Vibration Mitigationviapassive Translational Tuned Mass Damper
This study investigates the effectiveness of a newly developed passive translational tuned mass damper (PTTMD) to suppress the undesirable response of structures due to external excitations such as earthquakes.In vibration mitigation, tuned mass dampers (TMDs) are an effective and efficient solution which consists of a mass, spring, and dashpot. Typically, the design of TMD for mitigating is depending on theparticular mode of structural vibration (e.g. first mode). For implementing TMD, it is the fundamental concern to find out optimum parameter of TMD to minimize the structural vibration. Therefore, the main focus of this study is to establish optimum parameter (i.e. modal mass) for newly developed PTTMD. To this aim,atwo-storey three-dimensional symmetrical momentresistance steel frame (MRSF) were made. The PTTMD was placed on top of the steel frame and shake-table tests(i.e. dynamic tests) have executed by employing scaled El Centro 1940 earthquake. In order to verify the experimental results and to a deeper analysis of the results, a numerical response prediction model was developed in SAP2000 and the numerical simulation was done using time history analysis with and without PTTMD.The experimental and numerical predicted results showed that the response of the structure could be significantly reduced by using PTTMD. From this study, it has been found that the modal mass of 12.5% and 5% arethe best performer in terms of vibration mitigation for scaled El Centro of 20 sec and 25 sec, respectively.
Index terms - Passive translational tuned mass damper, Vibration mitigation, Momentresistance steel frame, Shake-table, Earthquake, Displacement.