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Moment of resistance of a beam is directly proportional to its second moment of area (moment of inertia of cross section). Moment of inertia is proportional to the cube of depth (for a rectangular section). The formula is MI = W x D^3 / 12 Hence doubling the depth increases the moment of resistanceRead more
Moment of resistance of a beam is directly proportional to its second moment of area (moment of inertia of cross section). Moment of inertia is proportional to the cube of depth (for a rectangular section).
The formula is MI = W x D^3 / 12
Hence doubling the depth increases the moment of resistance by eight times while doubling the breadth increases the moment of resistance two times.
I believe there is a greater benefit in increasing the depth rather than the breadth.
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