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Coupled

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constraints

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and

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restraints

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may

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be

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modeled

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within

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CSI Software, though precaution should be taken to avoid the numerical problems which may result. To successfully model coupling behavior, multiple joints should be connected using a constraint, then sufficiently stiff objects should connect pairs of joints to the assembly of constraints.

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Related Incidents:

  • Incident 23987: Fixed link connected to fixed restraints results in zero reactions in moving load analysis. See 5/29/2010 action.

Question 1:  Is there an example of how constraint coupling may cause numerical instability?

Answer 1: OPEN QUESTION