Accumulated Rotations of Suction Bucket Foundations under Long-term Cyclic Loads in Dry Sandy Ground

Abstract After the collapse of some heavy buildings and towers in Italy and elsewhere, the hypothesis of possible continuous damage to these structures due to the dead weight and cyclic loads (wind, temperature variations, etc.) has been formulated by the authors. The long term behaviour of historic masonry has also been detected by laboratory creep and cyclic tests. The results indicate that a laboratory and on site investigation together with analytical modelling are important particularly for tall bell-towers. The application of these procedures on the Bell-Tower of the Cathedral of Monza is here reported and discussed

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The pore pressure and deformation behavior of natural soft clay caused by long-term cyclic loads subjected to traffic loads

Marine Georesources and Geotechnology ◽

10.1080/1064119x.2019.1707915 ◽

2020 ◽

pp. 1-10 ◽

Cited By ~ 1

Author(s):

Yuke Wang ◽

Yongshuai Wan ◽

Ershuai Wan ◽

Xijun Zhang ◽

Bei Zhang ◽

...

Keyword(s):

Pore Pressure ◽

Deformation Behavior ◽

Soft Clay ◽

Cyclic Loads ◽

Traffic Loads

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Dynamic performance of shear-thickening fluid damper under long-term cyclic loads

Smart Materials and Structures ◽

10.1088/1361-665x/aaf079 ◽

2018 ◽

Vol 28 (2) ◽

pp. 025007 ◽

Cited By ~ 8

Author(s):

Kun Lin ◽

Hongjun Liu ◽

Minghai Wei ◽

Annan Zhou ◽

Fanrui Bu

Keyword(s):

Dynamic Performance ◽

Shear Thickening ◽

Cyclic Loads ◽

Shear Thickening Fluid ◽

Fluid Damper

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A Simplified Method to Predict the Steady Cyclic Stress State of Creeping Structures

Journal of Applied Mechanics ◽

10.1115/1.1430234 ◽

2001 ◽

Vol 69 (2) ◽

pp. 148-153 ◽

Cited By ~ 5

Author(s):

K. V. Spiliopoulos

Keyword(s):

Fourier Coefficients ◽

Numerical Procedure ◽

Cyclic Stress ◽

Cyclic Loads ◽

The Finite Element Method ◽

Time Points ◽

State Of Stress ◽

Short Period ◽

Simplified Method

Simplified methods have been developed to find the long-term cyclic state of stress for structures that exhibit inelastic creep and are subjected to a short period cyclic loading. In the present work a new simplified method is presented which may be applied to cyclic loads having any period. The method is based on decomposing the residual stress in Fourier series. The various Fourier coefficients are computed, in an iterative way, by satisfying equilibrium and compatibility at a few time points inside the cycle. The whole numerical procedure is formulated within the finite element method and examples of various structures are presented.

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Undrained pore pressure behavior of soft marine clay under long-term low cyclic loads

Ocean Engineering ◽

10.1016/j.oceaneng.2017.12.045 ◽

2018 ◽

Vol 150 ◽

pp. 60-68 ◽

Cited By ~ 9

Author(s):

Xing-Wei Ren ◽

Qi Xu ◽

Cheng-Bo Xu ◽

Ji-Dong Teng ◽

Sheng-Hua Lv

Keyword(s):

Pore Pressure ◽

Cyclic Loads ◽

Marine Clay ◽

Pressure Behavior

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Cyclic behaviour of plate anchors

Canadian Geotechnical Journal ◽

10.1139/t88-038 ◽

1988 ◽

Vol 25 (2) ◽

pp. 374-381 ◽

Cited By ~ 8

Author(s):

D. A. Ponniah ◽

T. W. Finlay

Keyword(s):

Key Words ◽

Pore Pressure ◽

Cohesive Soil ◽

Cyclic Loads ◽

Cyclic Testing ◽

Cyclic Behaviour ◽

Pull Out ◽

The Mean ◽

Plate Anchors

This note describes a series of tests carried out on plate anchors embedded in a normally consolidated cohesive soil and subjected to long-term cyclic loads. The principle parameters in the cyclic testing were the mean load and the cyclic amplitude of load about the mean. The tests demonstrated that the anchors did not fail when load cycled up to 50 ± 20% of the drained ultimate pull-out capacity, with the anchor displacements being associated with the buildup and dissipation of pore pressure. With recycling, the level of loading without failure could be increased to 70 ± 20% of the drained capacity. Key words: anchors, cycling, clay.

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Experimental Study on Whole Wind Power Structure with Innovative Open-Ended Pile Foundation under Long-Term Horizontal Loading

Sensors ◽

10.3390/s20185348 ◽

2020 ◽

Vol 20 (18) ◽

pp. 5348

Author(s):

Junwei Liu ◽

Zhipeng Wan ◽

Xingke Dai ◽

Dongsheng Jeng ◽

Yanping Zhao

Keyword(s):

Wind Power ◽

Dynamic Characteristics ◽

Pile Foundation ◽

Large Diameter ◽

Offshore Wind ◽

Cyclic Loads ◽

Loading Frequency ◽

Soil System ◽

Comparison Results

The offshore wind energy (OWE) pile foundation is mainly a large diameter open-ended single pile in shallow water, which has to bear long-term horizontal cyclic loads such as wind and waves during OWE project lifetime. Under the complex cyclic loads, the stress and displacement fields of the pile-soil system change continuously, which affects the dynamic characteristics of the pile foundation. Within the service life of the pile foundation, the pile-soil system has irreversible cumulative deformation, which further causes damage to the whole structure. Therefore, it is important to examine the overall dynamic characteristics of wind power foundation under high cycle. In this paper, in the dry sand foundation, taking the Burbo Bank 3.6 MW offshore turbine-foundation structure as the prototype, the horizontal cyclic loading model tests of the wind power pile foundation with the scale of 1:50 were carried out. Considering the factors such as loading frequency and cyclic load ratio, the horizontal dynamic characteristics of the whole OWE pile foundation are studied. The comparison results between the maximum bending moment of pile and the fitting formula are discussed. In conclusion, moment of OWE pile shaft is corresponding to the loading frequency (f = 9 HZ) and loading cycles by fitting formulas. The fatigue damage of the OWE pile does not occurs with low frequencies in high cycles.

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