Apassive contro 監system With a stud 。 type viscoelastic damper has attr自 cted a strong interest due to its advantage of preserving great freedem in architectural planning , Dynamic characteristics and time − history responses are discussed both experimentally and analytically fbr fbur different stud −type systcms . Simplif玉 ed static methods to estimate stif血 ess and damping as well as member fc ) rces of the systems are proposed . The static methods derive exact solutions , and agree well With

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... the dynamic experiments . The methods are also fbund applicable to a variety of other different systems having dampers of linear viscesity .