The 'equivalent frame method' for flat slab design divides the structure into:
Choose the correct answer
Only individual column footings
2D frames (each full floor width strip + columns) in each direction — moments distributed to column and middle strips
1D simply supported slabs
Isolated columns only
Correct Answer
B. 2D frames (each full floor width strip + columns) in each direction — moments distributed to column and middle strips
Why is this the answer?
IS 456 Annex D / ACI 318 Equivalent Frame Method: flat slab analysed as a series of 2D frames in each direction. Each frame consists of: (1) Equivalent beam (whole floor slab strip width = centre-to-centre distance); (2) Columns above and below. Stiffness of equivalent beam accounts for torsional flexibility of transverse slab strips. Moments distributed to column strips and middle strips using specified ratios.
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