Seismic Response Control Performance Evaluation of Tuned Mass Dampers for a Retractable-Roof Spatial Structure

Choosing the installation location of a tuned mass damper (TMD) is the most important factor to consider when controlling dynamic response of a structure. It is also necessary to study whether the mass of the TMD installed on the structure effectively reduces the seismic response to the dynamic load. This study investigates the control performance of a seismic load was using a TMD installed on the spatial structure of a retractable roof. The optimum mass ratio and installation location of the TMD were analyzed. The mass of one TMD was set as 1% of the total mass of the analytical model. One TMD mass was fixed, and the optimal position was examined by changing the number of TMDs installed. The displacement response ratio of the model with the TMD was compared to that of a base model without the TMD. The numerical analysis results showed that the displacement responses of the example structure with 8 TMDs were reduced by about 90% compared to the uncontrolled case. The TMDs were most effective when they were installed at the edge rather than concentrated at the center of the spatial structure. After selecting three analytical models that were most effective, we tried to reduce the mass ratio of one TMD to find the optimal one. Using the optimum mass ratio, the TMD mass ratios differed according to the truss position. The analysis results could be used as a reference in TMD design for large space structures.