A flat slab is a reinforced concrete slab directly supported by columns without the use of beams. The load transfer is from slab → column → foundation.
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Load Distribution (Direct Design Method – IS 456 Cl. 31.4.3)
Conditions for Direct Design Method (DDM):
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At least 3 spans in each direction.
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Panels nearly square (long span / short span ≤ 2).
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Successive spans do not differ by > 1/3rd.
Load Calculation
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Dead load (self-weight of slab + finishes).
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Live load (as per IS 875 Part 2).
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Additional loads (partitions, services, etc.).
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Below files are available for download
- DESIGN OF FLAT SLAB.xls – Excel spread sheet
- DESIGN OF FLAT SLAB .pdf
Product images are the reference to Excel sheet for DESIGN OF FLAT SLAB “Do write the details in the Yellow cells only and do not make edit in other cell as the excel sheet is not protected with password and you can edit anywhere in the sheet, accidental edits in the cells may lead to errors in the design sheet due to overriding of formula by values edited by you”
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