Parameter Optimization of the Kdamper Concept in Seismic Isolation of Bridges Using Harmony Search Algorithm

Syrimi, Panagiota; Sapountzakis, E. J.; Tsiatas, George; Antoniadis, Ioannis

doi:10.7712/120117.5408.17764

Cited by 10 publications

(2 citation statements)

References 25 publications

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“…Relevant procedures are described in Antoniadis et al for a force excitation/displacement response transfer function and in previous studies for a base acceleration excitation/relative structure displacement response transfer function. An alternative design approach, incorporating an optimization algorithm, can be found in Syrimi et al. However, the results of the optimization present significant differences, depending on the transfer function to be selected for optimization.…”

Section: Overview Of the Kdamper Conceptmentioning

confidence: 99%

Performance assessment of the KDamper as a seismic Absorption Base

Kapasakalis

Antoniadis

Sapountzakis

2020

Struct Control Health Monit

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Summary The KDamper is a novel passive vibration absorption concept based essentially on the optimal combination of appropriate stiffness elements, one of which has a negative value. In this paper, the implementation of the KDamper as a seismic Absorption Base (KDAB) is considered. The performance of the KDAB is assessed in three characteristic test cases, namely, a rigid body and two flexible buildings with fundamental periods of 0.5 and 1.0 s, respectively. In all three cases, the structures are excited by real and artificial accelerograms. The performance of the KDAB is compared not only with the original structure but also with the cases of conventional and highly damped base isolation systems, as well as with the case of a tuned mass damper inerter. Alternative options for the selection of the KDamper nominal frequency are considered, leading to two cases. In the first one, the nominal KDamper frequency is selected equal to the low frequency of a conventional base isolation system, resulting in a drastic improvement of the overall structural performance (i.e., superstructure accelerations and base drifts). In the second one, the KDAB is implemented with a much higher nominal frequency, leading to a drastic reduction of the relative base displacement, in the order of few centimeters, combined with acceptable structural performance. As a consequence, the KDamper can be implemented as a supplement of a conventional base isolation system or, alternatively, as a “stiff absorption base,” overcoming the disadvantages of seismic isolation approaches, leading towards new seismic protection technologies.

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Section: Overview Of the Kdamper Conceptmentioning

confidence: 99%

Performance assessment of the KDamper as a seismic Absorption Base

Kapasakalis

Antoniadis

Sapountzakis

2020

Struct Control Health Monit

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“…Kapasakalis, Antoniadis, and Sapountzakis 2020;K. Kapasakalis, Antoniadis, and Sapountzakis 2019;Konstantinos A. Kapasakalis, Antoniadis, and Sapountzakis 2022;Syrimi et al 2017). The influence of spatially varying ground motions (SVGMs) was studied by Jiang et al (Jiang et al 2023) to the response of large-spanning bridges equipped with KDampers, revealing that the KDamper effectiveness is more evident when SVGMs are considered, compared to the uniform ground motions, and should be considered when large structures are investigated (Emami and Tayefeh Mohammad Ali 2022).…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Distributed Extended KDamper Devices for Seismic Protection of Mid-Rise Building Structures

Kapasakalis

Mantakas

Kalderon

et al. 2023

Journal of Earthquake Engineering

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This study proposes a novel seismic protection strategy that applies and distributes extended KDamper devices (d-EKD) along the height of an existing mid-rise building structure. The performance of the d-EKD is assessed on a set of real earthquake records and is compared to a system with optimally distributed Tuned Mass Dampers (d-TMD). The proposed framework with the d-EKDs manages to outperform the d-TMDs, regardless the number of installed devices, further reducing the structure's dynamic responses by more than 15%, using 10 times lower total additional masses, rendering it a realistic and compelling alternative for passive seismic protection.

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