Corotational Trans. Error message

[mmasoudi]

Hi, I have tried to model a single beam having a 4 m length with 9 equal length elements using the Corotational transformation.
I got the following error and Interpreter windows was closed immediately. However, it works fine with 4 elements.
Any suggestion?

CorotCrdTransf3d computeEleLengthAndOrien: 0 length
ElasticBeam3d setDomain--Error initializing coordinate transformation

[vesna]

The message indicates that there is an element with zero length to which you trying to impose corotational transformation. You may have an error in setting up the coordinates.

[mmasoudi]

The coordinates of the nodes are fine. However, it seems that 0.4 m is considered zero by Opensees. When I change the length unit from m to cm or mm everything works fine. My intention is to subdivide a 4m beam to 10 elements.

[vesna]

If you add, subtract, multiply or divide two
integer numbers the result is an integer

expression like this:

set len [expr 4/10]

is zero.

But, expression like this:
set len [expr 4./10]
is 0.4

[mmasoudi]

Yes, that was the problem. Thanks for your help.