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Cyclic axial response and stability of snakeskin-inspired piles in sand
https://orcid.org/http://orcid.org/0000-0003-4649-925X
Piles subjected to cyclic axial loading can experience loss of serviceability due to accumulation of excessive deformations, which is a common failure mode for offshore foundations. This investigation examines the cyclic behavior of piles with snakeskin-inspired textures that exhibit a direction-dependent shearing and volume change response. Centrifuge pile load tests were performed on three piles with snakeskin-inspired surfaces, one which was cranially installed and caudally pulled and two with asperities of varying height which were caudally installed and cranially pulled. Tests were also performed on a reference rough pile and a reference smooth pile. The experiments performed at an acceleration equivalent to 30 g investigated the effect of the surface texture on the capacity, load transfer, and cyclic behavior of the piles. Following in-flight installation of the piles, the load-controlled cyclic load tests performed with various combinations of mean and cyclic loads show that the cranially pulled piles failed in a smaller number of cycles due to the accumulation of deformations in the compressive, caudal stage of the cycles. However, failure of the caudally pulled pile was more brittle, with fewer cycles between yielding and failure in comparison to the cranially pulled piles. Cycling led to greater degradation of the local shaft capacity of the cranially pulled piles, resulting in a greater proportion of the head load being carried by the pile base in compression. The evolution of global pile stiffness was not influenced by the surface texture; it was found to depend on the ratio of the mean to cyclic load, with larger ratios leading to increases in stiffness. Analysis using stability diagrams shows that in terms of absolute loads, the cranially pulled piles are stable over a larger range of mean and cyclic loads. However, the caudally pulled piles have larger regions of stability in terms of the mean and cyclic loads normalized by the corresponding pile capacity. The post-cyclic tensile capacity decreased as the cyclic load magnitude was increased for all piles, and the cranially pulled piles mobilized greater post-cyclic tensile capacities. The results provide evidence of the effect that bioinspired surface textures can have on the stability of piles and show the tradeoffs that emerge due to the direction-dependent shaft resistance mobilization.
Cyclic axial response and stability of snakeskin-inspired piles in sand
https://orcid.org/http://orcid.org/0000-0003-4649-925X
Piles subjected to cyclic axial loading can experience loss of serviceability due to accumulation of excessive deformations, which is a common failure mode for offshore foundations. This investigation examines the cyclic behavior of piles with snakeskin-inspired textures that exhibit a direction-dependent shearing and volume change response. Centrifuge pile load tests were performed on three piles with snakeskin-inspired surfaces, one which was cranially installed and caudally pulled and two with asperities of varying height which were caudally installed and cranially pulled. Tests were also performed on a reference rough pile and a reference smooth pile. The experiments performed at an acceleration equivalent to 30 g investigated the effect of the surface texture on the capacity, load transfer, and cyclic behavior of the piles. Following in-flight installation of the piles, the load-controlled cyclic load tests performed with various combinations of mean and cyclic loads show that the cranially pulled piles failed in a smaller number of cycles due to the accumulation of deformations in the compressive, caudal stage of the cycles. However, failure of the caudally pulled pile was more brittle, with fewer cycles between yielding and failure in comparison to the cranially pulled piles. Cycling led to greater degradation of the local shaft capacity of the cranially pulled piles, resulting in a greater proportion of the head load being carried by the pile base in compression. The evolution of global pile stiffness was not influenced by the surface texture; it was found to depend on the ratio of the mean to cyclic load, with larger ratios leading to increases in stiffness. Analysis using stability diagrams shows that in terms of absolute loads, the cranially pulled piles are stable over a larger range of mean and cyclic loads. However, the caudally pulled piles have larger regions of stability in terms of the mean and cyclic loads normalized by the corresponding pile capacity. The post-cyclic tensile capacity decreased as the cyclic load magnitude was increased for all piles, and the cranially pulled piles mobilized greater post-cyclic tensile capacities. The results provide evidence of the effect that bioinspired surface textures can have on the stability of piles and show the tradeoffs that emerge due to the direction-dependent shaft resistance mobilization.
Cyclic axial response and stability of snakeskin-inspired piles in sand
https://orcid.org/http://orcid.org/0000-0003-4649-925X
Piles subjected to cyclic axial loading can experience loss of serviceability due to accumulation of excessive deformations, which is a common failure mode for offshore foundations. This investigation examines the cyclic behavior of piles with snakeskin-inspired textures that exhibit a direction-dependent shearing and volume change response. Centrifuge pile load tests were performed on three piles with snakeskin-inspired surfaces, one which was cranially installed and caudally pulled and two with asperities of varying height which were caudally installed and cranially pulled. Tests were also performed on a reference rough pile and a reference smooth pile. The experiments performed at an acceleration equivalent to 30 g investigated the effect of the surface texture on the capacity, load transfer, and cyclic behavior of the piles. Following in-flight installation of the piles, the load-controlled cyclic load tests performed with various combinations of mean and cyclic loads show that the cranially pulled piles failed in a smaller number of cycles due to the accumulation of deformations in the compressive, caudal stage of the cycles. However, failure of the caudally pulled pile was more brittle, with fewer cycles between yielding and failure in comparison to the cranially pulled piles. Cycling led to greater degradation of the local shaft capacity of the cranially pulled piles, resulting in a greater proportion of the head load being carried by the pile base in compression. The evolution of global pile stiffness was not influenced by the surface texture; it was found to depend on the ratio of the mean to cyclic load, with larger ratios leading to increases in stiffness. Analysis using stability diagrams shows that in terms of absolute loads, the cranially pulled piles are stable over a larger range of mean and cyclic loads. However, the caudally pulled piles have larger regions of stability in terms of the mean and cyclic loads normalized by the corresponding pile capacity. The post-cyclic tensile capacity decreased as the cyclic load magnitude was increased for all piles, and the cranially pulled piles mobilized greater post-cyclic tensile capacities. The results provide evidence of the effect that bioinspired surface textures can have on the stability of piles and show the tradeoffs that emerge due to the direction-dependent shaft resistance mobilization.
Cyclic axial response and stability of snakeskin-inspired piles in sand
Acta Geotech.
O’Hara, Kyle B. (author) / Martinez, Alejandro (author)
Acta Geotechnica ; 19 ; 1139-1158
2024-03-01
20 pages
Article (Journal)
Electronic Resource
English
Bioinspiration , Centrifuge testing , Cyclic loading , Piles , Sand , Snakeskin-inspired surfaces , Frictional anisotropy , Frictional directionality Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
Cyclic axial response and stability of snakeskin-inspired piles in sand
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