ansys模型合并？ 150

我在ansys里建立了几个变截面梁单元的模型，单个模型都可以进行分析计算，并都未出现错误。但是当我把这几个模型合并起来时，却总是出现类似以下的错误，而且不能计算：

Element 55 integration 1 point is located outside of end stations.     
 Please verify section input 1.000000805. 

我合并模型所用的命令为：                                                                       
FINISH                                                                   
/CLEAR                                                                   
/PREP7                                                                   
/INPUT,'A1,'TXT','F:\model\',, 0    
CDWRITE,ALL,'A1,'cdb',,'A1,'iges'                    
                                                                         
FINISH                                                                   
/CLEAR                                                                   
/PREP7                                                                   
/INPUT,'A2,'TXT','F:\model\',, 0    
CDWRITE,ALL,'A2,'cdb',,'A2,'iges'                    
                                                                         
!!合并模型!!!                                       
FINISH                                              
/CLEAR                                              
/PREP7                                              

CDREAD,ALL,'A1,'cdb',,'A1','iges'
CDREAD,ALL,'A2','cdb',,'A2','iges'

/SHRINK,0   
/ESHAPE,1.0 

这个命令流我之前用来合并过别的几个模型（这几个模型没有变截面），并没有出现错误。请问各位这是怎么回事，是不是这个合并模型的命令流不适用于变截面梁？若是这样，各位有什么别的方法合并ansys模型？