Effect of loading conditions and stress history on cyclic behavior of Kutch soil

Hussain, Majid; Sachan, Ajanta

doi:10.1080/17486025.2019.1635716

Cited by 9 publications

(2 citation statements)

References 28 publications

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“…Moreover, it can be seen that the damping ratio decreases owing to soil densification due to the cyclic loads. This decrease is large in the early cycle and then reduces, which agrees with the results of [23]. In particular, in the case of the large loading tests (ULS and 1.35ULS), there is a large difference in rotation displacement due to the change in damping ratio.…”

Section: Rotationsupporting

confidence: 87%

“…From the figure, it can be seen that as the loading amplitude increases, the initial rotational stiffness (kL(0)) of the foundation tends to decrease relative to the loading magnitude due to the soil nonlinearity [22]. Hussain and Sachan [23] discussed the effect of the cyclic loading amplitude on the dynamic properties (i.e., shear modulus and damping ratio) of the SM from the results of extensive cyclic triaxial tests. They found that the strain amplitude significantly affects both the shear modulus and the damping ratio.…”

Section: Rotationmentioning

confidence: 99%

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Centrifuge Modeling for the Evaluation of the Cyclic Behavior of Offshore Wind Turbine with Tripod Foundation

2021

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In this study, the cyclic responses of an offshore wind turbine with a tripod foundation installed on an actual site were evaluated in a centrifuge. To understand the behavior of the turbine at the site, the site soil conditions, environmental loads, and real offshore wind turbine structure installed at the actual site were modeled by considering the centrifuge scaling law. From a series of cyclic loading tests, the cyclic responses of the tripod foundation were evaluated in terms of temporary/permanent displacements and cyclic stiffness. Moreover, the long-term behavior of the tripod foundation was predicted from the experimental results. The test results showed that the initial stiffness of the soil–foundation system decreased as the loading amplitude increased and that the stiffness increased with the number of cycles due to soil densification. The findings revealed that the cyclic behaviors of the tripod were more affected by the load amplitude than the number of cycles. In addition, the permanent rotation increased logarithmically with the number of cycles. A simple method to predict the displacement and change in the foundation stiffness of the actual wind turbine is proposed based on the results of the model tests. The results of this study also provide key insights into the long-term cyclic behavior of tripod foundations for offshore wind turbines.

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Section: Rotationsupporting

confidence: 87%

Section: Rotationmentioning

confidence: 99%