求教一个warning，帮帮忙啊
做非线性分析，单元数量较多，f06文件中出现不少相同警告，某些节点刚度非正定说明什么问题啊，我找到了这些节点没发现有什么不对劲的地方啊。*** USER WARNING MESSAGE 4698 (DCMPD)
STATISTICS FOR DECOMPOSITION OF MATRIX KLLRH .
THE FOLLOWING DEGREES OF FREEDOM HAVE FACTOR DIAGONAL RATIOS GREATER THAN
1.00000E+07 OR HAVE NEGATIVE TERMS ON THE FACTOR DIAGONAL.
USER INFORMATION:
THIS MESSAGE MAY BE IGNORED IF NO GRID POINT IDS OR HIGH RATIO MESSAGES APPEAR IN THE TABLE ON THE NEXT PAGE.
1 MSC.NASTRAN JOB CREATED ON 23-FEB-09 AT 16:03:45 APRIL12, 2009MSC.NASTRAN9/23/04 PAGE 7
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GRID POINT ID DEGREE OF FREEDOM MATRIX/FACTOR DIAGONAL RATIO MATRIX DIAGONAL
228 T3 -8.13190E+02 7.14999E+06
266 R1 -5.26420E+00 2.01110E-02
1654 R2 -5.07399E+00 3.03653E-02
^^^ USER INFORMATION MESSAGE 9004 (NLSTATIC)
^^^ FOR THIS ITERATION, THE DIFFERENTIAL STIFFNESS WILL BEIGNORED TO AVOID DECOMPOSITION OF A NON-POSITIVE
DEFINITE STIFFNESS MATRIX.
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