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NUMERICAL PROBLEMS ENCOUNTERED DURING EQUATION SOLUTION - ETABS

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sriharsha.g

Structural
Aug 29, 2024
4
Hi,
I am running a linear modal analysis for my 6 storey steel structure, I am getting the error as "Numerical problems encountered during equation solution" with the following table
* * * W A R N I N G * * *
NUMERICAL PROBLEMS ENCOUNTERED DURING EQUATION SOLUTION:

TYPE LABEL DOF X-COORD Y-COORD Z-COORD PROBLEM VALUE
----- ------- -- ----------- ----------- ----------- ------------- -----------
Cnstr 1 R3 14900.000 10588.988 21450.000 Lost accuracy 7.6 digits


I am unable to locate it in the model. When I move to the particular coordinate, its an empty space. It is a constraint error and i feel that it is related to end releases or hinges. Kindly check once and help me in solving this. I am attaching the model for your reference.


Thank you
 
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It looks to me like the problem is with the Push X Load Case. I switched the solution from Event to Event to Iterative Event to Event and it solved.

You're right that the error message is associated with an internally created diaphragm joint. Not sure why, but I know it goes away when using the iterative event to event solution scheme.
 
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