An Experimental Study on MTMD to Improve Structural Performance under Dynamic Loading

Abstract eng:
Studies confirmed that using optimum parameters (mass ratio, damping ratio, and frequency range), MTMD can improve structural performance under dynamic loading. This study aimed to better understand the behavior of structural system with MTMD experimentally, and verify numerical approaches. Two scaled models were used in the experimental study, a SDOF and a 3-DOF system. The models represent regular structures with dominant first mode. MTMD were then attached to the main structures, with the total mass ratio of approximately ten percent of the story mass. Three different numbers of TMD were used, i.e. 1TMD, 3TMD, and 5TMD. For MDOF structure, the locations and distributions of MTMD were also varied from. The models without any TMD were used as a benchmark model to evaluate the effectiveness of MTMD. Prior to experimental studies, identification procedures were carried out to each structural model and dampers to determine the dynamic properties. The experimental study was conducted using shake table with harmonic motions. The responses were recorded using accelerometers and LVDT. The results show that MTMD can reduce the maximum displacement of structures under harmonic motions, thus confirming numerical results. Having MTMD instead of TMD also increased the robustness of the systems, demonstrated by the reduction of structural responses for various input motions. It should be noted that for most cases, using all MTMD located on the top story produced best results compared to other placements or distributions.

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