ACI deep beams minimum reinforcement 1

[Gus14]

Due to the lack of good architects , I often find myself forced to design four or even five transfer girders in relatively small structures ( Typically not higher than 4 floors ). A typical example of my case is shown in the attached file. For minimum reinforcement, ACI gives the freedom to specify minimum reinforcement in one direction or two directions "orthogonal grid" as long as we satisfy the mentioned equation. However, AASHTO advises the designer to use an orthogonal grid only. So should I stick to the ACI method and only specify in one direction " Stirrups " as it is easier in construction or should I go with AASHTO and specify orthogonal grid?

Sidenote,
I do follow the ACI method for the design.

Typical Case,

https://files.engineering.com/getfile.aspx?folder=07ab215e-d0c4-4d58-aaf7-cd5c6e231eb2&file=TG.pdf

AASHTO vs ACI quotes,

https://files.engineering.com/getfi...43ef-8902-da986b128b9c&file=AASHTO_vs_ACI.PNG

 

[Settingsun]

I would reinforce that as a regular beam: btm reinf; top reinf to hang stirrups and for incidental hogging at supports; stirrups (perimeter and extra internal leg/s, not the AASHTO detail of overlapping closed ties); and 2-3 side face bars.

 

[Gus14]

Thank you steveh49 for replying, I follow the same detailing method you mentioned but I prefer closed ties. However, it was scary to know that I was going against AASHTO. But I only do private residential projects.