A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Retrofitting Uplift Capacity of Telecommunication Tower Foundation with Helical Piles in Dense Granular Soils
These days, it is typical for the height of existing telecommunication towers to be increased to accommodate for the ever-increasing cellular and data demands. This results in considerable increases in uplift force of the tower foundation. To resist the uplift force, in dense granular soils, concrete cast-in-place (CIP) tension piles are typically used adjacent to the tower foundation with a galvanized steel frame to connect the piles to the foundation. However, CIP piles are not only expensive but also require access to larger equipment such as drilling rigs and concrete trucks. These factors can cause additional costs and operational issues during the construction process. Therefore, in this study, as an alternative method to resistance of uplift force, the applicability of helical piles were investigated experimentally and numerically. Six helical piles were installed using a modified installation technique with high torque. The pullout force was measured as the uplift resistance. Furthermore, the total increased uplift capacity of the foundation was analyzed based on 2-dimensional axisymmetric numerical modeling parametrized with soil properties of the site, and a parametric study was performed. These findings suggest that helical piles can be an effective method of resisting the uplift force in dense granular soils created by an extension of a telecommunication tower section compared to CIP piles.
Retrofitting Uplift Capacity of Telecommunication Tower Foundation with Helical Piles in Dense Granular Soils
These days, it is typical for the height of existing telecommunication towers to be increased to accommodate for the ever-increasing cellular and data demands. This results in considerable increases in uplift force of the tower foundation. To resist the uplift force, in dense granular soils, concrete cast-in-place (CIP) tension piles are typically used adjacent to the tower foundation with a galvanized steel frame to connect the piles to the foundation. However, CIP piles are not only expensive but also require access to larger equipment such as drilling rigs and concrete trucks. These factors can cause additional costs and operational issues during the construction process. Therefore, in this study, as an alternative method to resistance of uplift force, the applicability of helical piles were investigated experimentally and numerically. Six helical piles were installed using a modified installation technique with high torque. The pullout force was measured as the uplift resistance. Furthermore, the total increased uplift capacity of the foundation was analyzed based on 2-dimensional axisymmetric numerical modeling parametrized with soil properties of the site, and a parametric study was performed. These findings suggest that helical piles can be an effective method of resisting the uplift force in dense granular soils created by an extension of a telecommunication tower section compared to CIP piles.
Retrofitting Uplift Capacity of Telecommunication Tower Foundation with Helical Piles in Dense Granular Soils
Afzalian, Mostafa (author) / Medhi, Bryce (author) / Eun, Jongwan (author) / Medhi, Tom (author)
Geo-Congress 2020 ; 2020 ; Minneapolis, Minnesota
Geo-Congress 2020 ; 239-245
2020-02-21
Conference paper
Electronic Resource
English
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