输电塔线建模问题

摇摇晃晃320

我在建模过程中，使用beam188单元建立铁塔，mpc184单元建立绝缘子，link10单元建立导线，三者连接处都有共用节点，边界条件都设置了，但在施加重力加速度计算时一直算不了，请问连接处需要特殊处理吗？                                以下的节点都是导线上的节点，求大神指点！ *** WARNING ***   SUPPRESSED MESSAGE    CP =    1039.656   TIME= 09:34:51
There is at least 1 small equation solver pivot term (e.g., at the UX   
degree of freedom of node 1) which may indicate a numerically unstable  
model.  Please check your results carefully.                           

*** ERROR ***     SUPPRESSED MESSAGE    CP =    1039.719   TIME= 09:34:51
The value of UX at node 44124 is 9.259705723E+10.  It is greater than   
the current limit of 1000000 (which can be reset on the NCNV command).  
  This generally indicates rigid body motion as a result of an           
unconstrained model.  Verify that your model is properly constrained.   

*** ERROR ***     SUPPRESSED MESSAGE    CP =    1039.719   TIME= 09:34:51
*** MESSAGE CONTINUATION ---- DIAGNOSTIC INFORMATION ***               
Rigid body motion can also occur when net section yielding has         
occurred resulting in large displacements for small increments of load  
or when buckling has occurred.  You can plot the time history curve     
for node 44124 in the UX direction to check for stiffness (slope of     
the curve) approaching zero.                                            

*** WARNING ***   SUPPRESSED MESSAGE    CP =    1057.062   TIME= 09:35:00
There is at least 1 small equation solver pivot term (e.g., at the UX   
degree of freedom of node 1) which may indicate a numerically unstable  
model.  Please check your results carefully.                           

*** ERROR ***     SUPPRESSED MESSAGE    CP =    1057.094   TIME= 09:35:00
The value of UX at node 43480 is 3.374903337E+21.  It is greater than   
the current limit of 1000000 (which can be reset on the NCNV command).  
  This generally indicates rigid body motion as a result of an           
unconstrained model.  Verify that your model is properly constrained.   

*** ERROR ***     SUPPRESSED MESSAGE    CP =    1057.094   TIME= 09:35:00
*** MESSAGE CONTINUATION ---- DIAGNOSTIC INFORMATION ***               


*** WARNING ***   SUPPRESSED MESSAGE    CP =    1057.094   TIME= 09:35:00
The unconverged solution (identified as time 1 substep 999999) is      
output for analysis debug purposes.  Results should not be used for     
any other purpose.