KDamper Concept for Base Isolation and Damping of High-Rise Building Structures

Kapasakalis, Konstantinos A.; Antoniadis, Ioannis; Sapountzakis, E. J.

doi:10.1007/978-981-15-8049-9_16

Cited by 9 publications

(14 citation statements)

References 31 publications

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“…According to previous work of KDamper [32][33][34][35][36][37], an additional mass of 5% is efficient. In an effort to make the device more realistic and easier to implement, mD is selected as 0.1% of the structure mass.…”

Section: Optimization Constraints and Limitations Based On Engineering Criteriamentioning

confidence: 99%

“…Proposed by Antoniadis et al [22], the KDamper exploits the advantages of the aforementioned concepts, incorporating appropriate stiffness and mass elements, which include a NS element. The KDamper has been examined for the protection of bridge structures [23][24][25][26][27], Wind Turbines [28,29] and structural systems [30,31]. In addition, the KDamper is effectively implemented as an Absorption Base (KDAB) in the bases of structures [32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

“…The KDamper has been examined for the protection of bridge structures [23][24][25][26][27], Wind Turbines [28,29] and structural systems [30,31]. In addition, the KDamper is effectively implemented as an Absorption Base (KDAB) in the bases of structures [32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

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Feasibility Assessment of Stiff Seismic Base Absorbers

Kapasakalis

Antoniadis

Sapountzakis

2021

J. Vib. Eng. Technol.

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A radically new concept of a Stiff Seismic Base Absorber (SBA) is proposed. An inerter is first implemented, connecting directly the structure to the ground. This results to the decrease of the natural frequency of the structure, without the decrease of the structural stiffness. Parallel, an extension of the KDamper is used, in order to increase the apparent damping behavior of the inerter. A negative stiffness (NS) element connects the additional mass of the SBA to the structure and a positive stiffness element the additional mass to the base. Also, an artificial damper is placed in parallel with each stiffness element. The design of the SBA is based on an appropriate optimization approach, which includes the following novel features: i) the SBA foresees variation in all stiffness elements, ii) the optimal system parameters are selected based on engineering criteria with proper constraints and limitations to the system dynamic responses, iii) the earthquake input motion is selected according to the seismic design codes, iv) a displacementdependent non-linear configuration is proposed for the realization of the NS element, and v) the detuning phenomena are observed via sensitivity analysis. Compared to other vibration absorbers, the SBA presents a number of advantages. An improved superstructure dynamic behavior is observed combined with small base displacements, in the order of a few centimeters. The drastically reduced base displacements render the implementation of the SBA feasible using conventional structural elements. As a result, the SBA is a possible retrofitting option for seismic protection.

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Section: Optimization Constraints and Limitations Based On Engineering Criteriamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Feasibility Assessment of Stiff Seismic Base Absorbers

Kapasakalis

Antoniadis

Sapountzakis

2021

J. Vib. Eng. Technol.

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“…Instead of increasing the additional mass, the vibration isolation capability of the KDamper can be increased by increasing the value of the negative stiffness element, overcoming the sensitivity problems of TMDs as the tuning is mainly controlled by the negative stiffness element's parameters. Thus, the KDamper always indicates better isolation properties than a TMD with the same additional mass, finding numerous applications for vibration absorption of structural systems [24][25][26][27][28][29][30]. Although the KDamper incorporates a negative stiffness element, it is designed to be both statically and dynamically stable.…”

Section: Introductionmentioning

confidence: 99%

Vibration Mitigation of Wind Turbine Towers Using Negative Stiffness Absorbers

Kapasakalis¹,

Antoniadis²,

Sapountzakis³

et al. 2021

J. Civ. Eng. Constr.

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The application of dynamic vibration absorbers (DVA) to Wind Turbine (WT) towers has the potential to significantly improve the damping of the tower and the nacelle dynamic responses, increasing thus the reliability of WTs. The Tuned Mass Damper (TMD) is limited by the requirement of large masses, in association to its installation location. In this study, two alternative concepts are considered. First, the nacelle is released from the WT tower, using a low stiffness connection. This option is based on the seismic isolation concept. Additionally, a novel passive vibration absorption configuration is implemented, based on the KDamper concept. The KDamper is essentially an extension of the TMD, introducing negative stiffness (NS) elements. Instead of increasing the additional mass, the vibration absorption capability of the KDamper can be increased by increasing the value of the NS element. Therefore, the KDamper always indicates better isolation properties than a TMD with the same additional mass. For the nonlinear dynamic response of the WT a build-in house software is developed. The dynamic performance of the proposed vibration mitigation concepts is numerically examined. All methods present superior dynamic behaviour as compared to the uncontrolled structure, however only the KDamper-based designs significantly increase the effective damping of the WT tower, retaining the additional masses in reasonable ranges.

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“…Instead of increasing the additional mass, the vibration isolation capability of the KDamper can be increased by the NS, overcoming the sensitivity problems of TMDs as the tuning is mainly controlled by the NS. Thus, the KDamper always indicates better isolation properties than a TMD with the same mass, finding numerous applications for vibration absorption in structural systems [15][16][17][18][19][20][21][22][23][24]. Although the KDamper incorporates a NS element, it is designed to be statically and dynamically stable.…”

Section: Introductionmentioning

confidence: 99%

Vibration Control of Wind Turbine Towers With Kdamper-Based Designs

Kapasakalis¹,

Antoniadis²,

Sapountzakis³

2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The application of dynamic vibration absorbers (DVA) to Wind Turbine (WT) towers has the potential to significantly improve the damping of the tower and the nacelle dynamic responses, thus increasing the reliability of WTs. The Tuned Mass Damper (TMD) is considered a benchmark for vibration absorption of WT. However, its effectiveness is limited by the requirement of large masses, in association to its installation location. Thus, an alternative concept is introduced, which is based on a novel passive vibration absorption configuration, the extended KDamper concept. The KDamper is essentially an extension of the conventional TMD, introducing appropriate negative stiffness (NS) elements. Instead of increasing the additional mass, the vibration absorption capability of the KDamper can be increased by increasing the value of the NS element. Therefore, the KDamper always indicates better isolation properties than a TMD with the same additional mass. In this paper, the performance of these concepts is examined for increasing the damping of WT towers. A constrained optimization procedure is presented, from which the optimal design parameters are obtained. Although both concepts present a good behavior, the KDamper-based design significantly increases the effective damping of the WT tower, retaining the additional masses in reasonable ranges.

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KDamper Concept for Base Isolation and Damping of High-Rise Building Structures

Cited by 9 publications

References 31 publications

Feasibility Assessment of Stiff Seismic Base Absorbers

Feasibility Assessment of Stiff Seismic Base Absorbers

Vibration Mitigation of Wind Turbine Towers Using Negative Stiffness Absorbers

Vibration Control of Wind Turbine Towers With Kdamper-Based Designs

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