عنوان مجله
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Journal of Vibrational Engineering and Technologies
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چکیده
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Purpose The efficiency and robustness of tuned mass dampers (TMDs) are the two main criteria in the optimum design and
evaluation of their seismic performance. In this study, a framework is presented for optimum seismic design and assessment
of TMD performance in frequency and time domains based on efficiency and robustness.
Material and methods Two 10- and 20-story linear shear buildings have been studied, which represent mid- and high-rise
buildings, respectively, with two inherent damping ratios (2% and 5%) to evaluate the performance of TMDs in this frame-
work. The TMD design has also been investigated for seven different mass ratios. The Particle Swarm Optimization method
has been used to determine the optimal parameters of each damper, and the objective function is considered as minimizing the
largest singular value of the inter-story drift transfer function to ensure the seismic performance and robustness of the TMD.
In addition, three sets of seven earthquake records have been applied with different characteristics to evaluate the robust-
ness of the TMD regarding the stochastic nature of the earthquake. Finally, to explicitly assess the robustness of optimally
designed TMD with other uncertainties in the dynamic properties of the building and TMD, two sensitivity analyses have
been performed in the frequency and time domain to achieve an unbiased seismic evaluation of optimally designed TMDs.
Conclusion The results show the good performance of the damper with optimum parameters but its high sensitivity to the
uncertainty of frequency ratio, especially in the time domain, can significantly reduce the seismic performance of the damper.
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