dynamics analytical

Dear All,

Can you recommend a book, which introduces complex numbers in the context of
structural dynamics? 

It seems that recasting differential equations with unknown acceleration,
velocity and displacement in the complex number format helps to arrive at the
solution. It seems indispensable when dealing with damping.

I am looking for a resource that formulates dynamic equations of motions
using complex numbers, with step-by-step explanations.

Your advice and thoughts will be appreciated.

Thank you,

Stefan