Experimental Study on Heat-Mechanics Interaction Behavior of Laminated Rubber Bearings

Takenaka, Yasuo; Kondo, Akihiro; Takaoka, Eiji; Hiejta, Makiko; Kitamura, Haruyuki; Nakamura, Takahito

doi:10.3130/aijs.74.2245

Cited by 11 publications

(2 citation statements)

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“…Several studies developed models of seismic isolator behavior that can account for the deterioration of the isolator strength and stiffness due to repeated cycling as a result of hysteretic heating and other effects. 7,[17][18][19][20][21][22][23][24][25] Although these models are presumed useful for the study of the effects of long-duration motion on the response of seismically isolated structures and they have been available for some time, there are no studies that utilize these models and employ statistically healthy 26 large number of ground motions with a large range of motion duration to examine the seismic response of seismically isolated structures. The study reported in this paper attempts to do that by providing information on the effects of ground motion duration on response parameters that are relevant to (a) the design of seismically isolated buildings and (b) the testing of seismic isolators.…”

Section: Introductionmentioning

confidence: 99%

Implications of strong earthquake ground motion duration on the response and testing of seismic isolation systems

Kitayama

Constantinou

2020

Earthq Engng Struct Dyn

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This paper presents an investigation of the effects of the duration of earthquake ground motion on the peak displacement and total dissipated cumulative energy in seismic isolation systems designed by the procedures of ASCE/SEI 7-16. The seismic isolation systems considered in this study are elastomeric with lead and natural rubber bearings and sliding in the form of single and triple friction pendulum bearings. Long-and short-duration ground motions were selected so that the 5%-damped spectral acceleration values of each motion were closely matched over periods of 0.05 to 6 s. The results of the analysis demonstrate that the duration of ground motions have insignificant effects on the isolation system peak displacement-particularly in the lower bound conditions and sliding isolation bearings-but have important effects on the total cumulative energy for all conditions. This has implications in the testing of isolators, which are presented in an evaluation of the isolator test procedures of the ASCE/SEI 7-16 standard. The evaluation reveals that, if the cumulative energy dissipated by the isolation system is used as the controlling criterion, the specified tests are generally appropriate for locations characterized by short-duration ground motions, but are unconservative for locations where long-duration motions are anticipated. Additional results and discussion demonstrate that the cumulative energy may not be an appropriate criterion for designing isolator tests as it may lead to unrealistic demands on the tested isolators.

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Section: Introductionmentioning

confidence: 99%

Implications of strong earthquake ground motion duration on the response and testing of seismic isolation systems

Kitayama

Constantinou

2020

Earthq Engng Struct Dyn

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“…conducted coupled heat and structural analyses and compared the results with their test results. Takenaka et al 32 . reported an experimental study on coupled heat and mechanical behavior of laminated HDRBs.…”

Section: Introductionmentioning

confidence: 99%

Coupled structural and heat conduction FE analysis of laminated high damping rubber bearing

Miyamura

Ohsaki

Fujiwara

et al. 2021

Earthq Engng Struct Dyn

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A framework for coupled structural and heat conduction finite element analysis is developed for laminated high damping rubber bearings (HDRBs), and coupled analyses are conducted for full‐scale tests of an HDRB using the shaking table at E‐Defense. An HDRB, which is used in base‐isolated buildings, is modeled using hexahedral solid elements. The high damping rubber is modeled as an overlaid viscohyperelastic and elastic‐plastic constitutive model. However, material parameters are identified using the results for the HDRB subjected to one‐directional loading, and temperature dependences of the parameters are taken into account by a simple method based on empirical formulae for the HDRB because no cyclic coupon test was conducted for the high damping rubber used in the full‐scale tests. The combined structural and heat conduction analyses are conducted for a number of loading cases. The same hexahedral mesh of the HDRB is used for both structural and heat conduction analyses. Analysis results are presented for a one‐directional cyclic loading test, two‐directional loading test with elliptical orbit, and earthquake loading test. The results obtained by the tests and those obtained by the coupled structural and heat conduction analyses are compared. The coupling effect of the mechanical and thermal behaviors is clearly shown in the analysis results, although reductions of the equivalent stiffness and damping are not large because the number of loading cycles in the present analyses is limited.

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Experimental research on the time-varying law of performance for natural rubber laminated bearings subjected to seawater dry-wet cycles

Zhao

et al. 2019

Engineering Structures

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Experimental Study on Heat-Mechanics Interaction Behavior of Laminated Rubber Bearings

Cited by 11 publications

References 0 publications

Implications of strong earthquake ground motion duration on the response and testing of seismic isolation systems

Implications of strong earthquake ground motion duration on the response and testing of seismic isolation systems

Coupled structural and heat conduction FE analysis of laminated high damping rubber bearing

Experimental research on the time-varying law of performance for natural rubber laminated bearings subjected to seawater dry-wet cycles

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