Baburao,

For your second question:

Springs will be in series or parallel will depend upon whether they have one/more than one point of fixity. The individual elements at the points of intersection ( nodes) are not having the same point of fixity, so they are in parallel. The program which does a matrix addition to compute the global stiffness matrix from the elemental one,does not follow the series/parallel concept,but the physical aspect of the problem is automatically taken care of by the rule of matrix addition.

Hope this answers your question.

Regards

Anindya Bhattacharya