two mass spring systems considering impact

[samearthquake]

Hi everyone

I want to model impact of two mass spring systems with masses of m1 and m2 and stiffness k1 and k2. Between of two masses is a gap. Firstly, both m1 and m2 are compressed, such that each one has a initial displacement (disp1 ans disp2 related to m1 and m2 respectively). After compressing masses and releasing them, the impact can be occurred depending to the values of initial displacements and gap. Is there anyone who can help me for modeling the above system and then performing impact analysis?

Thanks so much

[giovannimilan]

http://opensees.berkeley.edu/wiki/index ... t_Material

[samearthquake]

Dear giovannimilan

Thank you very much. Can you give me an example or more explanations?

Thanks so much