topic Re: Stringer not following the stair path in Revit Architecture Forum

Stringer not following the stair path

raysanziaei — Wed, 01 Sep 2021 03:50:25 GMT

I am new with stair supports. We have a sort of complicated stair with stringers that I need to model. Here are the issues: stringer cuts at the landing:

raysanziaei_0-1630467908423.png

Second, stringer has a gap with the stair:

raysanziaei_1-1630467977249.png

and third, the bottom of the stringer is not smooth and it looks like steps:

raysanziaei_2-1630468022267.png

The last issue happens with the railing too.

Here are photos of the actual stair to help understand the condition:

raysanziaei_3-1630468093165.png

raysanziaei_4-1630468182056.png

Re: Stringer not following the stair path

barthbradley — Wed, 01 Sep 2021 05:01:13 GMT

Post the file.

Re: Stringer not following the stair path

raysanziaei — Wed, 01 Sep 2021 05:33:27 GMT

I am sorry but I don’t think we are allowed to share the file. Thank you

Re: Stringer not following the stair path

yes_and_no — Wed, 01 Sep 2021 05:58:06 GMT

Do you need this perfection for construction document or presentation ? The presentation looks fine to me.

Re: Stringer not following the stair path

raysanziaei — Wed, 01 Sep 2021 15:28:41 GMT

It needs to look right as we are moving to construction documents

Re: Stringer not following the stair path

raysanziaei — Wed, 01 Sep 2021 16:13:46 GMT

Ok. I don't know why i didn't think of this before but here's the stair in a separate file. Would this work?

Re: Stringer not following the stair path

barthbradley — Wed, 01 Sep 2021 17:33:15 GMT

This is a tough one; no doubt. It would take me some time and effort. I would probably have to use some workarounds to get there. But here's a quickie to examine. Note that two Stairs are used instead of one.

Stair91.png

...an example of a "workaround" I'd likely employ, would be to model the Stringers In-Place (e.g. Architecture Tab=>Component=>Model In-Place). Of course the treads/risers would be done as a Stair Type, but without Supports.

Re: Stringer not following the stair path

ToanDN — Wed, 01 Sep 2021 17:52:04 GMT

See attached.

ToanDN_0-1630518699720.png

Re: Stringer not following the stair path

raysanziaei — Wed, 01 Sep 2021 19:54:28 GMT

So you made 2 separate stairs. For the modeling the stringer in place, did you do sweep? and how would the path know to follow the slope of the stair? also, if they are modeled in place, how come they show up as stringer in the stair? shouldn't they be separate? This seems like trouble as we are going to need to build new guardrail and that is installed on the stringer so the stringer needs to be as accurate as it can be

Re: Stringer not following the stair path

raysanziaei — Wed, 01 Sep 2021 19:57:24 GMT

Would you please explain how you did this? also , there is a jump in the stringer on the outer ring which needs to be smooth

raysanziaei_0-1630526231028.png

Re: Stringer not following the stair path

RDAOU — Wed, 01 Sep 2021 19:59:08 GMT

@raysanziaei

Model the stair with no stringers and add stringer using a sweep (you can add a massed surface and pick edges for the path)

Re: Stringer not following the stair path

barthbradley — Wed, 01 Sep 2021 20:30:07 GMT

The stringers in the RVT I posted are regular Supports - not In-Place Modeled components. What I said, is that I would model the Stringers In-Place if it was my task -- assuming the right and left stringer are supposed to be contiguous and unbroken from beginning to end like they appear to be in your photograph. It ain't easy though, but it's doable.

Re: Stringer not following the stair path

ToanDN — Wed, 01 Sep 2021 20:53:56 GMT

@raysanziaei wrote:

Would you please explain how you did this? also , there is a jump in the stringer on the outer ring which needs to be smooth

Ok here is the one with a smooth stringer transition. I created the stair with two runs and a landing. Edit it and edit sketch of each run and landing to get the idea.

ToanDN_0-1630529616400.png

Re: Stringer not following the stair path

raysanziaei — Thu, 02 Sep 2021 17:23:42 GMT

Would you please explain step by step what you did? I can't make the stringer look right at the landing

Re: Stringer not following the stair path

raysanziaei — Thu, 02 Sep 2021 17:25:01 GMT

Thank you but I need more direction to be able to get this done.

Re: Stringer not following the stair path

ToanDN — Thu, 02 Sep 2021 17:33:09 GMT

@raysanziaei wrote:

Would you please explain step by step what you did? I can't make the stringer look right at the landing

In order to create a smooth transition, the boundary arc of the landing and the boundary arc of the stair run need to be tangential. In other word, they are two segments of the same arc.

ToanDN_3-1630603981289.png

ToanDN_2-1630603913136.png

Re: Stringer not following the stair path

raysanziaei — Fri, 03 Sep 2021 19:00:14 GMT

Why this stringer slopes up?

raysanziaei_0-1630695510526.png

I think these are tangent, but it still breaks and not smooth. what am I not seeing here?

raysanziaei_2-1630695610442.png

Re: Stringer not following the stair path

ToanDN — Fri, 03 Sep 2021 19:07:48 GMT

@raysanziaei wrote:

Why this stringer slopes up?

raysanziaei_0-1630695510526.png

I think these are tangent, but it still breaks and not smooth. what am I not seeing here?

raysanziaei_2-1630695610442.png

You, again, modeled the stair as a continuous sketched run. When there is no actual landing, Revit just assumed that 'landing' is a large tread and stringer sloped to follow the tread.

Open the file I revised and attached earlier and reverse engineer it.

Re: Stringer not following the stair path

raysanziaei — Fri, 03 Sep 2021 20:44:47 GMT

Thank you. Now I have the landing stringer corrected based on what you said but still can't get this discontinuity fixed. We field verified the length of the treads so I can't modify the tread lengths to come up with a tangent arch.

raysanziaei_0-1630701833768.png

raysanziaei_1-1630701873163.png

Re: Stringer not following the stair path

raysanziaei — Fri, 03 Sep 2021 20:49:01 GMT

Also, for some reason, the top riser doesn't meet the second floor lever. Although I have the "top level" set to "second floor".

raysanziaei_1-1630702136954.png