Building better technology
for the civil engineering industry

Building better technology
for the civil engineering industry

Search

Tel: +44 (0)118 945 3737

Tel: +44 (0)118 945 3737

VJTech Limited Mobile Logo Search

 Login  Register Tel: +44 (0)118 945 3737

 
     
Predicting long term performance of Offshore Wind Turbines using Cyclic Simple Shear

Predicting long term performance of Offshore Wind Turbines using Cyclic Simple Shear

Sep 15 2016

Predicting long term performance of Offshore Wind Turbines using Cyclic Simple Shear

 

A new paper published in the Journal of Soil Dynamics and Earthquake Engineering

VJ Tech in collaboration with the University of Surrey.

Click here to download the paper (Open access version)

Abstract: Offshore wind turbine (OWT) foundations are subjected to a combination of cyclic and dynamic loading arising from wind, wave, 1P (rotor frequency) and 2P/3P (blade passing frequency) loads. Under cyclic/dynamic loading, most soils change their characteristics. Cyclic behaviour (in terms of change of shear modulus change and accumulation of strain) of a typical silica sand (RedHill 110) was investigated by a series of cyclic simple shear tests. The effects of application of 50,000 cycles of shear loading having different shear strain amplitude, cyclic stress ratio (ratio of shear to vertical stress), and vertical stress were investigated. Test results were reported in terms of change in shear modulus against the number of loading cycles. The results correlated quite well with the observations from scaled model tests of different types of offshore wind turbine foundations and limited field observations. Specifically, the test results showed that; (a) Vertical and permanent strain (accumulated strain) is proportional to shear strain amplitude but inversely proportional to the vertical stress and relative density; (b) Shear modulus increases rapidly in the initial cycles of loading and then the rate of increase diminishes and the shear modulus remains below an asymptote. Discussion is carried out on the use of these results for long term performance prediction of OWT foundations.



About VJ Tech

We manufacture and supply soil, concrete, cement, rock and asphalt testing equipment for laboratories around the world from our base in Reading, UK.

VJ Tech equipment has helped to ensure the longevity and safety of major constructions including:

 

  • London’s Canary Wharf, Millennium Dome and Jubilee Line tube extension
  • Malaysia’s iconic Petronas Twin Towers
  • and Dubai’s Palm Islands.

 

 

We also provide associated services including specialist software consultancy and training.

To find out how we could help you, call us on +44 (0)118 945 3737 or email us at Service@vjtech.co.uk.

Website: www.vjtech.co.uk

Total: 0 Comment(s)

Latest Posts

On sample transducers - Sample preparation
4/1/2021 1:57 PM | Irina@vjtech.co.uk
Introduction to Direct Simple Shear (DSS) Testing
1/26/2021 9:45 AM | adrian@vjtech.co.uk
CLISP Studio Release 2.10.1.0
12/16/2020 9:52 AM | adrian@vjtech.co.uk
Clisp Studio 2.9.0.0 Release
10/8/2020 1:54 PM | vasileios@vjtech.co.uk
Introduction to Permeability Testing
9/11/2020 10:23 AM | Irina@vjtech.co.uk

Categories


Archives

2021 Apr 31 1
2021 Jan 293 1
2020 Dec 32 1
2020 Oct 91 1
2020 Sep 2990 1
2020 Jul 1568 2
2020 Apr 105 1
2020 Feb 62 1
2019 Nov 2502 1
2019 Oct 45 1
2019 Jul 91 1
2019 Jun 151 3
2019 May 5329 1
2018 Mar 21527 1
2017 Oct 55217 1
2017 Aug 500 1
2016 Sep 71 1
2016 Aug 97 1
2016 Jul 7 1
2016 May 29 1
2016 Apr 70 1
2016 Mar 38 1
2016 Feb 161 3
2016 Jan 123 1
2015 Dec 35 1
2015 Nov 141 1
2015 May 299 1
2015 Mar 964 4
2015 Feb 791 1
2014 Nov 2600 8
2014 May 532 6
2014 Apr 514 7
2014 Mar 1417 12
2013 Dec 82 1

Tags