How do you determine the thickness of a cantilever slab?
How do you determine the thickness of a cantilever slab?
Standards like ACI 318 have specified the minimum thickness of the slab based on the span of the slab.
- Simply Supported Slab = Span / 20.
- One End Continuous Slab = Span / 24.
- Both End Continuous Slab = Span / 28.
- Cantiliver = Span / 10.
How much cantilever slab is possible?
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 many feet can you cantilever?
The American Wood Council states that cantilevers are limited to 1/4 the span of the joists. Joist Spacing (o.c.) Maximum allowable overhang cannot exceed 1/4 of the actual main span.
What is the maximum length of cantilever beam?
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 maximum cantilever length?
How will you design a cantilever slab?
Perform static analysis considering global loading in ultimate limit state.
- Design load in each slab is equal to pi=γg×gi+γq×qi=1.35×gi+1.50×qi, thus on 1.00 m wide strip, it is:
- M10=-p1×L12/8=-16.5×4.502/8=-41.8 kNm.
- M12=M21=-p2×L22/12=-9.75×4.002/12=-13.0 kNm.
- M23=-p3×L32/8=-9.75×4.002/8=-19.5 kNm.
What is the minimum thickness of a cantilever slab?
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.
How wide can a cantilever be?
According to the new span tables and IRC provisions, cantilevers can extend up to one-fourth the backspan of the joist. This means that joists, such as southern pine 2x10s at 16 inches on-center, spanning 12 feet are allowed to cantilever up to an additional 3 feet (see illustration, below).