What is cantilever 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 do you calculate a cantilever slab?
- 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.
- 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 thick should a cantilever slab be?
The structural design of cantilevered slabs should satisfy the following requirements:- ( 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.
Where are cantilever slabs used?
In bridges, towers, and buildings Cantilevers are widely found in construction, notably in cantilever bridges and balconies (see corbel). In cantilever bridges, the cantilevers are usually built as pairs, with each cantilever used to support one end of a central section.
What is the principle of cantilever?
cantilever, beam supported at one end and carrying a load at the other end or distributed along the unsupported portion. The upper half of the thickness of such a beam is subjected to tensile stress, tending to elongate the fibres, the lower half to compressive stress, tending to crush them.
What is the maximum length of cantilever slab?
The maximum span depends on the deflection at the extreme end that can be tolerated. The deflection limit for cantilever beams set by most design codes is L/180 for live load and L/90 for combined dead & live load. The maximum span depends on the material of the beam (wood, steel or concrete).
How much cantilever is possible?
The cantilever beam can be made of either concrete or steel whose one end is cast or anchored to a vertical support. It is a horizontal beam structure whose free end is exposed to vertical loads. What is the maximum span of cantilever beams? Usually, for small cantilever beams, the span is restricted to 2 m to 3 m.
Does cantilever slab have beam?
It is a horizontal beam structure whose free end is exposed to vertical loads. In a building, a cantilever is constructed as an extension of a continuous beam, and in bridges, it is a segment of a cantilever girder.
What is the maximum length of cantilever?
What is the maximum span of cantilever beams? Usually, for small cantilever beams, the span is restricted to 2 m to 3 m. But the span can be increased either by increasing the depth or using a steel or pre-stressed structural unit.
What is the purpose of cantilever?
Cantilevers provide a clear space underneath the beam without any supporting columns or bracing. Cantilevers became a popular structural form with the introduction of steel and reinforced concrete. They are used extensively in building construction, notably in: Cantilever bridges.
What is cantilever structure?
A cantilever is a rigid structural element that extends horizontally and is supported at only one end. Typically it extends from a flat vertical surface such as a wall, to which it must be firmly attached. Like other structural elements, a cantilever can be formed as a beam, plate, truss, or slab.