"lin" <linrunsong@sina.com> wrote:
>
>Error Message "**ERROR- ZERO ON DIAGONAL IN JACOBI ITERATION."I
>try
>adding 10 more modes to the cutoff modes and entering
>set solution incore
>
>command before any loads But no effect.how should I do?
>
>
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This message occurs either (1) when the first frequency is near zero, which indicates that some or all of the structure is unsupported in 1 or more directions; or (2) when STAAD's choice of starting vectors is insufficient.
If (1) above occurs, then solve a static case with selfweight y -1 selfweight x -0.3 selfweight z -0.3 If there are instabilities corrected, then the structure is not adequately supported (or inadequately connected) to solve dynamically. Correct the supports.
If (2) occurs, then enter a SET SSVECT command before the joint coordinates. Occasionally adding 10 more modes will also have the same positive effect on getting the Subspace iteration to avoid failure in the Jacobi step of the iteration.
For small problems the SET SOLUTION INCORE command may be used as a third option.
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