وارنینگ در آنالیز ایتبس9.7.4

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وارنینگ در موقع آنالیز ایتبس و وقتی تیک پی دلتارو برمیدارم این وارنینگ دیگه نمیاد--مشکلش چیه؟؟
اینم نمونه ای از وارنینگها


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NEGATIVE STIFFNESS FOUND DURING SOLUTION FOR DOF UY OF JOINT 542
LOCATED AT X = 8.333333, Y = .000000, Z = 1.000000,
STIFFNESS MATRIX DIAGONAL VALUE = -163616.325,


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NEGATIVE STIFFNESS FOUND DURING SOLUTION FOR DOF UY OF JOINT 544
LOCATED AT X = 6.666667, Y = .000000, Z = 1.000000,
STIFFNESS MATRIX DIAGONAL VALUE = -150553.418,


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NEGATIVE STIFFNESS FOUND DURING SOLUTION FOR DOF UY OF JOINT 526
LOCATED AT X = 8.333333, Y = .000000, Z = 2.000000,
STIFFNESS MATRIX DIAGONAL VALUE = -125653.270,


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NEGATIVE STIFFNESS FOUND DURING SOLUTION FOR DOF UY OF JOINT 528
LOCATED AT X = 6.666667, Y = .000000, Z = 2.000000,
STIFFNESS MATRIX DIAGONAL VALUE = -117107.190,


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NEGATIVE STIFFNESS FOUND DURING SOLUTION FOR DOF UY OF JOINT 473
LOCATED AT X = 8.333333, Y = .000000, Z = 4.000000,
STIFFNESS MATRIX DIAGONAL VALUE = -146604.652,


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NEGATIVE STIFFNESS FOUND DURING SOLUTION FOR DOF UY OF JOINT 475
LOCATED AT X = 6.666667, Y = .000000, Z = 4.000000,
STIFFNESS MATRIX DIAGONAL VALUE = -132633.343,


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NEGATIVE STIFFNESS FOUND DURING SOLUTION FOR DOF UY OF JOINT 487
LOCATED AT X = 15.000000, Y = 17.000000, Z = 4.000000,
STIFFNESS MATRIX DIAGONAL VALUE = -169432.797,


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NEGATIVE STIFFNESS FOUND DURING SOLUTION FOR DOF UY OF JOINT 485
LOCATED AT X = 17.000000, Y = 17.000000, Z = 4.000000,
STIFFNESS MATRIX DIAGONAL VALUE = -171370.475,


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NEGATIVE STIFFNESS FOUND DURING SOLUTION FOR DOF UY OF JOINT 540
LOCATED AT X = 15.000000, Y = 17.000000, Z = 2.000000,
STIFFNESS MATRIX DIAGONAL VALUE = -185797.803,


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NEGATIVE STIFFNESS FOUND DURING SOLUTION FOR DOF UY OF JOINT 556
LOCATED AT X = 15.000000, Y = 17.000000, Z = 1.000000,
STIFFNESS MATRIX DIAGONAL VALUE = -147063.927,


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NEGATIVE STIFFNESS FOUND DURING SOLUTION FOR DOF UY OF JOINT 538
LOCATED AT X = 17.000000, Y = 17.000000, Z = 2.000000,
STIFFNESS MATRIX DIAGONAL VALUE = -187846.976,


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NEGATIVE STIFFNESS FOUND DURING SOLUTION FOR DOF UY OF JOINT 554
LOCATED AT X = 17.000000, Y = 17.000000, Z = 1.000000,
STIFFNESS MATRIX DIAGONAL VALUE = -152314.291,


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NEGATIVE STIFFNESS FOUND DURING SOLUTION FOR DOF UX OF JOINT 477
LOCATED AT X = 19.000000, Y = 9.666667, Z = 4.000000,
STIFFNESS MATRIX DIAGONAL VALUE = -346654.069,


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NEGATIVE STIFFNESS FOUND DURING SOLUTION FOR DOF UX OF JOINT 479
LOCATED AT X = 19.000000, Y = 7.333333, Z = 4.000000,
STIFFNESS MATRIX DIAGONAL VALUE = -322803.568,


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NEGATIVE STIFFNESS FOUND DURING SOLUTION FOR DOF UX OF JOINT 530
LOCATED AT X = 19.000000, Y = 9.666667, Z = 2.000000,
STIFFNESS MATRIX DIAGONAL VALUE = -385440.167,