Year: 2011
Type: conference-paper
Abstract: The present paper concerns the optimal tuning of the free parameters of passive Tuned Mass Damper (TMD) devices, added to benchmark frame structures taken from the literature and subjected to a given deterministic seismic excitation.The tuning procedure is achieved through a numerical optimization approach, namely a Minimax algorithm implemented in a MATLAB environment.Different objective functions have been considered, from both kinematic and energy response indicators of the primary structure.The optimization process is carried-out in time domain, whereby the dynamic response is evaluated numerically by a step-by-step integration based on Newmark's average acceleration method.In order to assess the efficiency of the proposed methodology and investigate the effectiveness of the so-conceived TMD, several numerical tests on both single-and multi-degree-of-freedom frame structures endowed with a TMD are performed.The salient numerical results are presented in plots and tables.Plots of the optimal TMD parameters (frequency ratio and damping ratio) as a function of mass ratio are reported and graphs showing the seismic response reduction in terms of top-floor displacement are provided.Tables gathering the optimal TMD parameters and the seismic response reduction at assumed given values of the mass ratio are outlined.Comparisons to results obtained from well-known tuning formulas are provided.The achieved output demonstrates the reliability of the proposed method and shows that, in principle, the design of an optimal TMD device for a specific seismic event is possible.This should have important implications in the framework of adaptive, semi-active and active TMD devices.
Source: Aisberg (University of Bergamo)
Authors: Jonathan Salvi, Egidio Rizzi
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2113680948