Answer / sandeep thakur

01 chair per sq.m

Answer / er.prabhakara.b

As per IS:2502-1963 Clause 7.4.2
SL&s - In slabs, whether double or multiple, layers of
reinforcement are provided, the distances between the
layers may be maintained by the method illustrated in Fig.9
The Code does not Specify the Exact Spacing of the Chairs
but in Practal the Spacers are provided based on the
Spacing and Dia of Main Reinforcement it is 1 Chair per Sqm

Answer / 9040471784

1. Chairs are provided for maintain the proper gap between the 1st layer & 2nd layer.
2. In IS Code it is not mentioned the chair spacing.
3. As per my experience it should be provided 1 chair in 1 sqm.
4. If the slab is 6 sqm then there will we use 6 nos of chairs

Answer / moamen saad

calculate the buckling affecting the chair branches due to dead and live loads comes from top mesh load and wight of labors, check it with allowable buckling.
i did an excel sheet according to ACI-318

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