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Helical screw piles (HSP) have been used extensively in North America and other countries to support superstructures, particularly with applications in power transmission towers, residential and commercial buildings, and pedestrian bridges. The main benefits of HSPs over standard foundation systems are quick installation, cost-effectiveness, low vibration, noise during installation, improved performance, and environmental sustainability. A few design codes are available for predicting the axial capacity of HSP such as CFEM (Canada), AC 358 (USA), AS 2159 (Australia), and Practice note 28 (New Zealand). However, the prevalent benefit of HSP is the ability to estimate axial capacity from field-installed torque, which is widely utilized in the industry for quality assurance to meet design load requirements. Extensive research through field tests and numerical analyses has been performed on HSP in the past few decades. However, there are still uncertainties in accurately estimating the axial capacity of HSP, and therefore, additional research is required to advance the design and understanding of HSPs. This study aims to summarize current literature and international codes on the axial capacity estimation of HSP. The paper also encompasses the correlation between ultimate load and installed torque. It is expected that the HSP design guidelines and torque correlations discussed in this paper will provide a quick reference design aid for practising engineers to design sustainable foundations using HSP as an alternative to other conventional foundation systems.

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Axial Capacity Prediction of Helical Screw Piles—A State-of-The-Art Review

  • 会议论文

  • 发表日期：

    2025年

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  • Debarshi Das,
  • A. H. M. Muntasir Billah

摘要

Helical screw piles (HSP) have been used extensively in North America and other countries to support superstructures, particularly with applications in power transmission towers, residential and commercial buildings, and pedestrian bridges. The main benefits of HSPs over standard foundation systems are quick installation, cost-effectiveness, low vibration, noise during installation, improved performance, and environmental sustainability. A few design codes are available for predicting the axial capacity of HSP such as CFEM (Canada), AC 358 (USA), AS 2159 (Australia), and Practice note 28 (New Zealand). However, the prevalent benefit of HSP is the ability to estimate axial capacity from field-installed torque, which is widely utilized in the industry for quality assurance to meet design load requirements. Extensive research through field tests and numerical analyses has been performed on HSP in the past few decades. However, there are still uncertainties in accurately estimating the axial capacity of HSP, and therefore, additional research is required to advance the design and understanding of HSPs. This study aims to summarize current literature and international codes on the axial capacity estimation of HSP. The paper also encompasses the correlation between ultimate load and installed torque. It is expected that the HSP design guidelines and torque correlations discussed in this paper will provide a quick reference design aid for practising engineers to design sustainable foundations using HSP as an alternative to other conventional foundation systems.