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| Required Size of RCC Column for 4 to 5 floor Building |
Beam width= C/C distance between adjacent slabs (perpendicular to the span direction)/12. Generally architect will ask to restrict width to 250 mm (little more than width of wall).
Suppose you got the width of the beam as 350mm by using the above stated thumb rule and the effective depth of the beam was 700 mm (as per the effective depth thumb rule). Then, use the following equation to determine the increased effective depth. 350 x 700^2=250 x d^2.
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