Reinforced Concrete beam advice required
Reinforced Concrete beam advice required
(OP)
i am starting a new house project and would like some advise with regards to the design of a concrete beam.Tthe detail for the Reinforced concrete beam which sits above the garage is described below:
Beam size: 12" wide x 20" Depth
Top Reinforcement: 6x5/8" Rebar at 1/3 span to the ends of the beam. the Center 1/3 is reinforced with 3x5/8" rebar.
Bottom reinforcement: 6x5/8" Rebar for the center 1/3 span. 1/3 of the span on the ends is reinforced with 3x5/8" rebar.
The contractor has indicated that the quantity of of reinforcement may create an issue when pouring concrete and may cause voids. he has suggested that the rebar diameter be changed from 5/8" to 1" and reduce the quantity of rebar to 6 pieces (3 to the top and 3 below).
can someone with construction experience/knowledge provide some advise on this?
Beam size: 12" wide x 20" Depth
Top Reinforcement: 6x5/8" Rebar at 1/3 span to the ends of the beam. the Center 1/3 is reinforced with 3x5/8" rebar.
Bottom reinforcement: 6x5/8" Rebar for the center 1/3 span. 1/3 of the span on the ends is reinforced with 3x5/8" rebar.
The contractor has indicated that the quantity of of reinforcement may create an issue when pouring concrete and may cause voids. he has suggested that the rebar diameter be changed from 5/8" to 1" and reduce the quantity of rebar to 6 pieces (3 to the top and 3 below).
can someone with construction experience/knowledge provide some advise on this?






RE: Reinforced Concrete beam advice required
RE: Reinforced Concrete beam advice required
BA
RE: Reinforced Concrete beam advice required
RE: Reinforced Concrete beam advice required
TX,
the beam is fixed to a concrete frame which supports the top concrete floor. If the 1" bars are used as i described (3 to the top and 3 on the bottom), the requirements of the original design will be satisfied (with respect to steel area in the different sections of the beam) and the bars will be continuous. The difference in cost is really negligible. I just wanted to know if my thinking on this subject was correct. I am obviously not a structural engineer.
RE: Reinforced Concrete beam advice required
Brian C Potter, PE
http://simplesupports.wordpress.com
RE: Reinforced Concrete beam advice required
Is it possible that the original design intended for the bars to be in two layers?
RE: Reinforced Concrete beam advice required
Since you are not a structural, you do need to engage one before making changes (working outside of ones expertise is a good way to get sanctioned) It should be a very small or no fee decision, but the nuances are not easily explained here.
It may also be possible to simply bundle the #5 bars into pairs, with the same effect as changing bar sizes, but not changing the material requirements.