What are the typical reinforcement details of a cantilever slab?

 

Cantilever slabs are a type of concrete slab that projects beyond the supporting beam. They are typically used in balconies, overhangs, and other structures where a cantilevered beam is required.

The reinforcement for a cantilever slab is designed to resist the tensile forces that are generated when the slab is loaded. The main reinforcement is provided on the top of the slab, along the span direction. It is typically made of mild steel bars with a diameter of 12mm or 16mm. The main reinforcement is bent back at the support end to form a hairpin shape. This helps to anchor the reinforcement and prevent it from pulling out of the concrete.

Distribution reinforcement is also provided on both the top and bottom of the slab. It is typically made of mild steel bars with a diameter of 8mm or 10mm. The distribution reinforcement helps to distribute the load evenly across the slab and prevent cracking.

Stirrups are also provided at regular intervals along the length of the slab. They help to prevent the slab from buckling under load. Stirrups are typically made of mild steel bars with a diameter of 6mm or 8mm.

The specific reinforcement details will vary depending on the size and loading of the cantilever slab. However, the general principles outlined above will apply to most cantilever slabs.

Here are some additional points to keep in mind when designing the reinforcement for a cantilever slab:

• The minimum percentage of reinforcement is 0.15% of the gross cross-sectional area if mild steel bars are used.
• The main reinforcement should be spaced at a maximum of 300mm on center.
• The distribution reinforcement should be spaced at a maximum of 450mm on center.
• The stirrups should be spaced at a maximum of 600mm on center.

It is important to consult with a structural engineer to ensure that the reinforcement for a cantilever slab is designed correctly.

Here are some key takeaways from the article:

• The main reinforcement for a cantilever slab is provided on the top of the slab, along the span direction.
• Distribution reinforcement is also provided on both the top and bottom of the slab.
• Stirrups are provided at regular intervals along the length of the slab to prevent buckling.
• The specific reinforcement details will vary depending on the size and loading of the cantilever slab.
• It is important to consult with a structural engineer to ensure that the reinforcement for a cantilever slab is designed correctly.