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THE EFFECT OF SOIL-STRUCTURE INTERACTION (SSI) ON THE PEAK RESPONSES OF THREE-SPAN CONTINUOUS REINFORCED CONCRETE (RC) BRIDGE SEISMICALLY ISOLATED IS INVESTIGATED. ALSO, TUNED MASS DAMPER(S) (TMD/S) IS/ARE INSTALLED TO CONTROL UNDESIRABLE BEARING DISPLACEMENT DUE TO THE SSI EFFECT. THE TMDS ARE PLACED AT THE MID-SPAN OF THE BRIDGE AND EACH TUNED WITH A MODAL FREQUENCY, WHILE CONTROLLING UP TO FIRST FEW MODES AS DESIRABLE. THE SOIL SURROUNDING THE FOUNDATION OF PIER IS MODELED BY FREQUENCY INDEPENDENT COEFFICIENTS. DYNAMIC ANALYSIS IS CARRIED OUT IN TIME DOMAIN USING DIRECT INTEGRATION METHOD. IN ORDER TO SPECIFY THE EFFECTS OF THE SSI, THE RESPONSES OF NON-ISOLATED, ISOLATED, AND CONTROLLED ISOLATED BRIDGE ARE COMPARED. IT IS OBSERVED THAT THE SOIL SURROUNDING THE PIER HAS SIGNIFICANT EFFECTS ON THE BEARING DISPLACEMENT OF THE ISOLATED BRIDGES. IN ADDITION, IT IS OBSERVED THAT THE SEISMIC RESPONSES OF ISOLATED BRIDGE REDUCED SIGNIFICANTLY WITH INSTALLATION OF THE TMDS.
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