Seismic performance improvement using bolt-on isolators on interconnected slender electrical equipment

Liu, Zhenlin; Zhang, Lingxin; Cheng, Yong; Lü, Zhicheng; Zhu, Zhubing

doi:10.1016/j.engstruct.2023.116238

Cited by 3 publications

(2 citation statements)

References 30 publications

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“…The isolation design in this study introduces a rocking mechanism at the base that allows the structure to undergo rocking motions under horizontal seismic excitation, as depicted in Figure 3. Unlike setting a hinge at the base in which the supporting block functions as a part of the base hinge [29], the rocking pads are set to provide an adjustable contact surface of width W (the diameter of the contact circle). Reducing the width W tends to make the structure more conducive to uplift, while increasing W enables the structure to enter a rocking state under larger base excitation.…”

Section: Conceptual Developmentmentioning

confidence: 99%

“…In relevant studies, the base of pole-type equipment is engineered to be a rotational hinge in order to achieve isolation objectives [26,27]. Additionally, energy dissipation devices, such as metallic yielding dampers [28,29] or wire rope isolators [30][31][32], are integrated as restraints to control the rotation at the base hinge. This method, which mitigates base moments and prolongs the structural vibration period, has demonstrated effectiveness in enhancing seismic resistance.…”

Section: Introductionmentioning

confidence: 99%

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Seismic Isolation of Fragile Pole-Type Structures by Rocking with Base Restraints

Li,

Hu,

et al. 2024

Buildings

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Pole-type structures are vulnerable to earthquake events due to their slender shapes, particularly porcelain cylindrical equipment in electrical substations, which has inherent fragility and low strength in its materials. Traditional base isolation designs configure the bottom of the pole-type equipment as hinges with restraints. It fully relies on the restrainers to re-center the pole-type equipment, posing a risk of tilting and functionality failure after earthquakes. This study proposes a solution to this challenge by introducing a restrained rocking mechanism at the base of the structure. The design leverages the self-centering nature of rocking motion and uses restrainers to control the amplitude of rotation. Hence, it can effectively avoid tilting of the pole-type structures after earthquakes. Experimental investigations conducted on a 1:1 full-scale specimen revealed that the proposed restrained rocking design can achieve a reduction in seismic internal forces of over 50% while maintaining equipment in an upright position. Furthermore, an analytical model for the proposed isolation system of pole structures was developed and validated through comparison with experimental results. This paper introduces a novel solution for seismic isolation of pole-type structures through restrained rocking, specifically addressing the research gap regarding a reliable self-centering mechanism under seismic excitation. This advancement significantly enhances the seismic resilience of fragile pole-type structures and provides practical design methodologies for the seismic isolation of slender structures.

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Section: Conceptual Developmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seismic Isolation of Fragile Pole-Type Structures by Rocking with Base Restraints

Li,

Hu,

et al. 2024

Buildings

Self Cite

View full text Add to dashboard Cite

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A comprehensive review of resilience of urban metro systems: A perspective from earthquake engineering

Hu,

Wen,

Zhai

et al. 2024

Tunnelling and Underground Space Technology

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Response and Reliability of Composite Post Insulators Under Random Earthquake

Wang,

Cheng,

et al. 2024

J. Phys.: Conf. Ser.

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This article examines the stochastic response and seismic reliability of composite post-insulators under random seismic excitation. A random seismic motion model, tailored for power facility seismic research in China and compliant with the “Seismic Design Specification for Power Facilities” (GB50260-2013), is developed. This model accounts for both amplitude and frequency non-stationary. A nonlinear dynamic model for composite post insulators is then established, incorporating the nonlinearity at the multi-section insulator and flange connections. Numerical methods are employed for random seismic response analysis to address the non-stationary nature of seismic motion. The proposed model’s validity is confirmed by comparing it with the vibration table test results. Finally, the seismic reliability of composite post insulators, with root stress as the control criterion, is assessed using the probability density evolution method.

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Seismic performance improvement using bolt-on isolators on interconnected slender electrical equipment

Cited by 3 publications

References 30 publications

Seismic Isolation of Fragile Pole-Type Structures by Rocking with Base Restraints

Seismic Isolation of Fragile Pole-Type Structures by Rocking with Base Restraints

A comprehensive review of resilience of urban metro systems: A perspective from earthquake engineering

Response and Reliability of Composite Post Insulators Under Random Earthquake

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