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# What happens if beam depth is larger than 1/4 of clear span?

## What happens if beam depth is larger than 1/4 of clear span?

(OP)
Hello respected engineers, i have two questions:

As per ACI 318 - 21.5.1.2. the clear span of a beam must be at least four times its effective depth. What would be the implications or consequences if clear span is to be made shorter than 4 times the effective depth?

Also, beams are allowed to be wider than the supporting columns as noted in ACI 318 - 21.5.1.4. That goes to say that also applies to the depth of the beam right?

I would appreciate any response and i hope everyone have a nice day!

### RE: What happens if beam depth is larger than 1/4 of clear span?

#### Quote (As per ACI 318 - 21.5.1.2. the clear span of a beam must be at least four times its effective depth. What would be the implications or consequences if clear span is to be made shorter than 4 times the effective depth?)

This is SMF beam requirement .. If (ln/h)< 4, it will not be SMF . Pls also look deep beams..

#### Quote (Also, beams are allowed to be wider than the supporting columns as noted in ACI 318 - 21.5.1.4. That goes to say that also applies to the depth of the beam right?)

This is another SMF beam requirement ..

21.5.1.4 — Width of member, bw, shall not exceed width of supporting member, c2, plus a distance on each side of supporting member equal to the smaller of (a) and (b):
(a) Width of supporting member, c2, and
(b) 0.75 times the overall dimension of supporting
member, c1.

This is upper limit for the beam width for SMF ..

Tim was so learned that he could name a
horse in nine languages: so ignorant that he bought a cow to ride on.
(BENJAMIN FRANKLIN )

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