Influence of seismic excitation frequency content on the efficiency of a combined tuned damping
DOI:
https://doi.org/10.21703/0718-2813.2023.34.2445Keywords:
CTD, TMD, TLCD, optimization, stochastic analysis, seismic protection.Abstract
In this investigation the behaviour of a linear structure of one degree of freedom is analysed, which is controlled by a tuned combined damper (ACS). This consists of two devices, a tuned mass damper (AMS) and a tuned liquid column damper (ACLS). The ACS is subjected to a stochastic seismic excitation in order to analyse the influence of the frequency content on the efficiency of the device. As a measure of efficiency, the percentage of reduction of the displacement standard deviation of the main system is considered. The optimized parameters of each device are the frequency and damping in the case of the AMS, as well as the frequency and pressure drop coefficient for the ACLS. A sensitivity analysis of the optimal parameters of the ACS is carried out, with respect to the mass ratio, period of the main structure and frequency content of the excitation. The main conclusions obtained are that the efficiency of the ACS DHW depends on the frequency content of the excitation. Furthermore, it increases as the mass ratio increases, independent of the frequency content of the excitation. On the other hand, ACS is less efficient for more flexible structures.
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