One of the researcher of same name of mine, taken authorship of almost all articles which comes under my research. Therefore I am enable to add those articles under my research. Kindly suggest the solution.
This is a frequent problem in ResearchGate in case of similar or identical names, in most cases caused by an automatic algorithm of RG, not by other users. See "Another researcher has claimed my publications" in https://explore.researchgate.net/display/support/Authorship for instructions how to correct this. But unlike this help page suggests, most probably it was not the other author himself who wrongly claimed authorship, but ResearchGate's automatic algorithm wrongly identified him as the author and assigned your publication(s) to his profile.