Learning / bridge engineering
deck
Transverse slab strip
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: A 1 m strip illustrates transverse flexure. A plate or shell model captures two-way load spreading and support-line effects. A composite longitudinal model must include appropriate slab effective width, cracking and interface shear transfer. The slab 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
Wheel or sleeper contact spreads through surfacing or ballast into the slab. Consider transverse bending, cantilever edge loads, longitudinal chord stress, temperature gradients and shrinkage restraint together.
Choose a model
A 1 m strip illustrates transverse flexure. A plate or shell model captures two-way load spreading and support-line effects. A composite longitudinal model must include appropriate slab effective width, cracking and interface shear transfer.
Design considerations
Options include reinforced concrete, prestressed concrete, orthotropic steel and precast panels. Set depth from strength and serviceability, then arrange reinforcement or ribs for bending, shear, crack control, anchorage and practical casting.
Durability and maintenance
Waterproofing failure can wet cracks and reinforcement. Record crack orientation and wetting; investigate cover, chloride exposure and drainage before specifying repairs.
Transverse slab strip
Flexural demand estimate only; not a completed reinforcement design. No load factors, crack, shear, anchorage or minimum-steel checks.
A 3 m simply supported strip: M = wL²/8. With z = 250 mm and assumed steel design stress 435 MPa, As ≈ M/(fz).
M = 33.8 kN·m/m; As ≈ 310 mm²/m