悬索桥建模助手生成模型进行修改后无法收敛，求高手指点

出现如下提示-S T A R T I N G       S O L U T I O N
MULTI-FRONTAL SOLVER
AVAILABLE MEMORY = 1400.0 MBYTES
ENTRY PHASE FOR RENUMBERING
ENTRY NUMBERING_EQN
ENTRY FORM_STIFF_MASS_LOAD
THE INDIVIDUAL ELEMENT STIFFNESS AND LOAD MATRICES WILL NOW BE FORMED.
  ELEMENT NO. :    348  OF     348
ENTRY SOLUTION PHASE
SUSPENSION BRIDGE EQUILIBRIUM STATE ANALYSIS
WARNING : NODE NO.    290  RZ  DOF MAY BE SINGULAR.
WARNING : EQUATION NO.       556
WARNING : NODE NO.     30  DX  DOF MAY BE SINGULAR.
WARNING : EQUATION NO.        83
WARNING : NODE NO.     30  DY  DOF MAY BE SINGULAR.
WARNING : EQUATION NO.        84
WARNING : NODE NO.     30  DZ  DOF MAY BE SINGULAR.
WARNING : EQUATION NO.        85
WARNING : NODE NO.    290  DZ  DOF MAY BE SINGULAR.
WARNING : EQUATION NO.       553
WARNING : NODE NO.    290  DY  DOF MAY BE SINGULAR.
WARNING : EQUATION NO.       552
WARNING : NODE NO.    290  DX  DOF MAY BE SINGULAR.
WARNING : EQUATION NO.       551
WARNING : NODE NO.    160  DZ  DOF MAY BE SINGULAR.
WARNING : EQUATION NO.       276
WARNING : NODE NO.    160  DY  DOF MAY BE SINGULAR.
WARNING : EQUATION NO.       275
NONLINEAR STATIC LOADCASE :     1
INCREMENT NO. :    1  ITERATION NO. :    1     DISPL. NORM : 0.100E+01
  CABLE ELEMENT CONVERGENCE FAILURE       1   CHANGE ELEMENT TYPE CABLE -> TRUSS
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ERRORS ENCOUNTERED.  MIDAS JOB TERMINATED. REFER TO .OUT FILE
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