Scan-and-Solve for Rhino

Simulate Early, Simulate Often... In Rhino

As to expression of uniform load in Scan&solve

To whom it may concern

We are testing behavior of Scan&solve structural simulation by checking
simple models.
In this case, a 50mm×50mm×1000mm square pipe is cantilevered.(an edge is
free and the other fixed)
This cantilevered pipe has uniform load on the top face.

Our setting is as below.
1)"Material"="Steel AISI 1020"
2)"Restraints"= an edge is fixed. (I.e. section profile of square pipe
is fixed at one side.)
3)"Loads"=Top face. "Surface load"=Vector Force=(Fx、Fy、Fz)=(0,0、-
100)〔N〕
(I.e. loading 100N towards -Z direction on top face of square pipe)

Here is our question.
When we set "Loads", we can see arrows on the model, which shows the
direction of forces.
However, the distribution of these arrows is dense at both edge of the
cantilever and less in the middle.
(So, it looks not uniform)
This is why we are worried.
Does this mean that force is uniformly loaded on the top face?
If yes, why these arrows are not uniformly distributed?

To proceed our research, we have to understand the behavior of your
simulation.
We would be grateful if you kindly reply to our question.
Thank you very much in advance.

Best Regards
Yuki Imai

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Hello Yuki,

Your applied load is distributed uniformly on the top face.

The disconcerting arrow distribution is an artifact of the surface mesh we get from Rhino.  It has a concentration of small triangles near the ends:

The arrows are applied at the centroids of triangles and the concentration of small triangles leads to the concentration of arrows.

During the solving process, a different (and unrelated) algorithm is used to integrate your load uniformly into the solution.

Does this help?

~Michael

Thank you。
Let me in the reference.

yuki

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