provide a review of the AF model, and the discuss the rationale for not pursuing such methodology further, in particular for the case where the cyclic loading response conforms approximately to the extended Masing rules [9], while accumulating permanent ratcheting strain under cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

“…Houlsby et al [3] present a new approach for modelling of ratcheting in a computationally efficient way, called the HARM model (Hyperplastic Accelerated Ratcheting Model). This model addresses the challenging issue of capturing accumulation of ratcheting strain with cycle number for a large number of cycles, while conforming approximately to the extended Masing rules [9].…”

Section: Introductionmentioning

confidence: 99%

A method for calibration of the Hyperplastic Accelerated Ratcheting Model (HARM)

Abadie

Houlsby

Byrne

2019

Computers and Geotechnics

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This paper presents an analytical methodology for calibration of the Hyperplastic Accelerated Ratcheting Model (HARM) [3], based on a closed-form expression for the accumulation of ratcheting strain with cyclic history. The proposed method requires the fit of one test response and of a few continuous cyclic tests. The initial motivation for this work is the calibration of models for the design of piles subjected to longterm cyclic lateral loading, and the test results from Abadie, Byrne [1], [2] are used for calibration and proofing of the model. Nevertheless, the method is applicable to other problems of similar behaviour.

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“…More specifically, cyclic accumulation of permanent strain and pore water pressure may lead to reduction of capacity, serviceability and fatigue resistance (Andersen 2015). The term 'ratcheting' is adopted to denote the gradual accumulation of plastic strains under loading cycles (Houlsby et al 2017). In engineering practice, soil ratcheting is often described by using empirical equations derived from experimental measurements (Pasten et al 2013).…”

Section: Introductionmentioning

confidence: 99%