Abstract
Singularities in the Mohr–Coulomb (MC) yield criterion create numerical difficulties when implemented in the finite element model (FEM). In this research, a two-dimensional (2D) and a three-dimensional (3D) elasto-plastic FEM coupled with isotropic strain hardening–softening or simple strain-softening law incorporating non-associated flow rule including shear band, is used to investigate the effect of singularities, embedment, shape, soil frictional as well as dilation angle on vertically uploaded shallow anchor foundations buried in Toyoura sand. Mohr–Coulomb–Drucker Prager (MC–DP) model provides a more appropriate solution than Drucker Prager–Drucker Prager (DP–DP) model. Besides, the peak resistance factor and the settlement at the ultimate capacity have been found as the functions of embedment, shape, and sand density. Also, the numerical model gives satisfactory agreement with the previous studies. In particular, a simple strain-softening model cannot capture the settlement behavior of anchor foundations in sand efficiently.
Highlights
Anchors and anchoring system usage techniques are widely used in the world in different fields of civil engineering to resist vertical or horizontal uplift forces or overturning moments acting on the structures, such as transmission towers, sheet piles, retaining walls, deepwater offshore developments, airport hangars, wind loads on tall structures, buoyancy forces on buried underwater pipelines, earthquake, ice forces at different embedment, sizes and shapes [18]
It is observed that MC–DP model, where MC represents yield surface and DP is the potential failure surface, gives better results compared with the Mohr–Coulomb–Mohr–Coulomb (MC–MC), Argyris–Argyris, Drucker Prager–Drucker Prager (DP–DP) material model which proves its appropriateness to use it in this study
The numerical models used in this research work demonstrate their appropriateness to closely predict the experimental uplift resistance–displacement relationships of vertical anchor problems in the sand
Summary
Anchors and anchoring system usage techniques are widely used in the world in different fields of civil engineering to resist vertical or horizontal uplift forces or overturning moments acting on the structures, such as transmission towers, sheet piles, retaining walls, deepwater offshore developments, airport hangars, wind loads on tall structures, buoyancy forces on buried underwater pipelines, earthquake, ice forces at different embedment, sizes and shapes [18]. A numerical study by Walters and Thomas [56], considering the sandbox experiment, have shown that non-associated strain-softening and mobilized dilatancy are important parameters to determine the propagation of localized failure surfaces above trapdoors in the sand In this regard, Sakai and Tanaka [43, 44] simulated the shear band proliferation precisely, in their two-dimensional (2D) anchor using a non-associated strain hardening–softening model with a shear band effect and nonlinear mobilized dilatancy in the elasto-plastic framework. This study focuses on the effect of different approximate models to the exact MC material model in the finite element method, such as DP approximation (Table 1); Argyris et al [2]; and rounding parameter (lode angle) on the anchor (Fig. 4). Parametric study The effect of embedment, shape, frictional, and dilatation angle on the pullout capacity of circular or rectangular anchor foundations buried in the sand of different densities have been studied through model tests and extensive FEM analysis.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
