Beam Element

[reza abdollahi]

Hello everyone, 

For my model, I am using beam elements with element formulation type 1. I try to investigate other types of element formulation such as 2,4,5,11,12, and 13. which I come to the error of: 

 *** Error 20225 (STR+225)
     orientation node for beam element # 9576 is undefined
 
 *** Error 20211 (STR+211)
     reading element card for beam element
     undefined node # 0
       9576         6     14762     14763         0         0         0
     The input phase will continue if possible
 So, I didn't define node third, which is impossible for my complicated geometry.  

P.s. I want to try different element formulations because I am looking for any luck with instability in my model. This instability comes from releasing the beam elements from tied contact and sudden distortion. 

Best Regards,

Reza Abdollahi

[James M. Kennedy]

Dear Reza,

 

Nodal point 3 for orientation. The third node, N3, is optional for beam types 3, 6, 7, 8, and,

if the cross-section is circular, beam types 1 and 9. The third node is used for the discrete

beam, type 6, if and only if SCOOR is set to 2.0 in the *SECTION_BEAM input, but even

in this case it is optional. An orientation vector can be defined directly by using the option,

ORIENTATION. For this case N3 can be defined as zero.

 

Remarks:

 

1. Beam Orientation. A plane through N1, N2, and N3 defines the orientation of the principal

𝑟-𝑠 plane of the beam; see Figure 17-1.

 

https://ftp.lstc.com/anonymous/outgoing/jday/manuals/DRAFT_Vol_I.pdf

 

Sincerely,

James M. Kennedy

KBS2 Inc.

July 21, 2022

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