Model tests on offshore monopile subjected to lateral monotonic and cyclic loading

2013 ◽  
pp. 553-559
Author(s):  
B Zhu ◽  
Y Sun ◽  
R Chen ◽  
Y Chen
Keyword(s):  
Cyclic Loading ◽  
Model Tests

Model tests of single pile vertical cyclic loading in calcareous sand

2020 ◽  
pp. 1-12 ◽  
Author(s):  
Shuai Wang ◽  
Xuewen Lei ◽  
Qingshan Meng ◽  
Jieli Xu ◽  
Mingzhao Wang ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Model Tests ◽  
Single Pile ◽  
Calcareous Sand

Drift of Piles Subjected to Cyclic Lateral Loading From a Varying Direction: System vs. Soil Element Behavior

2014 ◽  
Author(s):  
Christina Rudolph ◽  
Jürgen Grabe ◽  
Britta Bienen
Keyword(s):  
Cyclic Loading ◽  
Model Tests ◽  
Small Scale ◽  
Shear Tests ◽  
Centrifuge Testing ◽  
Scale Modeling ◽  
Highly Sensitive ◽  
Number Of Cycles ◽  
Laterally Loaded ◽  
Insight Into

Offshore monopiles are usually designed using the p-y method for cyclic loading. While the method works for static loading, it was not developed for high numbers of cycles. Since the turbines are highly sensitive towards tilting, cyclic loading must be considered. The static results should therefore be combined with results from cyclic model tests with a high number of cycles to account for the accumulation of displacement or rotation during the lifetime of these structures. These model tests can underestimate the accumulation, however, as it has recently been shown that a change of loading direction can increase the accumulation considerably. These results have been verified using small scale modeling and centrifuge testing. The results from modeling the full problem of a laterally loaded pile are compared here with results from cyclic simple shear tests with a change of shearing direction during the cyclic loading. For these tests, a newly developed apparatus is used. This allows further insight into the question how a soil can “retain a memory” of its loading history.

Model tests on bearing capacity and accumulated settlement of a single pile in simulated soft rock under axial cyclic loading

2017 ◽  
Vol 12 (4) ◽  
pp. 611-626 ◽  
Author(s):  
Benjiao Zhang ◽  
Can Mei ◽  
Bin Huang ◽  
Xudong Fu ◽  
Gang Luo ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Bearing Capacity ◽  
Soft Rock ◽  
Model Tests ◽  
Single Pile ◽  
Axial Cyclic Loading

Comparative study of the effective parameters on residual stress relaxation in welded aluminum plates under cyclic loading

2020 ◽  
Vol 21 (5) ◽  
pp. 505
Author(s):  
Yousef Ghaderi Dehkordi ◽  
Ali Pourkamali Anaraki ◽  
Amir Reza Shahani
Keyword(s):  
Residual Stress ◽  
Cyclic Loading ◽  
Stress Relaxation ◽  
Stress Amplitude ◽  
Cyclic Plasticity ◽  
Mean Stress ◽  
Effective Parameters ◽  
Perfect Plasticity ◽  
Residual Stress Relaxation ◽  
Aluminum Plates

The prediction of residual stress relaxation is essential to assess the safety of welded components. This paper aims to study the influence of various effective parameters on residual stress relaxation under cyclic loading. In this regard, a 3D finite element modeling is performed to determine the residual stress in welded aluminum plates. The accuracy of this analysis is verified through experiment. To study the plasticity effect on stress relaxation, two plasticity models are implemented: perfect plasticity and combined isotropic-kinematic hardening. Hence, cyclic plasticity characterization of the material is specified by low cycle fatigue tests. It is found that the perfect plasticity leads to greater stress relaxation. In order to propose an accurate model to compute the residual stress relaxation, the Taguchi L18 array with four 3-level factors and one 6-level is employed. Using statistical analysis, the order of factors based on their effect on stress relaxation is determined as mean stress, stress amplitude, initial residual stress, and number of cycles. In addition, the stress relaxation increases with an increase in mean stress and stress amplitude.

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