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Learning / bridge engineering

kerb

Edge overturning action

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: Trace horizontal load through kerb flexure, reinforcement anchorage, deck cantilever and the global system. Local resistance cannot be inferred from the visual size of the kerb. The kerb 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

An edge may retain ballast and carry local accidental actions under the applicable railway requirements. Vehicle interaction, load height and distribution must be established for the project.

Choose a model

Trace horizontal load through kerb flexure, reinforcement anchorage, deck cantilever and the global system. Local resistance cannot be inferred from the visual size of the kerb.

Design considerations

Compare monolithic and connected edge details with an explicit force path. Check flexure, shear, anchorage, crack control and the consequences of local damage.

Durability and maintenance

Inspect impact damage, cracks at the root and water entering the edge detail. Repairs need restored anchorage and waterproofing continuity.

Edge overturning action

Chosen teaching force, not a derailment requirement, containment assessment or design capacity.

At 0.6 m above the slab: root moment M = Hh.

M = 60.0 kN·m