stairs reinforcement - how to detail at best? logic or purely in plan?

[lolobau]

Hi

it is a long debate in our office how to detail the staircases at best. There are different opinions so that's why I would like to hear your opinion

I believe that a reinforcement drawing must make things clear and easy to understand for the steel fixer. That's why i would even indicate in the layout bend bars as "bend bars" whereby they should be in the plan view just straight.
See attachment

What is your opinion? How would you indicate your re bars in the layout? Bend? to make things more clear or "correct in plan" just streetlight?

lolobau

 

[lolobau]

http://files.engineering.com/getfile.aspx?folder=5d27bb40-ae28-4122-9607-708c132381db&file=A.jpg

http://files.engineering.com/getfile.aspx?folder=44ec0b0f-a4f1-41f9-8086-51c6ba59cda4&file=B.jpg

 

[RPMG]

We typically do not show a plan for stairs, but I like the bent bars option. Add a note, "Long bars are not skew. Long bars are shown skew to indicate vertical bends, for clarity."

 

[hokie66]

There are a number of ways. The way it is done most frequently where I am is to schedule the flights. Each flight or type has a number, and the typical cross-section shows the type of bars which go in the schedule.

 

[lolobau]

@hokie66 so you would not show the the plan (layout) of the stairs at all? just the sections? in which scale?

 

[hokie66]

I think it is fairly typical to just show the beginning of stair flights on floor plans. The stair geometry is best left to the architectural drawings, so let the architect define how the stairs work. It depends on how complicated the stairs are, as sometimes for clarity you have to show the flights in plan and identify the different types.

Concrete sections should normally be shown at 1:20 scale, so that is what I would want.

 

[lolobau]

ok, then we will do so
just that the scale is quote odd 1:20?
we usually go for 1:25

althought I belive it must be shown as large as possibel if the drawin has the space. Why not blow it up to 1:18 for example if it fits on the drawing. You anyway are not allowed to measure ( to scale) from the drawing so why not showng thigs as clear and big as possibel

by reinforcement drawings like for example stairs fligh sections. Would you really indicate the scale? or also blow them up? basicaly explode the section? to achieve such an diagram

 

[hokie66]

Where I am, our typical scales for structural drawings are 1:100, 1:50, 1:20, 1:10. 1:25 is rare, and I have never heard of 1:18. We always include the scale, unless it is not to scale, which we indicate NTS.

Your section looks good. The top bar labelled 7 is probably not required full length, but I would put a bend on the bottom end.