Absolute position of deflection

[SteveG021]

Hi

I want to know the distance between two rows of parrlael bars after being loaded (as they have to fall within a limit).

I am thinking of comparing the displacements of the nodes, and then taking the deflections of the bars into consideration. Unless there is an easier way to extract this infomation?

The problem I have is I don't know where the maximum bar deflection takes place. I see under Maximum bar deflections you can tick the location box; which then displays the Coord. UX,UY and UZ.

These values range between 0-0.99. See attached screen capture.

Can you please give an explanation for these values? 

Thank you

[Rafal.Gaweda]

See below : the same bar Deflection table with different settings

[Rafal.Gaweda]

or:

[Rafal.Gaweda]

These values range between 0-0.99. See attached screen capture.

Can you please give an explanation for these values? 

Relative position : example  : 0.5 *L measured from start node of bar

(L=bar length)

[SteveG021]

Thanks for the reply Rafal.

Those two methods give the bar displacements; does this include local bar deflections? Or do they need to be added?

As I want to know the actual distance between the two bars for a given load case (highlighted in red inBerth.JPG).

In terms of relative position of the bar: 

Relative position : example  : 0.5 *L measured from start node of bar (L=bar length)

I did a simple model (Structure.rtd attached)

Pinned supports with a load at 1/3L, 0.5L and 2/3L; but the results are not 033,0.66 as expected? Am I doing something wrong?

 Thank you

[Rafal.Gaweda]

Those two methods give the bar displacements; does this include local bar deflections? 

Yes.

I did a simple model (Structure.rtd attached)

Pinned supports with a load at 1/3L, 0.5L and 2/3L; but the results are not 033,0.66 as expected? Am I doing something wrong?

See below:

[SteveG021]

Ok great that it includes the local bar deflections.

Sorry in terms of you reply to the model, for case 21 (5m):

UZ = -77mm

Coord UZ = 0.45

Therefore Position on bar  = 15*0.45

                                                = 6.75m

But on the drawing it is 6.90m??

[Rafal.Gaweda]

So use Characteristic Points to be the most accurate

[SteveG021]

Ok, thanks.

I noticed something else.

I selected Max deflections with locations, but noticed that the Coord columns refer to different bars and load cases? See attached.

Eg.

UZ:                  Max 1.15mm @ Bar 643, Case 919

Coord UZ:      0.90                @ Bar 634, Case 956

Can you help explain? 

Thanks

[Rafal.Gaweda]

File please.

[Rafal.Gaweda]

This table behaves like every other results table.

Global extremes are searched within each column data so Coord UX Coord UY Coord UZ presented on Global Extremes tab presents max min values of these columns results - not related to UX UY UZ values.