Learning / bridge engineering
abutment
Dry retained soil resultant
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 wall/frame with foundation and soil assumptions consistent with permitted movement. Active pressure requires sufficient displacement; integral cyclic soil response cannot be represented by an unqualified active-pressure triangle. The earth 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
An abutment receives deck reactions, earth pressure, surcharge, water pressure and restraint forces. Integral abutments additionally cycle against backfill and transfer deck-end moment.
Choose a model
Use a wall/frame with foundation and soil assumptions consistent with permitted movement. Active pressure requires sufficient displacement; integral cyclic soil response cannot be represented by an unqualified active-pressure triangle.
Design considerations
Compare full-height walls, bank seats, spill-through supports and integral end frames. Check sliding, overturning, bearing, settlements, structural reinforcement, approach movement and access.
Durability and maintenance
Drainage behind the wall, joint leakage and transition settlement affect both structure and route. Track changes at the backwall, wing walls and bearing shelf.
Dry retained soil resultant
No water, surcharge or seismic effects. Do not use this active coefficient for restrained or integral walls without justification.
Illustrative active soil only: γ = 18 kN/m³, K = 1/3. H = Kγh²/2 per metre wall; base moment = Hh/3.
H = 75.0 kN/m; M = 125.0 kN·m/m