Probabilistic vs Deterministic Foundation Design: Impact of PDA and SLT Data on Required Safety Factor in an Indonesian Project Case Study

Authors

  • Andreas Setiawan Faculty of Civil and Enviromental Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia https://orcid.org/0009-0004-8058-1032
  • Endra Susila Faculty of Civil and Enviromental Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia
  • Indra Djati Sidi Faculty of Civil and Enviromental Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia https://orcid.org/0009-0001-7241-4013
  • Rio Leandro Faculty of Civil and Enviromental Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia https://orcid.org/0009-0009-7640-2245

Abstract

Foundation design using the Allowable Stress Design (ASD) method is characterized by less consistent reliability that is difficult to quantify, leading to overly conservative or optimistic design. Therefore, this study aimed to implement the Reliability-Based Design (RBD) method in foundation design to achieve consistent reliability levels and evaluate the equivalent safety factor generated. The design process was initially conducted based on API method and updated using field test data, namely the Pile Driving Analyzer (PDA) and Static Load Test (SLT). Statistical parameter updating was performed using a statistical analysis through the Bayesian updating method. The results showed that RBD method was capable of explicitly quantifying uncertainties. Furthermore, the availability of more and higher-quality data contributed to a more accurate representation of uncertainty, causing a greater reduction in the required equivalent factor of safety. This showed that the probabilistic method enabled the application of a lower safety factor compared to the conservative value of approximately 2.5 commonly adopted in ASD, without compromising the target reliability. Through the addition of data from PDA and SLT testing, this study showed that the RBD method could significantly reduce the required safety factor to a value of 1.68.

How to Cite

Andreas Setiawan, Endra Susila, Indra Djati Sidi, Rio Leandro (2026). Probabilistic vs Deterministic Foundation Design: Impact of PDA and SLT Data on Required Safety Factor in an Indonesian Project Case Study. Journal of Engineering and Technological Sciences, Vol. 58 No. 5 (2026): Vol. 58 No. 5(2026): October (In Progress), 685-696. https://doi.org/10.5614/j.eng.technol.sci.2026.58.5.7

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Date Log

Submitted
November 24, 2025
Accepted
July 22, 2026
Published
August 15, 2026

Keywords

  • bayesian updating
  • equivalent factor of safety
  • PDA
  • reliability-based design
  • SLT

How to Cite

Probabilistic vs Deterministic Foundation Design: Impact of PDA and SLT Data on Required Safety Factor in an Indonesian Project Case Study. (2026). Journal of Engineering and Technological Sciences, 58(5), 685-696. https://doi.org/10.5614/j.eng.technol.sci.2026.58.5.7