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General Design Requirements for Slabs as Per IS 456-2000
1.Effective Span : the effective span of a simply supported slab shall be taken as clear span plus effective depth of the slab or center to center distance between the supports which ever is less
the effective span of a cantilever slab shall be taken as its lenght ot he face of the support plus half the effective depth except where it forms the end of a continous slab where the lenght to the centre of support shall be taken.
2.Limiting Stiffiness : the stiffness of slabs is governed by the span to depth ratio. As per Clause 23.2 of IS 456 for spans not exceeding 10 m, the span to depth ratio should not exceed the limits given below
Cantilevers - 7
Simply supported -20
contiuous -26
Depending upon the type of steel and percentage of steel, the above values have be modified
for two ways slabs,the shorter span should be used for calculating the span to effective depth ratio.
3 Minimum Reinforcement : the reinforcement in either direction of span shall not be less than 0.15% if gross cross sectional area if mild steel is used. how ever this value is reduced to 0.12% where high strenght deformed bars or welded wire fabrics are used.
contact : Rao(09966871942)
General Design Requirements for Slabs as Per IS 456-2000
1.Effective Span : the effective span of a simply supported slab shall be taken as clear span plus effective depth of the slab or center to center distance between the supports which ever is less
the effective span of a cantilever slab shall be taken as its lenght ot he face of the support plus half the effective depth except where it forms the end of a continous slab where the lenght to the centre of support shall be taken.
2.Limiting Stiffiness : the stiffness of slabs is governed by the span to depth ratio. As per Clause 23.2 of IS 456 for spans not exceeding 10 m, the span to depth ratio should not exceed the limits given below
Cantilevers - 7
Simply supported -20
contiuous -26
Depending upon the type of steel and percentage of steel, the above values have be modified
for two ways slabs,the shorter span should be used for calculating the span to effective depth ratio.
3 Minimum Reinforcement : the reinforcement in either direction of span shall not be less than 0.15% if gross cross sectional area if mild steel is used. how ever this value is reduced to 0.12% where high strenght deformed bars or welded wire fabrics are used.
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