Composite floor plan
Composite floor plan
(OP)
Attached is a part of a composite floor plan. The particular span is about 27' long. I am trying to evaluate the load carrying capacity of this span.
Reading the plans, I see, beside beam designations few more numbers- (14) and V25 (I have clouded the numbers). I presume, 14 is the total number of studs and V25 is the end reaction. but, seems that the total number of studs is awefully less for a full composite action. Can anyone confirm?
thanks in advance.
Reading the plans, I see, beside beam designations few more numbers- (14) and V25 (I have clouded the numbers). I presume, 14 is the total number of studs and V25 is the end reaction. but, seems that the total number of studs is awefully less for a full composite action. Can anyone confirm?
thanks in advance.






RE: Composite floor plan
RE: Composite floor plan
RE: Composite floor plan
Never, but never question engineer's judgement
RE: Composite floor plan
RE: Composite floor plan
Composite beams are routinely designed for less than 100% composite action. 25% is the minimum, but there is no requirement to go to 100% of composite action.
Assuming the 'V' number is the shear, you have approximately 1.85 kip/ft of load (50k total reaction/27 long).
For kicks I ran the problem assuming 3" deck with 3" concrete (6" total thhickness) and 850 PLF dead load and 1 K/ft LL, and lo and behold, I get a W16x26 with 14 - 3/4 dia x 5" studs. This assumes 50 ksi steel in the beam.
So, it may be fairly reasonably depending on the deck size and concrete cover.
May have made a mistake, as I went threough this fairly quickly, but off the top, it does not seem unreasonable.
RE: Composite floor plan
If the concrete fill is lightweight, then yes, the stud # does look suspiciously low. I would get 22 studs with the deck configuration you list above, and the rest of my assumptions shown above.
RE: Composite floor plan
RE: Composite floor plan