***WARNING - INSTABILITY AT JOINT  8  DIRECTION = MY
PROBABLE CAUSE SINGULAR-ADDING WEAK SPRING
K-MATRIX DIAG= 1.8595238E+01 L-MATRIX DIAG= -3.5527137E-15 EQN NO770
***NOTE - VERY WEAK SPRING ADDED FOR STABILITY
**NOTE** STAAD DETECTS INSTABILITIES AS EXCESSIVE LOSS OF SIGNIFICANT

DIGITS DURING DECOMPOSITION. WHEN A DECOMPOSED DIAGONAL IS LESS THAN

THE BUILT-IN REDUCTION FACTOR TIMES THE ORIGINAL STIFFNESS MATRIX

DIAGONAL, STAAD PRINTS A SINGULARITY NOTICE. THE BUILT-IN REDUCTION FACTOR IS 1.000E-09

THE ABOVE CONDITIONS COULD ALSO BE CAUSED BY VERY STIFF OR VERY WEAK ELEMENTS AS WELL AS TRUE SINGULARITIES.

请教高手,上面是什么意思啊.

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模型中8号节点在MY方向失稳

这个意思是和二楼说的相同，兄弟做的模型在节点8的MY方向不稳定
由于不稳定，软件在做矩阵浓缩的时候，会发生k矩阵有特异解
请检查和节点八相连的杆件，是不是不小心加了个点
staad这个软件很麻烦，有了警告后面的报表全部是不正确的