sloped beam system

[kafka]

Hi All,

I dont use Revit Structure but just Revit Architecture and I need to model a sloped woden roof with a beam system underneath!
I have rafters and perpendicular joists based on a sloped plane. What is the best way to model this? Any tutorial AU papers where can I learn from?

Thanks,

Giulio

[Alfredo Medina]

First, make sure that the two types of structural members are loaded in the project, let's say, type A for the main members, and type B for the secondary ones. Do the roof. Then, use Home > Work plane > Set, and specify the bottom face of one side of the roof as the new work plane. Then use Beam system; use the edges of that side of the roof as your sketch. Specify the direction for the type A members in relation to the sketch. Specify spacing and other settings in the Beam system properties. Finish the first beam system. Move the work plane up so that it aligns with the top of the main members. Do the second Beam system with type B members in the other direction. Finally, you need to adjust the location of the roof so that it is above the secondary members.

[cliff collins]

To Alfredo,

That was a superb explanantion.



To the original post--

Where did the image come from, and how was it generated?

just curious...............

cheers

[kafka]

First, make sure that the two types of structural members are loaded in the project, let's say, type A for the main members, and type B for the secondary ones. Do the roof. Then, use Home > Work plane > Set, and specify the bottom face of one side of the roof as the new work plane. Then use Beam system; use the edges of that side of the roof as your sketch. Specify the direction for the type A members in relation to the sketch. Specify spacing and other settings in the Beam system properties. Finish the first beam system. Move the work plane up so that it aligns with the top of the main members. Do the second Beam system with type B members in the other direction. Finally, you need to adjust the location of the roof so that it is above the secondary members.

mhh how can I move the workplane up? creating a new one? I want these wotkplanes to be constrained to the roof slop angle so If I change it the beam systems adapt accordingly..

thanks for your reply!

[kafka]

To Alfredo,

That was a superb explanantion.



To the original post--

Where did the image come from, and how was it generated?

just curious...............

cheers

it's been generated in sketchup

[cliff collins]

kafka,

Ah--SU!!

For the work planes, try drwing sloping reference planes in a section or elevation,
and in their peroperties name them " top of roof" "underside of beam" etc.
then when selecting which workplane to sketch on or make current you can select the named reference planes.

cheers

[kafka]

kafka,

Ah--SU!!

For the work planes, try drwing sloping reference planes in a section or elevation,
and in their peroperties name them " top of roof" "underside of beam" etc.
then when selecting which workplane to sketch on or make current you can select the named reference planes.

cheers


Hi there,

I tried actually...but then even if I use "select existing edge" it seems detached from the roof slope angle so if I change the slope angle in the roof then dont adjust to the new position...

what I am doing wrong?

[kafka]

I tried Alfredo methos and it's fine as I can keep the beam system constrained to the roof sloping, but the I cannot offset the roof level to leave room for the beams then..
Is there a way to keep newly created planed aligned with the roof sloping angle? I couldnt do it..

please see attached file

[Alfredo Medina]

The roof structure in the Revit file you posted is already following the slope of the roof. I changed the slope, and the structure adjusted accordingly.

You can use the Edit Work plane tool to change the plane of a beam system. I noticed that you didn´t use the bottom face of the roof to start, but the top.

Follow this order, from top to bottom:

Beam system with Type B (secondary members) is aligned with the bottom plane of the roof.
Beam system A (primary members) is aligned to the bottom face of the secondary members.

[kafka]

The roof structure in the Revit file you posted is already following the slope of the roof. I changed the slope, and the structure adjusted accordingly.

You can use the Edit Work plane tool to change the plane of a beam system. I noticed that you didn´t use the bottom face of the roof to start, but the top.

Follow this order, from top to bottom:

Beam system with Type B (secondary members) is aligned with the bottom plane of the roof.
Beam system A (primary members) is aligned to the bottom face of the secondary members.

Hi Alfredo,

I did actually start with bottom face...:( why you say not?

I am getting confused now. Type B is the smaller one in your image?
How did you offset a beam system from a reference plane it belongs to? or.. how did offset then the roof without moving the beam systems (Im assuming both systems are still attached to the roof's planes).?

[Alfredo Medina]

Begin with a workplane at the bottom face of the roof. Do the beam system for the secondary members. Use the bottom face of the secondary members as the new workplane. Do the beam system for the main members. Since the secondary members are aligned to the roof, and the main members are aligned to the secondary members, if the slope of the roof changes both the secondary and main beam systems will follow the slope of the roof.

Note: even though you can use the "Orient to plane" option from the Wheel's menu to see a plane perpendicular to the view, it might be easier to draw the sketches for these beam systems from a 3D view.

[kafka]

Begin with a workplane at the bottom face of the roof. Do the beam system for the secondary members. Use the bottom face of the secondary members as the new workplane. Do the beam system for the main members. Since the secondary members are aligned to the roof, and the main members are aligned to the secondary members, if the slope of the roof changes both the secondary and main beam systems will follow the slope of the roof.

Note: even though you can use the "Orient to plane" option from the Wheel's menu to see a plane perpendicular to the view, it might be easier to draw the sketches for these beam systems from a 3D view.

Much clearer now -- excellent explanation as well.!!! thanks you very much for this!

Another thing..
see attached pic

In past I used to model a mass with a sloped face where to align the RP of my beam system. Do you know why the picked plane is not aligned with the face but it seems arbitrary.
This may cause problems when I want later to re-host a beam system over another surface because the beam system will oriented on the "arbitrary" plane.

Sometimed when I pick a surface to set a plane it aligns correctly ... see picture correctplane.jpg. How can I control this? Just rotating the plane before placing hosted components? Is there a way it will be always aligned with the surface?

Many thanks again!

[Alfredo Medina]

I have seen that, but I don't know why it happens. It probably has to do with the current point of view. However, the blue grid is just a representation of an infinite plane, that is indeed aligned to the face you have selected anyway. I would say, just ignore the rotation. It does not affect anything.

[cliff collins]

Use a Section or Elevation view and draw a Reference Plane at the slope/angle
and exact location you want the work plane set at. Then name the new Ref. Plane.

Then when starting to sketch, select the named reference plane to sketch on
and place the beam system. This way, the beam system will remain attached
to the ref. plane, and if you change the slope of the ref. plan the beam system moves
and adjusts with it.

cheers.......