SHEAR STRENGTH OF CONCRETE BEAMS PROVIDED BY REINFORCEMENT
SHEAR STRENGTH OF CONCRETE BEAMS PROVIDED BY REINFORCEMENT
(OP)
Fellow structural engineers, I know the code limits the contribution of shear reinforcement to shear strength to 8 SQRT f'c bw d. But I'm interested in hearing your personal maximums, your engineering judgments on the matter. What do you personally prefer to limit the shear contribution to before you consider increasing concrete strength or beam size? Thank you in advance for your time and input.






RE: SHEAR STRENGTH OF CONCRETE BEAMS PROVIDED BY REINFORCEMENT
RE: SHEAR STRENGTH OF CONCRETE BEAMS PROVIDED BY REINFORCEMENT
RE: SHEAR STRENGTH OF CONCRETE BEAMS PROVIDED BY REINFORCEMENT
The reason being that the shear equation tends to be conservative to begin with. Add to it the fact that most engineers are fairly conservative with loading, and the fact that shear strength of concrete is proportional to sqrt of f'c and f'c in the field will usually be quite a bit higher than specified, you'll have extra layers of "feel good".
RE: SHEAR STRENGTH OF CONCRETE BEAMS PROVIDED BY REINFORCEMENT
There could be exceptions, but ordinarily, I would increase the beam dimensions unless forced to do otherwise by architectural or other constraints. In such a case, stirrup spacing could become an issue for placement of concrete.
BA
RE: SHEAR STRENGTH OF CONCRETE BEAMS PROVIDED BY REINFORCEMENT
RE: SHEAR STRENGTH OF CONCRETE BEAMS PROVIDED BY REINFORCEMENT
RE: SHEAR STRENGTH OF CONCRETE BEAMS PROVIDED BY REINFORCEMENT
RE: SHEAR STRENGTH OF CONCRETE BEAMS PROVIDED BY REINFORCEMENT
BARetired has my thoughts also.
RE: SHEAR STRENGTH OF CONCRETE BEAMS PROVIDED BY REINFORCEMENT
Yeah concrete is cheap and stirrups are expensive, but when you have to transfer a large load with limited space, triple #6 stirrups come in handy. This limit also applies for torsion beams which I've designed a couple of too.
I don't understand why we would limit ourselves to less than the allowed unless we had additional information to contradict the testing and immense amount of research already expended on this issue.
RE: SHEAR STRENGTH OF CONCRETE BEAMS PROVIDED BY REINFORCEMENT
There are situations where you can't increase the size of a beam for architectural reasons. I have designed max'ed out beams several times. My only real concern is if the people building the structure will get the correct steel in the beams.
RE: SHEAR STRENGTH OF CONCRETE BEAMS PROVIDED BY REINFORCEMENT