MIDAS悬索桥建模助手及成桥线形问题

  {" X/ t" j, u! Y/ D/ |1 ^$ V用建模助手生成悬索桥模型后，修改单元和边界，进行精确平衡分析，运行中出现吊索有不正常的张力，收敛终止，请问为何会这样，该如何解决呢？

. n+ Q* @: I7 Z修改INCREMENT NO. :    1  ITERATION NO. :    1     DISPL. NORM : 0.100E+01  TOTAL ITERATION :   108INCREMENT NO. :    1  ITERATION NO. :    2     DISPL. NORM : 0.248E+00  TOTAL ITERATION :   109
/ d" d! ~: F! l& ?$ `" PINCREMENT NO. :    1  ITERATION NO. :    3     DISPL. NORM : 0.973E-01  TOTAL ITERATION :   110
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INCREMENT NO. :    1  ITERATION NO. :    5     DISPL. NORM : 0.207E-01  TOTAL ITERATION :   112
# D6 ~! Y! o3 B& HINCREMENT NO. :    1  ITERATION NO. :    6     DISPL. NORM : 0.101E-01  TOTAL ITERATION :   113
% \0 M% w2 z  D2 ?# @( ~INCREMENT NO. :    1  ITERATION NO. :    7     DISPL. NORM : 0.498E-02  TOTAL ITERATION :   114
8 o( s9 o- ~* f- Z4 a# o- kINCREMENT NO. :    1  ITERATION NO. :    8     DISPL. NORM : 0.247E-02  TOTAL ITERATION :   115
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INCREMENT NO. :    1  ITERATION NO. :   10     DISPL. NORM : 0.611E-03  TOTAL ITERATION :   117

. {0 Y: l. w+ H/ M% A8 x  CABLE ELEMENT NO :     107  HAS IMPROPER TENSION.
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5 M& q5 M7 ?( G5 p5 yERRORS ENCOUNTERED.  MIDAS JOB TERMINATED. REFER TO .OUT FILE
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3 t0 y; p/ u) ]9 c而这根不正常张力的吊索有时是最中间的吊索，改变单元或是荷载后则会变成最边缘第二根吊索，这究竟是怎么回事呢？
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