[ETABS] ETABS警告”THE STRUCTURE IS UNSTABLE OR ILL-CONDITIONED!!” (Case 4) (Lost Accuracy)

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小伙伴的ETABS模型,遇到问题,直接计算,报错,提示”THE STRUCTURE IS UNSTABLE OR ILL-CONDITIONED!!”,提示结构不稳定。

最近在测试ETABS,由于太久没用ETABS,总是各种问题,已经是第4次遇到这个问题:

* * * W A R N I N G * * *
THE STRUCTURE IS UNSTABLE OR ILL-CONDITIONED !!
CHECK THE STRUCTURE CAREFULLY FOR:
– INADEQUATE SUPPORT CONDITIONS, OR
– ONE OR MORE INTERNAL MECHANISMS, OR
– ZERO OR NEGATIVE STIFFNESS PROPERTIES, OR
– EXTREMELY LARGE STIFFNESS PROPERTIES, OR
– BUCKLING DUE TO P-DELTA OR GEOMETRIC NONLINEARITY, OR
– A FREQUENCY SHIFT (IF ANY) ONTO A NATURAL FREQUENCY

TO OBTAIN FURTHER INFORMATION:
– USE THE STANDARD SOLVER, OR
– RUN AN EIGEN ANALYSIS USING AUTO FREQUENCY SHIFTING (WITH
ADDITIONAL MASS IF NEEDED) AND INVESTIGATE THE MODE SHAPES

同时提示 Lost Accuracy 丢失精度.

 

后仔细检查,是底部墙肢约束不足导致

 


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[18]. [ETABS] ETABS警告”THE STRUCTURE IS UNSTABLE OR ILL-CONDITIONED!!”

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