Improved design method for bent pile structures (cast-in-drilled-hole shafts) based on nonlinear characteristics

Jaeyoung Kim, Sangseom Jeong, Youngho Kim

Research output: Contribution to journalArticle


A fundamental study of bent pile structures subjected to combined loads in multi-layered soil is conducted using in situ load tests and a load transfer approach. The emphasis is on quantifying an improved design method developed by considering the pile's plastic hinge and the column-pile interaction. An analytical model is developed that takes into account the nonlinear behaviour of materials for different soil-pile conditions. A framework for determining an optimized column-pile diameter ratio on basis of theoretical analysis is proposed through the relation between the column-pile diameter ratio and lateral crack load ratio. Based on the measured results, an optimized limit depth for a minimum steel reinforcement ratio is defined as the relationship between the bending moments and the crack moments of the concrete pile. An optimized limit depth for a minimum steel reinforcement ratio proportionally decreases as pile length increases, and beyond that the limit depth converges at a constant value (≃0.3).

Original languageEnglish
Pages (from-to)1239-1258
Number of pages20
JournalMaterials and Structures/Materiaux et Constructions
Issue number7
Publication statusPublished - 2014 Jul


All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials

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