Macroelement modeling for single vertical piles

Zheng Li (1, 2) , Panagiotis Kotronis (1) , Sandra Escoffier (2) , Claudio Tamagnini (3)

1 GeM - Institut de Recherche en Génie Civil et Mécanique
2 IFSTTAR/GERS/SV - Séismes et Vibrations
3 UNIPG - Università degli Studi di Perugia = University of Perugia

In geotechnical engineering, macro-elements became recently very popular for their simplicity, efficiency and accuracy. This paper presents a new macroelement for single piles in sand (with pile-head on the ground surface) developed within the framework of hypoplasticity. The incremental nonlinear constitutive equations are as usual defined in terms of generalized forces, displacements and rotations. The new macroelement is based on the general approach proposed by Salciarini and Tamagnini (2009) and the concept of “internal displacement” introduced after Niemunis and Herle (1997), necessary for cyclic loadings. After a presentation of the 3D failure envelope of a single pile in sand and the calibration of the macroelement parameters, comparisons with available centrifuge experimental results under static monotonic and cyclic loadings show the performance of this new numerical tool. The proposed macroelement remains simple and computational fast and therefore is suitable for numerical parametric studies and engineering design.

Domaines: Génie civil; Matériaux; Mécanique [physics.med-ph]

Zheng Li, Panagiotis Kotronis, Sandra Escoffier, Claudio Tamagnini. Macroelement modeling for single vertical piles. 6th International Conference on Earthquake Geotechnical Engineering, Nov 2015, Christchurch, New Zealand. ⟨hal-01300379⟩