Learning / bridge engineering
bearing anchor
Anchor group shear
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: Start with plate equilibrium and a bolt-group model. Use local concrete strut-and-tie or anchorage checks for splitting, breakout and edge effects; a rigid equal-share bolt model is only a first estimate. The anchor 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
Anchors and plates transfer horizontal loads, local compression and any designed uplift into the seat. Eccentric force paths add moments and prying.
Choose a model
Start with plate equilibrium and a bolt-group model. Use local concrete strut-and-tie or anchorage checks for splitting, breakout and edge effects; a rigid equal-share bolt model is only a first estimate.
Design considerations
Compare cast-in anchors, sockets and approved post-installed systems where applicable. Coordinate edge distance, reinforcement, grout thickness, tightening and replaceability.
Durability and maintenance
Check missing nuts, grout cracking, corrosion and water accumulation. An inaccessible anchor can prevent otherwise straightforward bearing replacement.
Anchor group shear
Ignores prying, eccentricity, unequal stiffness, concrete failure modes and interaction with tension.
Four identical anchors, concentric rigid plate: average shear per anchor = H/4.
Average V = 30.0 kN per anchor