How to define reference point of user defined profile in cross section editor

SOFiSTiK SOFiPLUS
#1

Hi, could anybody help to explain how should i define the reference point of a user defined profile in cross section editor. i know there is a selection in standard cross section defination dialogue window. but how do we define in user defined rofile.

#2

In the cross section editor, the origin of the coordinate system is taken as the reference point. Here are two images with a centric and an eccentric cross section in the cross section editor.
cent

eccentric
eccentric711×620 13.4 KB

If you assign these cross-sections to structural lines and mesh them, you get this picture:

#3

result
result820×515 2.49 KB

#4

Hi Birgit, i follow your comments do the steps below, but the 2 C profile are not connected by flange surface.
1 what i want to model like the figure below(flanges of C profile touched, load should be able to transfer between these 2 C profile)
2 I follow your commenst to draw the cross section and system as below:
3 The 3D model is like below(C profile crossing, not flange connected each other)

image
image849×508 61.8 KB

#5

Hi,

have you selected the ‘eccentric beam’ option in the structural line dialog?
sln

#6

Hi Birgit. yes, i just forgot to select ‘eccentric beam’, now it got fine. BTW, if i have another surface panel on top of Beam 1 with some gap(for example 50mm) between them. then i have to define a point at surface and a point at beam 1 then use point constrain to link them, right?

#7

Hi,
I assume the other “surface panel” is defined with a structural area? Then you have to create a spring or coupling between structural lines.
So you have to define an additional structural line on the structural area (the other structural line already exists) and connect them.

Birgit

#8

Hi, Birgit. Appreciate your help. i have two questions below:
1: Define an additional structure line, i should define this structural line as element type ‘No cross section’, right? because that will not add additional stifness to the surface area
2: Regarding the spring or coupling, i assume you mean ‘line link’ or ‘line constraint’, right? But when i click ‘line constraint’, and then select two structral lines, nothing happend. what is the reason?

#9

Hi,
1: Yes
2: Yes, ‘line link’ or ‘line constraint’. Please always note the text in the command line of AutoCAD / SOFiPLUS-X. You first select all source structural lines, then you finish your selection with return and then you choose the target line.

#10

Hi Birgit:
Yes, it solved. Thanks a lot for all your help in steps.