minimum conc. beam size

[wkzt]

I am designing a trellis structure. it measures 6x24 in plan view. the top beams in the long direction are supported by columns at 6' o.c. (e.g. 4 typical spans each 6'-0" long.)
this beam will support very light wood trellis on top.
the beam will be cladded with coral rock veneer for a total dimenssion including finish of 12"X8" cross section.

Question:

1. Can the cross section of the beam be 5"X8.5"?


2. what is the minimum beam size allowed by ACI318?



Thanks.

 

[SperlingPE]

Provide required concrete cover to longitudinal reinforcing. Provide adequate spacing between bars. Is this a two way concrete frame?

 

[L775]

minimum bean size 8x12

but it can be anything smaller by calculations

 

[DRC1]

for cast in place 5" would probably by the minimum width, Assume 2 # 4 bars @ 1/2" dia. ea, 2" clear each side and 1 " between the bars (using 3/4 " agg.)

However I would go at least 6" to give a little more room around the bars.

*.5" high is okay, but you may find it more convient to go 7.5 or 9.5 inches. this would allow you to use 2x8's or 2x10's for side forms.

Good Luck