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标题: STAAD PRO 2006的警告是什么意思,请教.急. [打印本页]

作者: niuchuanquan    时间: 2007-10-18 16:33     标题: STAAD PRO 2006的警告是什么意思,请教.急.

***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.
作者: delta    时间: 2007-10-19 11:43

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模型中8号节点在MY方向失稳
作者: mifen    时间: 2007-10-22 16:50

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




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