Adjusting Joist Brg Conditions

[nhugley]

this has been a problem for me for some time now and I might have a handle on what going on so I can explain the issue.

With K series joist I get 2 different grips (in an elevation view) the dot grip which adjusts the analytical model (orange line) and it adjusts the overall length of the joist. The dbl arrow grips let's me adjust the physical end condition without changing the analytical model line. This adjusts both ends equally. Marie has an advanced modeling white paper that shows how to adjust the family to adjust each end differently, no problem.

Now the LH series joist there is only one grip (in an elevation view) the dot grip which adjusts the analytical model (orange line) and it adjusts the overall length of the joist. I don't get to adjust the end conditions. I looked at the family and it's created different than the K series so applying Marie's white paper doesn't apply.

This leads me to my issue.

For both joists I want to be able to adjust the physical length of the joist for the actual bearing condition and leave the analytical line alone. But analytical line has everything to do with the overall length of the joist. Meaning if I adjust the analytical line to get the bearing condition to look correct the analytical lines won't intersect for the analytical model to be correct. See attached .dwf.

Maybe I shouldn't be worried because it's covered in the Analytical Model Setting "Tolerances"?

[sportdraft]

Where can I find this white paper?

[kmarsh]

Hi,
Which version of Revit Structure are you using?
-ken

[sportdraft]

Revit Structure 4

[kmarsh]

Sorry, I was curious about which version was being used by nhugley. I'll look into the white paper location for you.
-ken

[nhugley]

sorry for taking so long to get back to this post.

attached uis the .pdf i used to extend the k series joists, there are few other goodies
in this file

also i'm using revit 3 and have 4 in hand but haven't loaded yet

thanks

nick

[sportdraft]

Thanks for the info just what I needed

[morganpm]

There is so much more necessary to this picture. Essentially if you have an extended end on a joist, the line representation on the drawing is different than typical bearing condition. The plan line should actually overlap the bearing framing.
How often do you have a joist that requires extended end on both sides of a joist. And how often are they the exact same length. These features should already be incorporated into the family not required by the user to implement.

[jrichardson]

I would tend to agree. I have added these parameters to the joist families. "Left Bearing End-Right Bearing End-Left Joist Extension-Right Joist Extension" Had to modify the visibility of the bottom/sloped chords so a phantom2 linetype would display in plan. Otherwise it would sometimes display solid because it is technically lines on top of lines. Add in detail lines to show the visual of a joist extension.

We typically do not show our joist just short of the support like beams are shown. The joist line in plan is typically shown 2/3 the length of the span. It would be nice to have a little better control over this.

These types of things should be built into the Revit Libraries. Hopefully soon they will be. It would also be nice if there was a better indication if families like this were revise from version to version. This way I would not have to recreate these additional needed parameters each new release that they do not show up in. My fear is if I don't do this the new family may have a feature in it that I could benefit from.

jamie

[rmcelvain.103137]

I agree that the ends should flex separately out of the box. And it would be very nice if there was a visual indicator showing you which end was which (i.e. instead of right extension and left extension there could be red extension and green extension; then there could be a red dot at one end and a green dot at the other - green for start, red for end).

Just wanted to add my 2 cents,