Abstract
The combination of a negative stiffness damper and an inerter is a novel system that acts as an energy dissipation device for the structures under seismic loading. In the present study, a damped system with a single degree of freedom (SDOF) and supplementary dampers, including negative stiffness and inerter-based damper, was considered to control the response based on H2 optimum control strategies. Five different configurations were investigated as supplementary dampers that included a tuned mass damper inerter (TMDI), clutching inerter damper (CID), and three configurations of negative stiffness amplifier damper inerter (NSADI). Structural responses under stochastic or random excitations were controlled by using the H2 optimal control strategy based on minimizing the root mean square. The random white noise process was modeled as ground acceleration excitations. Optimum parameters were obtained from closed-form of expressions, and the corresponding equations of motion of the SDOF system with supplementary dampers were expressed in a state space form. Closed-forms of expressions were obtained for TMDI, NSADI, and CID from two-stage processes that consisted of firstly using techniques to search for the minimum of the H2 form and secondly using a numerical search technique of curve fitting at a sequence scheme for arriving at the closed-form of expressions. Two different ground motions (horizontal and vertical ground motion excitations) and two sets of ground motions (near-fault and far-field) for input excitations for base-isolated structures were considered. A parametric study was carried out to optimize TMDI, CID and NSADI parameters, including mass ratio, negative stiffness ratio, positive stiffness ratio, natural frequency and damping ratio, according to the maximum reduction of the response maxima. The H2 optimum technique plays a vital role in the response mitigation of base isolated structures under real seismic excitations. In addition, the base-isolated structure with NSADI and CID performs better compared to other supplementary dampers, considering the response reduction. Consequently, the response of both the negative stiffness damper and the tuned mass damper is boosted by adding an inerter mechanism for controlling the response of structures under seismic load.
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The data for producing the presented results will be made available by request.
Abbreviations
- SDOF:
-
Single degree of freedom
- TMDI:
-
Tuned mass damper inerter
- CID:
-
Clutching inerter damper
- NSADI:
-
Negative stiffness amplifier damper inerter
- NSD:
-
Negative stiffness damper
- TMD:
-
Tuned mass damper
- NF:
-
Near-fault
- FF:
-
Far-field
- TLCD:
-
Tuned liquid column dampers
- TLSD:
-
Tuned liquid sloshing dampers
- MDOF:
-
Multiple degree of freedom
- RMS:
-
Root mean square
- PSDF:
-
Power spectral density function
- DOF:
-
Degree of freedom
- BITMDI:
-
Base isolation with TMDI
- BINSADI-1:
-
Base isolation with NSADI-1
- BINSADI-2:
-
Base isolation with NSADI-2
- BINSADI-3:
-
Base isolation with NSADI-3
- BICID:
-
Base isolation with CID
- PGA:
-
Peak ground acceleration
- FFT:
-
Fast Fourier transform
- BIS:
-
Base isolation system without control device
- \(\alpha\) :
-
Negative stiffness ratio
- \(\mu^{opt}\) :
-
Optimum inertance to mass ratio
- \(T_{b}\) :
-
Base period of isolation
- \(\alpha_{opt}\) :
-
Optimum negative stiffness ratio
- \(\beta\) :
-
Positive stiffness ratio
- \(\beta_{opt}\) :
-
Optimum positive stiffness ratio
- \(\lambda\) :
-
Damper position vector
- \(\mu\) :
-
Inertance to mass ratio
- \(\mu_{opt}\) :
-
Optimum inertance to mass ratio
- \(\xi\) :
-
Inherent damping ratio
- \(\xi_{d}\) :
-
Damper damping ratio
- \(\xi_{d,opt}\) :
-
Optimum damper damping ratio
- \(\gamma\) :
-
Damper damping to inherent damping ratio
- \(\omega\) :
-
Forcing natural frequency
- \(\omega_{n}\) :
-
Natural frequency
- \(\sigma_{x}^{2}\) :
-
Controlled mean square response for displacement
- \(\sigma_{x,0}^{2} {\text{t}}\) :
-
Uncontrolled mean square response for displacement
- \(\tilde{\sigma }_{x}^{2}\) :
-
Normalized mean square response for displacement
- A :
-
State matrix
- B :
-
Input excitation vector
- B i :
-
Ith element of vector B
- b :
-
Inertance
- c :
-
Inherent damping of SDOF system
- c d :
-
Damper damping
- [c]:
-
Damping matrix of fixed base structure
- f d :
-
Damper force
- \(H\left( \omega \right)\) :
-
Displacement transfer function
- H 2 :
-
RMS of impulse response of SDFO system
- H ∞ :
-
Maximum frequency domain response
- k :
-
Inherent stiffness of SDOF system
- k p :
-
Positive stiffness of SDOF system
- k ns :
-
Negative stiffness of damper
- [k]:
-
Stiffness matrix of fixed base structure
- M :
-
Primary mass of SDOF system
- m t :
-
Total mass of all floors including base slab
- [m]:
-
Mass matrix of fixed base structure
- P :
-
Matrix containing element < Bi Bj >
- q :
-
Displacement between terminals 4 and 2 of NSADI-3
- r :
-
Influence coefficient vector
- R 2 :
-
Coefficient of determination
- S o :
-
Constant power spectral density
- x :
-
Displacement of SDOF system
- \(x\) :
-
Relative displacement vector for MDOF system
- \(x_{b}\) :
-
Base displacement
- \(\ddot{x}_{g}\) :
-
Ground acceleration
- \(V\) :
-
Covariance matrix
- \(Y\) :
-
Displacement between terminals 2 and 3 of dampers
- \(z\) :
-
State variable vector
- \(z_{i}\) :
-
Ith element of vector z
- \(\left\langle \cdot \right\rangle\) :
-
Expectation operator
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Acknowledgements
K.K. Kiran acknowledges the support provided by the SJB Institute of Technology, Bangalore, Karnataka, India. Mohammed A. Al-Osta, Shamsad Ahmad, and Ashraf A. Bahraq acknowledge the support provided by the King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia.
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Kiran, K.K., Al-Osta, M.A., Ahmad, S. et al. Optimal Design of Tuned Mass and Negative Stiffness Amplifier Dampers with Inerter by H2 Optimal Control Under Bidirectional Seismic Load. Arab J Sci Eng (2024). https://doi.org/10.1007/s13369-024-08960-4
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DOI: https://doi.org/10.1007/s13369-024-08960-4