I recently tried the feature of generating the properties of a built-up section by using the "Tools / Create user table / Add new property" then checking the "Define Profile Polygon" and inputting the perimeter points. I was able to generate the cross-section and the properties, but when I look at the member in the model while rendering "Full Sections" or "Sections Outline", the member is shown offsetted from the local X axis defined by the Start and End joints. I was expecting to see the local X axis going through the CG of the cross section - Is there a way to make this happen?
I'm listing below the input of a simple model where the problem can be observed.
STAAD SPACEUNIT FEET KIPJOINT COORDINATES1 0 0 02 50 0 0MEMBER INCIDENCES1 1 2 START USER TABLETABLE 1GENERALTESTMEMB1.25 1.5 0 1 0 0.175694 0.09375 0.217853 0.202724 0.1875 1.00894 1.06914 -0.401111 0.291667 0.000966092 1.5PROFILE_POINTS -0.5 -0.633333 0.5 -0.633333 0.5 0.366667 0 0.866667 -0.5 0.366667ENDMEMBER PROPERTY1 UPTABLE 1 TESTMEMBSUPPORTS1 PINNEDFINISH
Do you mean the bending moment diagram? You need to go into the post-processing mode and click on the "Mz" and "My" switches as appropriate, to activate the corresponding diagram. This is shown in the attached screen shot. The "Mz" diagram will be activated by default, if you go into the Post-processing > Beam page.
Sudip Narayan Choudhury
Thanks, that's helpful to clarify StaadPro's behaviour with user-defined section coordinates.
However, the point about the graphical misrepresentation of such sections has not been addressed. 3-D rendered images of structures are very useful for visual checking of the structural configuration and also for presentation of images of the structure to the client, checking authorities and fabricators.
Above is an example of the mis-representation of a user-defined section. The circled beam is a triple-web beam which is in fact aligned with the dummy post members below it and the truss node above it. Doesn't look like it though.... the top right corner of the top flange is shown at the location of the centroid of the member.
I checked that the beam is in fact correct by temporarily substituting a standard UB section; all showed correctly with that.
If the visual image is wrong that does not engender confidence in the correctness of the program or its results. You and I may well know that the centroid of the beam is in the correct place and that the analysed results are absolutely correct. However all that 3rd parties see is a beam in the wrong place. That doesn't help the image of either StaadPro or of my skill as an engineer.
I can't imagine it is overly difficult to correct the graphical presentation of a built-up section - please arrange for that to be done for a future StaadPro release.
i am recently working on the nonlinear behavior of structures. so i need to locate the plastic hinge formation and the subsequent behavior after that. i also need to generate a graph (moment vs curvature)and find the load at which it leads to the rupture of the beam. and how am i supposed to do it in staad..