Dynamic Response Changes of Seismic Isolated Building Due to Material Degradation of HDRB

Gheryani, Muna H.; Razak, Hashim Abdul; Jameel, Mohammed

doi:10.1007/s13369-015-1794-7

Cited by 10 publications

(4 citation statements)

References 24 publications

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“…The laminated rubber bearing offers a benefit to practical applications owing to its standardized modes, whereas the technical challenge of the associated degradation still gets some existing works attention . FSBs have the advantage of being insensitive to seismic ground motions.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of base-isolated structures with sliding hydromagnetic bearings

Peng

Ding

Chen

2018

Struct Control Health Monit

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Being an efficient technique for mitigating the seismic response of structures, base isolation is widely used in earthquake engineering practice. The sliding hydromagnetic bearing is viewed as a promising isolation system for seismic protection, owing to its adaptive damping energy dissipation, mild deformation constraint, and easy assembly and maintenance. To verify the applicability and efficiency of sliding hydromagnetic bearings, a performance evaluation of base-isolated structures with a sliding hydromagnetic baseisolation system is carried out in this paper. Numerical simulations are performed to explore the dynamic behaviors of sliding hydromagnetic bearings fabricated recently, for which two models, the power function and polynomial models, are proposed. Parameter identification and model validation are carried out using the data from numerical simulations and quasi-static tests. Backward differential formulas are employed to solve the stiff differential equation invoked by the Coulomb friction associated with the models, which bypasses the computational challenges inherent in conventional integral schemes. For a real-time definition of the instantaneous frequency in the models, the Hilbert-Huang transform is utilized. Comparative studies reveal that the sliding hydromagnetic bearing has an advantage over the lead rubber bearing and the curved surface slider in the control of structural displacement, structural velocity, and structural acceleration. Furthermore, the residual displacement yielded in the sliding hydromagnetic base-isolation system merely shifts the starting position of the bearing on the next movement, and the sliding surface and deformation constraints remain approximately as the initial condition. KEYWORDS backward differential formulas, base isolation, curved surface slider, Hilbert-Huang transform, lead rubber bearing, sliding hydromagnetic bearing | INTRODUCTIONStructural control has proven its value in the response mitigation and performance enhancement of engineering structures. 1-4 By setting a device and a component or applying an external energy and a substructure into a certain position of the structure, the dynamic behaviors of the structure are changed or adjusted, allowing a reduction of the

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Section: Introductionmentioning

confidence: 99%

Performance evaluation of base-isolated structures with sliding hydromagnetic bearings

Peng

Ding

Chen

2018

Struct Control Health Monit

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“…Concerns about durability have been identified by several researchers in recent years (Pan et al 2005, Hamaguchi et al 2009, Van Engelen and Kelly 2015, Mazza 2019. Various researchers have also addressed the subject of changes to mechanical properties of BI impacting performance (Gheryani et al 2015), and tests have shown that base isolators do not perform as designed for 2 months after an earthquake owing to cyclic straining history on the rubber, and draws attention to the implications for pre-earthquake and aftershock events (Siringoringo and Fujino 2015). There is generally a lack of rigorous and independent research around the subject of base isolator durability, inspection, and replacement.…”

Section: Discussionmentioning

confidence: 99%

Baseisolation: Mindthegap

Coulson¹,

Scheepbouwer²,

Walt³

2022

Proceedings of International Structural Engineering and Construction

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Base Isolation is used in seismically active countries around the world to successfully minimize damage caused by large earthquakes, safeguarding both people and property. Yet, while the technology is understood by earthquake engineers, base-isolated buildings are designed by multi-disciplinary teams, and owned, operated, and maintained by stakeholders who are not typically trained in earthquake engineering. This research examines the use of BI in buildings from a whole of life perspective, specifically investigating the consequences of having a differing design life between the building and base isolator components. The research studies the historic performance of base isolated buildings, the rules that govern base isolation design in New Zealand, and the risks arising in building performance for the whole life of the building. Through an integrative literature review of academic research, engineering guidance notes, building legislation and base isolator manufacturer literature, the research highlighted key risks, the most concerning being a lack of rigorous and independent assessment of base isolator durability, conditions under which base isolators need to be replaced, limited research into the multi-disciplinary design implications of base isolator inspection and replacement, and a gap in literature around the asset management of base isolated buildings generally.

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“…[20][21][22] Finally, the response of the FSBs shifts between the sticking and sliding phases, at the breakaway and motion reversals, highlighting a static friction coefficient greater than the dynamic one. 23 A few studies on the effects of ageing on isolation systems 24-26 after 20, 30, and 40 years of use have been carried out, as well as recent numerical investigations [27][28][29] introducing modification factors accounting for ageing and air temperature effects. The aim of the present work is to investigate the effects of variability of the mechanical properties of elastomeric and sliding bearings, both during the design life and seismic motion, on the nonlinear dynamic response of base-isolated reinforced concrete (r.c.)…”

Section: Introductionmentioning

confidence: 99%

Effects of the long-term behaviour of isolation devices on the seismic response of base-isolated buildings

Mazza

2019

Struct Control Health Monit

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Summary Seismic isolation is widely used around the world for the protection of buildings, but its long‐term behaviour was not considered in detail in past seismic design of isolated structures. Nevertheless, the American seismic code has recently introduced an explicit procedure aimed at evaluating upper‐bound and lower‐bound values of isolation system properties. Yet there are few studies on the evolution and extent of the deterioration of elastomeric (e.g., high‐damping rubber bearings) and sliding (e.g., flat sliding bearings) isolators during their lifetime and on their impact on the seismic behaviour of the superstructure. To investigate this problem, six‐storey–reinforced concrete buildings, base isolated with high‐damping rubber bearings acting alone or in combination with flat sliding bearings, are designed without considering the variability of mechanical properties of the isolation system due to ageing and air temperature. Then, based on experimental results from accelerated ageing tests at high temperature, mathematical models are implemented to account for oxidation of elastomers and friction changes. The variability of mechanical properties at different mean temperatures, due to seasonal thermal variations, is also considered. Finally, fragility curves are developed for the base‐isolation system and superstructure on the basis of nonlinear dynamic analysis of the degraded test structures.

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Dynamic Response Changes of Seismic Isolated Building Due to Material Degradation of HDRB

Cited by 10 publications

References 24 publications

Performance evaluation of base-isolated structures with sliding hydromagnetic bearings

Performance evaluation of base-isolated structures with sliding hydromagnetic bearings

Baseisolation: Mindthegap

Effects of the long-term behaviour of isolation devices on the seismic response of base-isolated buildings

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