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Learning / bridge engineering

pile

Shaft resistance component

Lesson review: expert verification remains open

This lesson has received a full-context editorial review and a check of its technical explanations. Selected arithmetic has been checked separately. This is not independent engineering sign-off.

Checks needed for project use

  • Bridge component studies and adjustable examples still need an independent bridge-engineering review, including applicability, load models and detailing guidance.
  • Specialist review remains for: Compare axial load-transfer curves, lateral p–y springs and continuum soil models. Establish stratigraphy and groundwater first; a fixed support is a hypothesis, not site evidence. The pile calculation is a local idealisation; it does not verify the displayed bridge or applicable design requirements.

These are educational models and exercises. Check their assumptions before using the results. The full technical content and every diagram have not yet been independently verified.

Concrete and steel calculations retain their stated first-generation Eurocode teaching basis. Use the standards and amendments specified for your project; do not mix generations without an appropriate design basis.

Read the lesson register and outstanding review notes

Loads and actions

Piles transfer axial force by shaft and base resistance, and horizontal force by soil reaction and bending. Group effects and downdrag can change individual demands.

Choose a model

Compare axial load-transfer curves, lateral p–y springs and continuum soil models. Establish stratigraphy and groundwater first; a fixed support is a hypothesis, not site evidence.

Design considerations

Choose driven or bored piles, diameter and toe level from resistance, settlement, installation effects and access. Verify structural bending/axial demand, group behaviour and testing strategy.

Durability and maintenance

Consider aggressive ground, corrosion, concrete quality and inaccessible defects. Construction logs, integrity tests and load tests provide evidence that cannot be recovered from the finished surface alone.

Shaft resistance component

Illustrative unfactored shaft component. No base resistance, group reduction, negative skin friction, partial factors or settlement verification.

Assume D = 0.8 m and uniform unit shaft resistance 50 kPa: Rs = πDLfs.

Rs = 1885.0 kN