Bio-Inspired Passive Optimized Base-Isolation System for Seismic Mitigation of Building Structures

Chen, Xi; Yang, Henry T. Y.; Shan, Jiazeng; Hansma, Paul K.; Shi, Weixing

doi:10.1061/(asce)em.1943-7889.0000971

Cited by 20 publications

(22 citation statements)

References 25 publications

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“…Four earthquake records were utilized in this section, which was previously adopted by Ramallo et al and the authors . Four earthquake records were utilized as excitation sources: El Centro: the north–south (N‐S) component of acceleration of the 1940 Imperial Valley, California earthquake that was recorded at the Imperial Valley Irrigation District substation in El Centro, California. Hachinohe: the N‐S component of acceleration of the 1968 Takochi‐oki (Hachinohe) earthquake that was recorded at Hachinohe City, Japan. Kobe: the N‐S component of acceleration of the 1995 Hyogo‐ken Nanbu (Kobe) earthquake that was recorded at the Kobe Japanese Meteorological Agency, Japan. Northridge: the N‐S component of acceleration of the 1994 Northridge earthquake that was recorded at the Sylmar Olive View FF in Sylmar, California. …”

Section: Numerical Simulation For 2dof Base‐isolated Structurementioning

confidence: 99%

“…Four performance indices of interested, including peak base drift, peak structural acceleration, peak base shear force, and input energy ratio, were chosen to evaluate the performance of different isolation scenarios. The input energy ratio was used to evaluate the efficiency of the isolation system on the energy transfer previously presented by the authors and is defined as follows:

E_{ratio} = \frac{\max E_{ins} ((), t)}{\max E_{in} ((), t)} \times 100 %,

where E in ( t ) is the total input energy, and E ins ( t ) is the input energy that is transmitted to the structure as defined in Equation (A5).…”

Section: Numerical Simulation For 2dof Base‐isolated Structurementioning

confidence: 99%

“…Meanwhile, regarding the features of no energy supply and performance reliability, the conventional passive isolation systems assembled with innovative mechanical characteristics have emerged as an alternative method for developing optimal isolation systems with two principal objectives: (a) effective reduction of superstructure responses and (b) acceptable base displacements in the case of both far‐field and near‐field excitations. Representative isolation techniques include the roll‐in‐cage isolator, the rolling‐ball rubber‐layer isolator, the nonlinear spring for sliding isolation, and the bio‐inspired nonlinear isolation systems recently proposed by the authors …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance improvement of base isolation systems by incorporating eddy current damping and magnetic spring under earthquakes

Shan

Shi

Gong

et al. 2020

Struct Control Health Monit

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Summary An innovative subsystem with the incorporation of eddy current (EC) damping and magnetic negative stiffness spring (MNSS) is proposed to develop feasible strategies for performance improvement of existing base isolation techniques. The concept of integrating the eddy current damping mechanism and the nonlinear negative stiffness spring is firstly introduced for better energy transition behavior under earthquake excitations. The analytical expressions of the force characteristics of the EC and the MNSS components are presented accordingly, and a parametric study is conducted to evaluate the inherent properties of the integrated magnetic subsystem. To demonstrate the advantages of the EC–MNSS subsystem, an illustrative example of a two‐DOF model simulating both the superstructure and the isolation layer is numerically investigated by adopting two representative isolators and the proposed subsystem. The EC–MNSS subsystem is illustrated to significantly and simultaneously improve the isolation performances in terms of base drift and structural acceleration. The energy exchange and dissipation behavior are further revealed by employing time history analysis and energy‐displacement‐velocity plots. Furthermore, the proposed EC–MNSS subsystem is implemented in a benchmark isolation problem adopting an eight‐story frame structure subjected to bidirectional earthquake excitations. The simulation results indicate the superior and the comparable performances of the integrated isolation system as compared to those of the passive and the control‐augmented isolations, respectively.

