- 2080 Baisakh · 3 marks
Laterally loaded piles with examples
Short answer
Laterally loaded piles resist horizontal forces (e.g., retaining walls, jetties, towers). They transfer load by soil reaction, bending like a beam on elastic foundation. Analysis uses Broms' method, subgrade reaction or p–y curves; capacity increases with larger diameter or batter piles.
Describe briefly the laterally loaded piles with suitable examples.
A laterally loaded pile is a pile that has to resist horizontal forces or moments in addition to (or instead of) vertical load. The load is transferred to the soil by lateral soil reaction along the shaft, and the pile bends like a beam on an elastic foundation.
Examples
- Piles under retaining walls, bridge abutments and quay walls (earth and water pressure).
- Jetties, wharves and offshore platforms subject to waves, berthing and mooring forces.
- Transmission towers, tall chimneys and high-rise buildings due to wind and earthquake.
- Bridge piers subject to braking forces and flowing water.
Behaviour and analysis
- Short (rigid) piles fail by rotation of the pile or by failure of the soil. Long (flexible) piles fail by yielding of the pile material, with a plastic hinge.
- Analysis: Broms' method (ultimate lateral load for short and long piles in cohesive and cohesionless soil), subgrade reaction method (Winkler spring model with ), and p–y curves for non-linear soil.
- The lateral capacity is increased by larger diameter, by fixity to the cap, or by using batter (inclined) piles to carry the horizontal component.
✓ Answer checked by Claude Sonnet 5.5