A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Evaluating scale effects and bearing portions in centrifuge modeling of helical anchors: sand
https://orcid.org/http://orcid.org/0000-0002-2681-2280
https://orcid.org/http://orcid.org/0000-0003-0289-6640
https://orcid.org/http://orcid.org/0000-0003-4332-7575
Helical anchors are bearing elements that can resist uplift loads by a combination of shaft and helical plate bearing. The application of helical piles as offshore wind turbine foundations has recently become interesting. However, large size of such structures limits the possible physical modeling in a geotechnical centrifuge. In the current study, the limits of physical modeling concerning particle size effect on the uplift capacity of helical piles were evaluated. The modeling of models technique was employed. The contribution of the shaft and helical plate to the anchor uplift capacity was also studied. The results indicate that small ratios of helical plate diameter to shaft diameter lead to higher contribution of the shaft to the total anchor capacity. It was also found that scale effects could be safely ignored if effective helical radius to the mean grain size of the sand is greater than 16. The normalized mobilization distance and dimensionless breakout factor were in good agreement with the previous researches. The limits reported here could contribute to a more reliable physical modeling of helical piles and anchors in the future researches.
Evaluating scale effects and bearing portions in centrifuge modeling of helical anchors: sand
https://orcid.org/http://orcid.org/0000-0002-2681-2280
https://orcid.org/http://orcid.org/0000-0003-0289-6640
https://orcid.org/http://orcid.org/0000-0003-4332-7575
Helical anchors are bearing elements that can resist uplift loads by a combination of shaft and helical plate bearing. The application of helical piles as offshore wind turbine foundations has recently become interesting. However, large size of such structures limits the possible physical modeling in a geotechnical centrifuge. In the current study, the limits of physical modeling concerning particle size effect on the uplift capacity of helical piles were evaluated. The modeling of models technique was employed. The contribution of the shaft and helical plate to the anchor uplift capacity was also studied. The results indicate that small ratios of helical plate diameter to shaft diameter lead to higher contribution of the shaft to the total anchor capacity. It was also found that scale effects could be safely ignored if effective helical radius to the mean grain size of the sand is greater than 16. The normalized mobilization distance and dimensionless breakout factor were in good agreement with the previous researches. The limits reported here could contribute to a more reliable physical modeling of helical piles and anchors in the future researches.
Evaluating scale effects and bearing portions in centrifuge modeling of helical anchors: sand
https://orcid.org/http://orcid.org/0000-0002-2681-2280
https://orcid.org/http://orcid.org/0000-0003-0289-6640
https://orcid.org/http://orcid.org/0000-0003-4332-7575
Helical anchors are bearing elements that can resist uplift loads by a combination of shaft and helical plate bearing. The application of helical piles as offshore wind turbine foundations has recently become interesting. However, large size of such structures limits the possible physical modeling in a geotechnical centrifuge. In the current study, the limits of physical modeling concerning particle size effect on the uplift capacity of helical piles were evaluated. The modeling of models technique was employed. The contribution of the shaft and helical plate to the anchor uplift capacity was also studied. The results indicate that small ratios of helical plate diameter to shaft diameter lead to higher contribution of the shaft to the total anchor capacity. It was also found that scale effects could be safely ignored if effective helical radius to the mean grain size of the sand is greater than 16. The normalized mobilization distance and dimensionless breakout factor were in good agreement with the previous researches. The limits reported here could contribute to a more reliable physical modeling of helical piles and anchors in the future researches.
Evaluating scale effects and bearing portions in centrifuge modeling of helical anchors: sand
Acta Geotech.
Heshmati Rafsanjani, Ali Akbar (author) / Salehzadeh, Hossein (author) / Nuri, Hamed (author)
Acta Geotechnica ; 16 ; 2917-2932
2021-09-01
16 pages
Article (Journal)
Electronic Resource
English
Breakout factor , Centrifuge modeling , Helical anchor , Mobilization distance , Particle size effect , Scale effects Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
Centrifuge Modeling of Helical Anchors in Sand
| British Library Conference Proceedings | 2003
Pullout Performance of Helical Screw Anchors in Sand
| British Library Conference Proceedings | 2001
Pullout Performance of Inclined Helical Screw Anchors in Sand
| Online Contents | 1998