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A new seismic isolation system and its feasibility study
Gaofeng Jia,Zhifei Shi +1 more
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In this article, a new seismic isolation system called a periodic foundation (PF) where inclusions are periodically arranged is introduced, which is different from traditional base isolation in that it causes a fundamental frequency shift in the structure, thus reducing its response and generating a frequency gap.Abstract:
This paper introduces a new seismic isolation system called a periodic foundation (PF), where inclusions are periodically arranged. The PF is different from traditional base isolation in that it causes a fundamental frequency shift in the structure, thus reducing its response and generating a frequency gap. If the frequency contents of a seismic wave fall into the gap, it can not propagate in the foundation. Thus, it will exert no influence on the structure above. A systematic study of the band of frequency gap for a 2D PF is conducted. The influence of physical and geometrical parameters such as density and elastic modulus as well as filling fraction of the PF and its materials on the band of frequency gap are investigated, and a design with a frequency gap as low as 2.49–3.72 Hz is achieved. This band of frequency gap corresponds well to the design spectra in earthquake engineering. Numerical simulations of a six-story frame structure with different foundations demonstrate that a proposed PF can greatly reduce the seismic response of an isolated structure. This investigation shows that PFs have great potential in future applications of seismic isolation technology.read more
Citations
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Periodic materials-based vibration attenuation in layered foundations: experimental validation
TL;DR: In this article, a new type of layered periodic foundation consisting of concrete and rubber layers is experimentally investigated, and a finite element model is built to show the isolation characteristic of a finite dimensional periodic foundation.
Journal ArticleDOI
Attenuation zones of periodic pile barriers and its application in vibration reduction for plane waves
Jiankun Huang,Zhifei Shi +1 more
TL;DR: In this paper, the attenuation zones of a two-dimensional infinite periodic pile barrier subjected to plane waves are analyzed by plane wave expansion method, and the screening effectiveness of finite periodic pile barriers is simulated by the finite element method.
Journal ArticleDOI
Quasi-two-dimensional optomechanical crystals with a complete phononic bandgap
TL;DR: In this paper, a planar two-dimensional optomechanical crystal formed in a silicon microchip was used to create a structure devoid of phonons in the GHz frequency range, and a nanoscale photonic crystal cavity was placed inside the phononic bandgap crystal in order to probe the properties of localized acoustic modes.
Journal ArticleDOI
Novel composite periodic structures with attenuation zones
Zhibao Cheng,Zhifei Shi +1 more
TL;DR: In this article, the attenuation zones of two-dimensional composite periodic structures consisting of concrete, steel and rubber are investigated, and the reinforcement ratio is considered based on the equivalent principle of composite mechanics.
Journal ArticleDOI
Seismic isolation foundations with effective attenuation zones
TL;DR: In this article, a new configuration of seismic isolation foundation containing several concrete layers and some rubber blocks is proposed, where the concrete layers are placed periodically to form a periodic foundation, and an equivalent analytical model is established.
References
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Introduction to solid state physics
TL;DR: In this paper, the Hartree-Fock Approximation of many-body techniques and the Electron Gas Polarons and Electron-phonon Interaction are discussed.
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Dynamics of Structures: Theory and Applications to Earthquake Engineering
TL;DR: In this paper, the authors present a single-degree-of-freedom (SDF) system, which is composed of a mass-spring-damper system and a non-viscous Damping Free Vibration (NFV) system.
Journal ArticleDOI
Locally Resonant Sonic Materials
TL;DR: In this article, a 2-centimeter slab of this composite material is shown to break the conventional mass-density law of sound transmission by one or more orders of magnitude at 400 hertz.
Book
Design of seismic isolated structures : from theory to practice
Farzad Naeim,James M. Kelly +1 more
TL;DR: Theoretical Basis of Seismic Isolation is discussed in this article, where the authors present a set of specifications for design, manufacturing, and testing of isolation devices.