Learning / bridge engineering
kerb rebar
Anchorage tension couple
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: Use a strut-and-tie or sectional model with realistic lever arm and development length. Bars drawn in the scene show connectivity only. The tie-force 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 notesLoads and actions
Anchorage steel transfers the tension side of a local bending couple into the slab. Concrete compression completes equilibrium; shear and splitting act at the same interface.
Choose a model
Use a strut-and-tie or sectional model with realistic lever arm and development length. Bars drawn in the scene show connectivity only.
Design considerations
Develop reinforcement beyond the critical section, manage bends, cover and congestion, and verify the slab can receive the force. A thicker kerb without anchorage may not improve the complete path.
Durability and maintenance
Cracking and corrosion at the root can degrade bond and reinforcement. Verify the remaining section and load path before specifying local patch repairs.
Anchorage tension couple
Equilibrium force only. Bar area, bond, development length and concrete nodal resistance require separate checks.
For a 0.4 m lever arm: tie force T = M/z.
T = 150.0 kN