最近要写论文，用的是midas/GTS软件，在计算边坡的动力时程分析时，老遇到这个问题，
还请论坛上的大侠们指点下，怎么解决这个问题..小弟不甚感激...谢谢！
> WARNING : NODE NO. 1169 DX DOF MAY BE SINGULAR.
> WARNING : EQUATION NO. 3505
> WARNING : NODE NO. 690 DX DOF MAY BE SINGULAR.
> WARNING : EQUATION NO. 2068
> WARNING : NODE NO. 690 DY DOF MAY BE SINGULAR.
> WARNING : EQUATION NO. 2069
> WARNING : NODE NO. 690 DZ DOF MAY BE SINGULAR.
> WARNING : EQUATION NO. 2070
> WARNING : NODE NO. 736 DZ DOF MAY BE SINGULAR.
> WARNING : EQUATION NO. 2208
> WARNING : NODE NO. 736 DY DOF MAY BE SINGULAR.
> MULTI-FRONTAL SOLUTION HAS BEEN COMPLETED.
>
>
> WARNING : SINGULARITY WAS FOUND IN REDUCED MASS MATRIX
