Midas Gen Warning Message "DOF MAY BE SINGULAR"DISPLACEMENT DZ AT NODE NO. 643 IS ABNORMAL"

Question:

Hi. How to fix this warning message below?

 WARNING : DISPLACEMENT DZ AT NODE NO.    643 IS ABNORMAL.
 WARNING : DISPLACEMENT RX AT NODE NO.    643 IS ABNORMAL.
 WARNING : DISPLACEMENT DZ AT NODE NO.    644 IS ABNORMAL.
 WARNING : DISPLACEMENT RX AT NODE NO.    644 IS ABNORMAL.
 WARNING : DISPLACEMENT DZ AT NODE NO.    645 IS ABNORMAL.
 WARNING : DISPLACEMENT RX AT NODE NO.    645 IS ABNORMAL.
 WARNING : DISPLACEMENT DZ AT NODE NO.    646 IS ABNORMAL.
 WARNING : DISPLACEMENT RX AT NODE NO.    646 IS ABNORMAL.
Answer:Hello,

Thank you for sending your question. I will follow up as soon as possible.
Thank you.

Best regards,
Jihong Hwang

Hello,

A singular error is when a node is completely free in 1 or more DOF and is allowed to undergo rigid body movement. In your model file, both the horizontal or vertical elements are pin-pin connected, so the nodes at the connecting of beam and column are free. Change those condition to apply beam end release on the only one of the horizontal or vertical elements.
Thank you.


Best regards,
Jihong Hwang
Creation date: 7/29/2018 11:09 PM      Updated: 7/30/2018 8:39 AM
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