max. spacing between stirrup links in the beams 1

[SBRC]

Greetings,

AS per this thread link

https://www.eng-tips.com/viewthread.cfm?qid=397909As

Majority of engineers refer to ACI 318, 11.4.5 and state that transverse stirrup spacing shall be as prescribed in 11.4.5.1.

In my opinion, ACI speaks about spacing of stirrups perpendicular to longitudinal axis of member which is vertical axis and it specify vertical stirrups spacing(S) not any horizontal spacing of stirrup.

Lateral spacing is of no concern since we calculate "Av" which itself depends on width of beam"bw" More wider beam will need more Av.

Would any engineer shed some light over it?Is my understanding Correct?

 

[r13]

This is a new table to me, never saw it before.

 

[hokie66]

Thanks for that, Agent666. Can I say that we are all on the same page now? The clause 11.4.5.1 which the OP referenced, whichever version that comes from, is for spacing along the axis of the member. And now ACI has added a provision for spacing across the width.

 

[JAE]

Yes a very new provision in 19 - ACI catching up with NZ!

 

[rapt]

JAE,

Good to see ACI is catching up. Been in Eurocodes since their inception, AS codes since 1988 and in BS codes well before that. Obviously one of the areas NZ code decided to overlook ACI when they developed their own code in 2006.

 

[hokie66]

Perhaps it is just because the US has not commonly followed the practice, widespread in Australia, of using wide, flat beams.

 

[rapt]

Neither have the British or Europeans, except possibly some in Spain using PT band beams.

 

[JAE]

hokie66
If you read one of my replies in one of the linked threads I posted above I mentioned that my mentors from Texas, working back as far as the 1920’s would always provide additional vertical legs for beams wider than 30” or so. So I believe a lot of US engineers did that as common knowledge in detailing despite it not being directly required in the code.

 

[hokie66]

JAE,
Yes, I agree, and that is my memory as well from the time I practiced in the US. But I was talking about the use of band beams, usually 1200, 1800, or 2400 wide, and 300 to 900 deep. We never did that in Virginia when I was there.