Recent content by e104909

Hi, I will be performing a calculation for a temporary support stand for a rebar cage for beams and column rebar assembly. The desired support is not fixed at the bottom. Construction has been using it for a long time with no issues but our client would want to stop the work and have an...

I am working on a project in Kermit and Wink, TX. I was looking for a drainage manual or any drainage design criteria but it seems the entire county does not have any concerns regarding floods in their areas and I cant find any city drainage manual. I've been looking in google maps and can't see...

I guess the correct question is, what difference would it make if I have a single loop vs a c shape stirrups?

I am limited with the number of couplers that can be welded on the 24" steel box column. With that said, i thought of detailing it this way so that 1 single line of reinforcement will be in the middle of 8"thk widening. In actual drawing, i will specify that width to be 32". Do you suggest...

Hi Tom, Thanks for your response. The extension is actually going to be poured with the beam. It is not existing, but it will be integrated with the beam. I'm conservatively ignoring that extended portion in my design. Since I just want to consider the rebars that will be welded to the...

Sirs, I have this 24 inch wide beam that needs to be widened to support a wall on top. The proposed is 8" widening on the side of 24". Attached is the detail. I designed the 24" beam to carry all the framing forces and loadings and as far as I know the widened portion of 8" will just be there...

@HTURKAK, I agree that limitation only applies when your Vu exceeds ф(Vc + 8 fc √bwd) even you provided steel reinforcement that exceeds 8 √fc bwd. Id like to clarify "the stirrups may yield but concrete struts do not crush". In the case where you provided more stirrups that exceeded Vsmax...

@Tomfh, Do you mean to say "after all the stirrups have yielded", when you provide stirrups more than 8*SQRT(f'c)bwd then it will create those diagonal compression cracks? Lets say Vu = 100 kips. фVc = 90 kips. Vs provided is 500 kips. Vsmax = 400 kips. So Vu = 100 kips < 90 + 0.75*400 = 390...

ProgrammingPE, Where did you get diagonal compression capacity? Can you share where I can find that?

ProgrammingPE, R22.5.1.2 states that the combination of concrete capacity and 8*SQRT(f'c)bwd shall be greater than Vu to minimize the likelihood of diagonal compression failure but did not mention any limitation on the shear reinforcement. I have the same exact thoughts as you (thats the...

When is this possible to happen? is it when it exceeds the concrete strength фVc and starts to engage the stirrups? The literature you posted says tension in the vertical stirrups. How do we measure the extent of its capacity until you will notice the cracks in the web? I'm confused with the...

Per ACI 318-14 22.5.1.2, Vu ≤ ф[Vc + 8*SQRT(f'c)bwd] My understanding is that the 8*SQRT(f'c)bwd is equivalent to maximum shear reinforcement that you are allowed to put in your concrete beam section. But I cannot find any wording in the code that this is the limitation in the shear...

Id like to seek your opinion on this case. I am struggling to convince myself with this assumption from a senior engr. The concrete joists (that connects to the girder) in ETABS were released in M22, M33, and T. The actual connection detail of the joist to beam is a standard hook which is fully...

Agent666, Also, is this only required in ACI 318-19 version or it is also in ACI 318-14. It is not very clear in ACI 318-14. (I mean the ties across the width) Regards, E104909 Civ-Str P.E.

@HTURKAK, is there a clause in ACI that talks about the width depth ratio? @Agent666, is this only applicable for hanger reinforcement for shear transfer? I have 24 wide beam and the height is 40". There were 6-#10 bottom bars. Av/s required from etabs is say 1. Vs = Av x fy x d / s = 1 x...