Centrifuge modelling of screw piles for offshore wind energy foundations

Abstract

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A finite element approach for determining the full load–displacement relationship of axially loaded shallow screw anchors, incorporating installation effects

“…In summary, the centrifuge results obtained at the University of Dundee and presented in (Davidson et al 2019) are be er approximated by a conical shallow failure mechanism while a cylindrical failure mechanism gives a be er approxima on of the results for the numerical simula ons of Pérez et al (2018). These two possibili es are not necessarily mutually exclusive.…”

“…For the HST95 sand, it is approximately 7.5% as in (Al-Defae et al 2013), or approximately 15% from triaxial tests (Robinson 2016). For the cases presented herein, this threshold strain was assumed equal to be 10% for the HST95 sand used by Davidson et al (2019) and it was assumed iden cal for applica on to the results of (Hao et al 2018) as no specific element test results for this case were available. The distance over which a shear strength corresponding to the cri cal state parameter can then be iden fied by inspec on of the shear strain contour in the FE so ware.…”

“…Numerical results are validated against two sets of small-scale centrifuge tests undertaken at the University of Dundee (UoD) (Davidson et al 2019) and the University of Western Australia (UWA) (Hao et al 2018), both in dense sand.…”

“…The tests undertaken at the University of Dundee, extensively described in (Davidson et al 2019) incorporate the installa on effect. Three screw anchors were installed in a very dense sand (referred to as VD, D r = 84% on average) and one in a medium dense sand (MD, D r = 57%).…”

“…The upli capacity of shallow screw anchors was inves gated by Davidson et al (2019) through centrifuge tes ng in medium-dense and dense sand. The centrifuge upli capaci es were compared with results published in the literature, as shown in Figure 1.…”