How thick should a cantilever slab be?
How thick should a cantilever slab be?
Cantilevered Slabs a) The minimum overall thickness should be– (i) 110 mm for span not greater than 500 mm; (ii) 125 mm for span greater than 500 mm but not greater than 750 mm; (iii) 150 mm for span greater than 750 mm.
What is cantilevered slab?
Cantilever slabs are common features in buildings due to the need to have bigger spaces at upper floors. To achieve this, architects normally extend the slab beyond the ground floor building line, thereby forming a cantilever.
How far can concrete span unsupported?
Reinforced concrete allows a wide range of structural options and provides cost-effective solutions for a multitude of situations—from residential buildings with moderate live loads and spans of about 25 ft, to commercial buildings with heavier live loads and spans ranging from 40 ft to 50 ft and beyond.
What should be the maximum length of cantilever slab?
The maximum length of cantilever slab shouldn’t be more than 2m or 6–6.5 ft. The thickness of slab should also satisfy span/ effective depth ratio of 7 required for cantilever slab.
How do you make a cantilever slab manually?
Slab loading
- Slab loading.
- Ultimate load = 1.35gk+1.5qk = 1.35×4.375+1.5×4 = 11.91 kN/mm2. Bending moment.
- n = 11.91 kN/mm2. Bending moment.
- Reinforcement.
- k’>kCompression reinforcement is not required.
- Provide T10 @ 200mm C/C (As pro. = 393mm2/m.
- Check for deflection (same method as two way slab)
- Deflection check is ok.
How do you cantilever a slab how long can it be cantilevered?
Cantilever- (L/d) ratio should be less than 7. The maximum length of cantilever slab shouldn’t be more than 2m or 6–6.5 ft. The thickness of slab should also satisfy span/ effective depth ratio of 7 required for cantilever slab.
How do you make a cantilever slab?
How much can concrete bend before it breaks?
Everyday concrete can handle at least 3,000 pounds per square inch (psi) of pressure before breaking.
What is the maximum span of a slab?
The answer to question is simple, the limit to span is about 6–15m depending upon how much you spend because as the length increases depth of slab increases since bending moment is increasing and the structure will become more and more uneconomical. Also drop panel size increases for gradual transfer of load.
How do you give Reinforcement in a cantilever slab?
Cantilever Slab Reinforcement Details
- Beam with bent up bars.
- Stirrups should be raised adjacent to the supports.
- Column stirrups should continues inside the beams.
- Positive reinforcement bars.
- Bent up bars should extend along the cantilever and then bend down and go back to support.
Can a concrete slab bend?
Concrete is not known for its ability to bend, but as this experimental example shows, special formulations of the material can be both flexible and strong. The key is not to prevent cracks completely, but to allow the formation of distributed microcracks that can continue to bear an increasing load.
How can we design a cantilever slab?
Structural Design of Cantilever Slabs – Solved Example (1) Provide distribution bars (2) Verify the section for shear (3) Check for cracking (4) Do the detailing sketches
What are the uses of cantilever beam?
In building constructions, there are various applications of the cantilevered beam such as cantilevers carrying a gallery, roof, runway for an overhead traveling crane, or part of a building above and also used in various structures such as sun shed, shelves, large halls, exhibition buildings, and armories.
What is the maximum span for a cantilever beam?
There is no definite maximum span for cantilever beams. However, it is usually limited between 2m and 2.5m which can vary depending on the variables.
What does cantilever mean in building design?
A cantilever is an important structural element that provide less support and efficient use of space in building design. The cantiever is rigidly fixed in one end and the other end is hanged in the air. It does not need a column or wall to support this end. So, the space below the cantilever can be used efficiently.
