Adaptive Harmony Search for Tuned Liquid Damper Optimization under Seismic Excitation

Ayla Ocak,Sinan Melih Nigdeli,Zong Woo Geem,Sanghun Kim,Gebrail Bekdaş

doi:10.3390/app12052645

Ayla Ocak, Sinan Melih Nigdeli + Show 3 more

Open Access

https://doi.org/10.3390/app12052645

Copy DOI

Abstract

In this study, the tuned liquid damper (TLD) device was optimized by the harmony search (HS) and adaptive harmony search algorithms (AHS). Using the harmony search algorithm, seismic excitations were directed at single and ten-story structures, and TLD parameters were optimized to minimize building movement. To improve design parameters, the optimization process was repeated by adapting the design factors of the harmony search algorithm. For this purpose, both the harmony memory consideration ratio (HMCR) and fret width (FW) were gradually reduced by providing an initial value, and optimum algorithm parameters were obtained. As a result of both optimizations, in a critical seismic analysis, the displacements of the adaptive harmony search showed smaller means and standard deviations than those of the classical harmony search.

Highlights

Passive dampers are the preferred systems for vibration control of structures because of their low cost, ability to be added to existing buildings, and ease of maintenance and repair
The optimization of tuned liquid dampers is important in terms of control performance
When the harmony search algorithm and the optimization results of the adaptive harmony search algorithm, obtained by its adaptation, are examined, it can be determined that the AHS algorithm provides better displacement reduction than the classical HS algorithm

Summary

Introduction

Passive dampers are the preferred systems for vibration control of structures because of their low cost, ability to be added to existing buildings, and ease of maintenance and repair. When evaluated in terms of the characteristic features of the design of TLDs, there are studies in which the use of water, and mixtures including water, as the liquid, has shown good results in terms of performance in various vibration control, easy accessibility, and cost [1,2]. Another feature that affects damping is the geometrical characteristics of the damper tank. Fujino et al (1992) suggested a ratio between this length and the tank height in a study [8] Another parameter that affects TLD performance is mass. The recommended 5% mass ratio for TMDs can be applied to TLDs as well, and it is recommended in the literature that TLD mass should be between 1% and 4% [9–12]

Methods

Findings

Discussion

Conclusion