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ofcourse expansion joint means 2 different buildings with 2 different behaviour...nothing connecting between 2 except foundation (raft).... model them separately....model the foundation together in SAFE...but you have to export/import properly...and renumber all the points in SAFE for one of the 2 models...(I did it for 4 buildings..just think how many points were threre ) but anyway i was asked to do this sophisticated stuff...but i would recommend you not go for the extreme modelling and keep things simple... model each part separately in ETABS and then export to SAFE separately ... foundations for columns or walls coming on expansion joints can be analyzed by other techniques...by engineering judgement or by doing only 1 set of col/wall foundation on expansion joint and replicating it...

how does w/c ratio effect the micro structure of concrete?

when there is an expansion joint provided in building, do we have to model both parts of building separately??? or we have to make a single model for both parts , ?? and second do we have to terminate our beams when there is a expansion joint, if we are making a single model for both parts of building....???

See table 1 of ACI in first chapter..it depends upon the seismic category...