A hypoplastic macroelement model for a caisson foundation in sand under monotonic and cyclic loadings

Abstract

Nowadays, the numerical analysis of caisson foundations of offshore structures is a big challenge in engineering design. A simple, fast and accurate numerical tool is proposed in this article based on the macroelement concept. The novel macroelement is within the framework of hypoplasticity and can consider static monotonic and cyclic combined (multidirectional) loads for a caisson foundation in sand. The incremental nonlinear constitutive formulas are defined in terms of generalised forces and displacements and an enhanced function of failure surface is introduced. A series of well-documented laboratorial reduced-scale 1g model tests are adopted to validate the novel numerical tool. Results demonstrate a satisfied predictive performance of the proposed macroelement that can be used in caisson foundation design and constitutes an alternative to the traditional finite element analysis.

Aktuelle Untersuchungen an Suction Buckets für Offshore‐Windenergieanlagen – das ProBucket‐Projekt

“…Zu den jüngsten Entwicklungen auf dem Gebiet der analyti schen und numerischen geotechnischen Modellierung von BucketFundamenten gehören z. B. Frameworks zur Ermittlung von Interaktionsdiagrammen [16], erweiterte numerische Analysen des statisch und zyklisch horizontal belasteten Fundaments [17] sowie Untersuchungen zur Kontaktfestigkeit bei vertikal drainierter Beanspruchung [18]. In der Geotechnik wurde in den letzten Jahren das axiale Verhalten von BucketFundamenten sowohl in der geotechnischen Zentrifuge als auch unter normalen Schwerkraftbedingungen getestet [19][20][21][22][23][24][25].…”

A Visco-hypoplastic Constitutive Model for Rolled Asphalt

“…Another application of the hypoplastic material model is the work presented by Jin et al [38]. It is used to calculate foundations in sandy soils under monotonic and cyclic loading.…”

Deep Learning-Based Design Model for Suction Caissons on Clay

“…Traditionally, the macro-element model is usually used to model the non-linear load-deflection response of a foundation under threedimensional loads (Ibsen et al, 2014;Villalobos Jara, 2006;Byrne, 2000;Pisanò et al, 2016;Skau et al, 2018a;Yin et al, 2020). For example, Houlsby and Cassidy (2002), Zhang et al (2014) and Wang et al (2021) proposed macro-element models of spudcan for integrated dynamic analysis of the jack-up system; Salciarini and Tamagnini (2009) and Jin et al (2019) proposed macro-element models for shallow foundations, and Li et al (2016) proposed macro-element model for piles. For the suction caisson in undrained clay, Cassidy et al (2006) Taiebat and Carter (2000) Clay 𝑓 = ( ; 𝜆 is the function of the shape of failure envelope; 𝛼, 𝛽 are the fitting parameters of the embedment ratio; 𝑛 1 , 𝑛 2 , 𝑛 3 are the coefficients with respect to the embedment ratio et al (2018b) and Yin et al (2020) also developed different macroelement models based on the traditional plasticity theory, hypoplastic theory or the multi-surface concept.…”