👉What Is a Cantilever Slab?

💫A cantilever slab is a reinforced concrete slab that is fixed (supported) at one end and extends freely at the other end without any support below.

📜In simple words:

⏺One side is held firmly by a beam, wall, or column, and the other side hangs out in the air.

🚧Key Characteristics

⏺Fixed support at one end only
⏺No column or wall support at the free end
⏺Carries load by bending action
⏺Top reinforcement is critical (tension occurs at the top)

🏷Where Cantilever Slabs Are Used

⏺Balconies
⏺Canopies and sunshades
Chajjas
⏺Projections in buildings
Stair landings

🔰Structural Behavior (Very Important)

⏺Top fibers:-Tension zone
⏺Bottom fibers:-Compression zone
❇️Steel bars are placed near the top surface
⏺Load is transferred back to the fixed support

🎲Advantages

⏺Provides architectural projection
⏺No need for columns below
Saves space
⏺Aesthetic appearance

📍Disadvantages

⏺Higher bending moment at support
⏺Requires careful design and detailing
⏺Deflection and cracking risk if poorly designed

⚡️Simple Example

⏺A balcony slab extending out from a building wall without any column beneath it is a cantilever slab.

@etconp