how to creat prabolic beam

[shiraz.ansari]

how to creat parabolic beam - for putting reainforcement in it 

 beam profile is varying through out the length of the beam

[conormccartney3897]

You mean like this? (see attached) This was created with a concrete beam family using a sweep for the profile. Then in elevation, create the beam using the curve options. the top radius is set when you draw the beam, the bottom radius is set by depth of the end faces in the type properties and length of the beam ( in other words, can't control the bottom radius!).

[arief.rahman]

Hi,

We create curve or parabolic beam in revit structure but by default we cannot put reinforcement or rebar on that beam.

Regards,

[Joe.Charpentier · Accepted solution]

You could approach this one of two ways.  If you have to do this multiple times, you could create a loadable beam family that has a varying profile along the length.  You can then use the beam tool to create an arc or spline beam (sketching in elevation, as user conormccartney3897 states below.)  

If you have to create a single beam, or multiple beams that are unique, it may be easier to create an in-place beam family.

You will need to use the spline to approximate a parabola- there is no specific parabola tool in Revit.

Also not that Arief’s comment above is not correct.  You can place rebar in a curved concrete beam.  It will be more of a chore to create stirrups along the length of the beam, for two reasons:

-Rebar sets are only linear, so can’t be projected along the curve of the beam.  You will have to place each bar individually. (if you had an arc beam, it might be possible to use a radial array to copy the stirrups along the beam).

-Rebar sets can only have bars of the same size and shape.  If your beam profile varies along the length, you will have to create a different bar at each location.

I hope this helps,

Joe