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Section: Numerical Simulation For 2dof Base‐isolated Structurementioning

confidence: 99%

E_{ratio} = \frac{\max E_{ins} ((), t)}{\max E_{in} ((), t)} \times 100 %,

where E in ( t ) is the total input energy, and E ins ( t ) is the input energy that is transmitted to the structure as defined in Equation (A5).…”

Section: Numerical Simulation For 2dof Base‐isolated Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance improvement of base isolation systems by incorporating eddy current damping and magnetic spring under earthquakes

Shan

Shi

Gong

et al. 2020

Struct Control Health Monit

Self Cite

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“…The present nonlinear isolator combines a traditional linear isolator and an energy dispersion mechanism . The restoring force

f_{BIO} ((),, x_{b}, {\overset{x}{true}}_{b})

can be generally expressed as

f_{BIO} ((),, x_{b}, {\overset{x}{true}}_{b}) = k_{b} x_{b} + c_{b} {\dot{x}}_{b} + BIO ((),, x_{b}, {\overset{x}{true}}_{b}),

BIO ((),, x_{b}, {\overset{x}{true}}_{b}) = \frac{sgn ((), {\overset{x}{true}}_{b}) - sgn ((), x_{b})}{2} f_{\max},

where x b and

{\dot{x}}_{b}

represent the displacement and velocity of the base isolator, respectively, and k b and c b are the stiffness and damping coefficients, respectively. The term

BIO ((),, x_{b}, {\overset{x}{true}}_{b})

denotes the restoring force component with a maximum force f max and the signum function sgn( x ).…”

Section: Theory Of Stochastic Responsementioning

confidence: 99%

“…Recently, biological inspiration from nature has provided guidance for technical developments, especially towards a new generation of structural control technology . The energy dispersion mechanism was first proposed to be simulated in a passive actuator by Yang et al and was adopted for the development of an innovative base isolation system for building structures . A previous study regarding base isolation has shown that a bio‐inspired isolator may outperform conventional bearings and be comparable to the semiactive isolation system, with the observed characteristic of the simultaneous optimization of the novel isolator on both the base drift and structural acceleration.…”

Section: Introductionmentioning

confidence: 99%

Stochastic optimal design of novel nonlinear base isolation system for seismic-excited building structures

Shan

Shi

et al. 2018

Struct Control Health Monit

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A novel nonlinear isolation system is numerically investigated by employing a stochastic response evaluation and experimentally studied with a small-scale preliminary prototype. The stochastic response of isolated building structures is first derived using a nonstationary random process and time-dependent equivalent linearization, regarding the nonlinear restoring force behavior of the proposed isolator. A parametric study is then performed to evaluate the potential influences of earthquake excitations properties and the optimum force ratio of the isolator that adopts the widely used Kanai-Tajimi model. According to the insights from the parametric study, the optimal design for nonlinear isolation is proposed based on a stochastic optimization procedure with the convergence of different performance objectives. The stochastically optimized isolation system is numerically studied by first comparing the present nonlinear isolator and conventional bearings. The present isolator is systematically illustrated to perform advantageously compared with conventional passive isolators in terms of base drift and structural acceleration through a relatively large group of 40 recorded seismic motions. To further investigate the efficiency of the nonlinear isolator, a benchmark building for smart base-isolation is adopted, and a comparison of the results indicates comparable performances between the proposed passive isolator and the classical active isolation system. Furthermore, an original design of the base isolation system simulating an energy dissipation mechanism is presented with favorable force-deformation behavior from experimental testing on small-scale prototypes.

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Earthquake response and isolation effect analysis for separation type three-dimensional isolated structure

Liu

Tian

Lu-shun

et al. 2018

Bull Earthquake Eng

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Bio-Inspired Passive Optimized Base-Isolation System for Seismic Mitigation of Building Structures

Cited by 20 publications

References 25 publications

Performance improvement of base isolation systems by incorporating eddy current damping and magnetic spring under earthquakes

Performance improvement of base isolation systems by incorporating eddy current damping and magnetic spring under earthquakes

Stochastic optimal design of novel nonlinear base isolation system for seismic-excited building structures

Earthquake response and isolation effect analysis for separation type three-dimensional isolated structure

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