EXPERIMENTAL STUDIES OF A NEW STRUCTURAL TUNED MASS DAMPER SYSTEM

Based on the principle of Tuned Mass Damper (TMD), this paper discusses the method of using Laminated Rubber Bearing(LRB) to connect TMD with structure. This is a newtype TMD system with suspended Top Floor to test its function of quake-reduction and its possibility of application, this paper explores the suspended Top Floor through shaking table test.In the model test, an electrohydraulic shaking table was used. The main structure model was a four-floor steel frame structure. The block to combat the structural quake was a concrete block.LRB was used to connect the block to the main structure. In order to analyze the efficiency of TMD, the fundamental frequencies of the main structure and the block of TMD were measured separately. The frequencies of the structure with the block and without the block were compared respectively under sine and imitative quake waves.The test shows that this new type TMD system is effective in combating the structural quake,reducing the acceleration of the top floor by more than 25%. Because of the easy availability of the method, it is endowed with economy and practical feasibility.