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Estimation of hysteretic soil damping from laboratory measurements including strain accumulation

Løvholt, Finn; Johansson, Jörgen
Research report
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20110087-01-R_main_final.pdf (6.699Mb)
URI
http://hdl.handle.net/11250/2472179
Date
2014-05-12
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  • NGI report [227]
Abstract
The periodic forces due to wind, surface waves and swells on offshore installations

such as offshore wind turbines lead to cyclic motion of the soil foundation. The

damping properties of soils account for a part of the energy dissipation of the

Offshore Wind Turbine (OWT) system. Understanding damping is therefore

important with respect to the structural response and the cost-effective design of

structures. Unfortunately, OWT foundation damping is sparsely studied, and the

understanding of this parameter is therefore limited. The present results provide a

step forwards towards a better understanding and interpretation of stiffness and

damping parameters of soils, and focuses on basic concepts and on the effect of

permanent strain accumulation in particular. Analyses of laboratory data have

shown that the interpreted hysteretic soil damping becomes too large unless the

permanent strain accumulation is filtered out. On the other hand, the strain

accumulation contributes to hysteretic loss in addition to the material damping. The

current study is a first step towards a better understanding and interpretation of

damping parameters for soils, and focuses on basic concepts. A crucial next step

would include methods for interpreting the damping correctly in models soilstructure

interaction for realistic loads and structures, to clarify the importance of

soil damping for offshore wind turbine foundations. Due to the industry’s need for

simple and efficient models used for large scale, it is essential that the damping

formulation is kept simple.
Publisher
Norges Geotekniske Institutt
Series
NGI Rapport;20110087-01-R

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