Dear all, I have two questions boring me.

- In finite element dynamic analysis. The structrural equivalent stiffness matrix, Ke=K+2/h*C+4/h^2*M, can become sigularity?? I kown that in static analysis the structrural stiffness matrix can be sigularity with Det(K) = 0.

2.In finite element dynamic analysis (note: not in static). If a beam is no any restraints, I can directly analyse it under a force using the Newmark method?? I try this, I think it can be work, am I wrong??

Many thanks.