KB 000982 | Unstable Model

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Description

The most common cause of unstable models are failing member nonlinearities such as tension members.
As the simplest example, there is a frame with supports on the column footing and moment hinges on the column head. This unstable system is stabilized by a cross bracing of tension members. In the case of load combinations with horizontal loads, the system remains stable. However, if it is loaded vertically, both tension members fail and the system becomes unstable, which causes a calculation error.
You can avoid this by activating the special treatment of failing members under "Calculation" - "Calculation Parameters" - "Global Calculation Parameters".d.

Keywords

Dlubal Knowledge Base 30009 calculation error Unstable Instability Dlubal KB Knowledge Base Technical Contribution

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  • Updated 05/10/2021

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