Seismic Isolation of Buildings with a New Type of Periodic Foundations

Xiang, Hang; Shi, Zhifei; Bao, Jiaqi

doi:10.1061/41096(366)284

Cited by 5 publications

(5 citation statements)

References 9 publications

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“…The seismic response of a six-story frame was simulated with an equivalent analytical model to establish a set of simplified formulas for estimating lower bound frequency and width of attenuation zones. The application of periodic materials to mitigate vibrational damage on various structural systems was also demonstrated by Cheng et al (2012), Huang and Shi (2013), Jia and Shi (2010), Xiang et al (2010) and Xiang and Shi (2009). The results obtained by Shi (2013, 2014) suggest that the reinforcing ratio in concrete has little influence on attenuation zones and a finite number of periodic units can significantly reduce the vibrational response of systems supported on the periodic units.…”

Section: Introductionmentioning

confidence: 78%

Application of innovative one-dimensional periodic isolation systems for seismic response reduction of bridges

Jain

Shaik

Laskar

et al. 2019

Advances in Structural Engineering

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This article deals with structural vibration attenuation and control using periodic materials for isolation of structures. An innovative approach to achieve wider low-frequency attenuation zones using a combination of different one-dimensional periodic units has been explored to provide close to a vibration-free environment for civil engineering structures subjected to seismic and other excitations. The wave attenuation regions for the base isolation system made of periodic materials have been derived from the theory of phononic materials and investigated using parametric studies and finite element modelling. The concept of combined periodicity is implemented on bridges to achieve wider attenuation zone and higher response reduction. A novel concept of using a hollow-shell periodic isolation system on bridges has been presented to minimize the effect of seismic waves on these structures. A substantial reduction in the seismic response of a bridge model has been observed over the entire frequency domain with the introduction of the proposed isolation systems. The proposed hollow-shell periodic isolation system reduces the seismic response of structures with efficient material utilization as compared to the typical solid-periodic isolation systems. The proposed isolation systems thus open up new directions for research and potential implementation of periodic materials for seismic response reduction and earthquake-resistant design of structures.

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Section: Introductionmentioning

confidence: 78%

Application of innovative one-dimensional periodic isolation systems for seismic response reduction of bridges

Jain

Shaik

Laskar

et al. 2019

Advances in Structural Engineering

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“…Thus, the displacement vector u(t) in equation ( 10) is given by where, d(ω) is the complex amplitude. Equation ( 16) can be obtained by substituting equation ( 15) into equation (10).…”

Section: Frequency Response Functionmentioning

confidence: 99%

“…If the frequency of elastic wave is within the band gaps, elastic wave and vibration will not be allowed to pass through. Inspired by this, the periodic foundation is a new seismic isolation technology which applies the filtering characteristic of the periodic structure [9][10][11][12][13]. As the periodicity of the actual structure is often limited, it cannot achieve complete filtering, so the frequency band gap is reflected as the attenuation zone.…”

Section: Introductionmentioning

confidence: 99%

Seismic mitigation performance of periodic foundations with inertial amplification mechanism considering superstructure-foundation interaction

Sun¹,

Dai²,

Liu³

et al. 2021

Smart Mater. Struct.

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The periodic foundation is a novel seismic isolation technology which uses the filtering characteristics of periodic structures. In order to solve the shortcomings of the existing attenuation mechanism, and to have a better attenuation effect on the main frequency band of ground motions, a periodic foundation based on the inertial amplification mechanism (IAPF) is proposed. The seismic mitigation performance of IAPF is studied by frequency response analysis. The sensitivity analysis and optimization of the interactive system which is composed of IAPF and superstructure are also carried out. The performance of the IAPF interactive system is compared with that of the interactive system composed of the local resonance periodic foundation and superstructure. The results show that IAPF does not require a large resonator mass to mitigate structural response. In addition, proper additional damping can significantly reduce the resonance peak and has negligible effect on the attenuation depth, which makes up for the shortcoming that the periodic foundation will amplify the response at the resonance peaks outside the attenuation zone to some extent.

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“…The third type is the two-dimensional periodic foundation, where steel cylinders were embedded periodically into concrete matrix. [5] experimented on the feasibility of concrete and rubber layered periodic foundation. A frame on a periodic foundation was fabricated and shake table tests were performed, in which great attenuations were found when the exciting frequencies fell into the frequency band gaps.…”

Section: A Periodic Materials Based Seismic Isolation Systemmentioning

confidence: 99%

Potential of Periodic Foundation as an Efficient Multi-Dimensional Seismic Isolator: Review

Cherian¹,

Varkey²

2017

IJERT

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This paper provides an overview of a novel concept in the field of earthquake engineering. Recent investigations in the field of solid state physics revealed the possibility of manipulating the unique dynamic property of 'frequency band gaps' possessed by phononic crystals or 'periodic structure/materials'. When the frequency of a wave falls within the range of the frequency band gap of a periodic material, the wave, and hence its energy, cannot propagate through the periodic material. So, incorporating periodic structures in foundation and hence termed as, 'periodic foundation' can remarkably reduce the seismic response of superstructure over it. There are a number of variables that can affect the frequency band gaps and their widths of the periodic foundation viz. the density and Young's modulus of materials, filling fraction. Parametric investigations enable the design of efficient and economical periodic foundations. Since the concept of periodic materials dates back to even centuries, there are numerous applications of periodic material in different domains of practical life, which are also reviewed.

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Seismic Isolation of Buildings with a New Type of Periodic Foundations

Cited by 5 publications

References 9 publications

Application of innovative one-dimensional periodic isolation systems for seismic response reduction of bridges

Application of innovative one-dimensional periodic isolation systems for seismic response reduction of bridges

Seismic mitigation performance of periodic foundations with inertial amplification mechanism considering superstructure-foundation interaction

Potential of Periodic Foundation as an Efficient Multi-Dimensional Seismic Isolator: Review

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