Truss Family Enhancements - Truss Depth

[SeanSpence]

Truss Depth

Issue: Trusses are always detailed with a truss height defined. Currently when using the truss family template the top and bottom chords are located by there center of gravity/Center "y" location. Hence the height of the truss varies depending on the size of the top and bottom chord members See below

As you can see, there is a WT bottom chord and a Wide Flange Top chord. each has different depths, while the center to center of these members is 10'-0" the Out to out size is different.

The only way to fix this is to look up the different sizes of the top and bottom chord and subtract half of their depth from the truss depth. While this works it is not ideal. The truss depth has to vary from truss type to truss type depending on the sizes used. when chord sizes vary by small fractions of an inch, truss depths become in accurate. Out to Out of truss is what is important when modeling, not analytical location to analytical location.

Suggestion: Allow the graphical location of the element being used as a top or bottom chord be defined as top or bottom. Currently only the analytical location can be defined.

[SeanSpence]

This suggestion and others titled Truss Family Enhancements were part of a larger post that has been broken up in order to enable developer workflows.

Please click and vote for each one below

Thanks

Sean

truss-family-enhancements-more-web-member-types

truss-family-enhancements-truss-types

truss-family-enhancements-truss-depth

truss-family-enhancements-truss-gusset-web-connections

truss-family-enhancements-truss-top-and-bottom-connection

truss-family-enhancements-z-offset-value

truss-family-enhancements-automatic-member-coping

[haedicu]

Thank you for this suggestion. We will be further evaluating this one in the near future and will keep you posted if we need any additional feedback or clarification. Please feel free to continue voting on this one as it will help us with the continued evaluation.

best regards

Udo

[adrian.calabria]

Hi guys. How is the review going?

[SeanSpence]

Another issue related to this,

When connecting a beam / purlin, bottom chord strut etc to the truss. the beams snap to the analytical line of the truss not to the top or bottom of the truss chord members. you can overcome this by selecting the element of truss (top or bottom chord), un pinning, and setting justification to the top/bottom. problem with this is, that the geometry of the truss changes. The web members of the truss are set by the intersections of their center of gravity/ center not the top and bottom. Hence changing the top and bottom chord offsets of top and bottom chord members moves the locations of the connected web members creating conflict resolution and fabrication / detailing problems.

[kimberly.fuhrman]

In an effort to consolidate threads, we are updating this thread to Gathering Support. We are continuing to evaluate where this request falls into our roadmap and will provide an update when we have made a decision. 

We are in the process of improving and consolidating the Revit Ideas. This is by no means a downgrade...simply part of our cleanup efforts. Rest assured that your Idea and feedback is valuable to our teams, and that your Idea will continue to be reviewed. 

The Factory