Further results on the heating of single and multi-core lead-rubber bearings and dampers

Lee, Donghun; Constantinou, Michael C.

doi:10.1007/s10518-015-9830-2

Cited by 13 publications

(3 citation statements)

References 10 publications

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“…This equation is a simplification of a complex three‐dimensional heat conduction problem derived on the basis of analytic matching asymptotic expansions valid for small and large times (Equation ) of the problems of heat conduction in the steel end plates and steel shims of the LR bearing 18 . The conditions of validity of this solution have been investigated in Lee and Constantinou 45 that included tests with large number of cycles.…”

Section: Isolator Properties For Analysis With Explicit Considerationmentioning

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: Isolator Properties For Analysis With Explicit Considerationmentioning

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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“…A combination of Lead Rubber Bearings ( [8]) and Flat Sliders ( [5]) has been adopted for the analyzed case study structure. Precisely, the isolation layout has been obtained by considering an effective period of 3.0sec and an equivalent viscous damping equal to 30%; consequently, the isolation system Precisely, a Gaussian distribution can be assumed for the shear modulus, with mean value equal to 1 and a coefficient of variation equal to ±14%; on the other hand, for both yielding strain and stress, lognormal distributions can be considered, with unitary mode and 106% and 63% standard deviation for yielding strain and stress respectively.…”

Section: Mechanical Properties Of Isolatorsmentioning

confidence: 99%

Investigation of the Response Variability of Base-A Isolated Building Equipped With Lead Rubber Bearings

Furinghetti¹,

Pavese²

2021

14th WCCM-ECCOMAS Congress

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“…After the earthquake, because of the recentering capacity of the LRBs, the original position (corresponding to zero deformation) can be restored [21][22][23]. In recent years, LRBs have been extensively employed in structures to reduce the seismic effects because of their energy dissipation and recentering capacity [24,25]. In addition, one such study [26] presents sensitivity analysis on mechanical characteristics of LRBs.…”

Section: Base Isolation Technologymentioning

confidence: 99%

Seismic Performance of Base‐Isolated Precast Concrete Shear Wall Structure with AHW Connections

Wang

2018

Shock and Vibration

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To improve the seismic performance and seismic reliability of precast concrete shear wall (PCSW) structure with improved assembly horizontal wall connections (AHW connections), base isolation technology was proposed to be applied in the PCSW structure. Two 1/4-scaled structure models using the improved AHW connections were constructed: a lead-rubber bearing (LRB) base-isolated PCSW structure model and a base-fixed PCSW structure model. Shaking table tests were conducted on these two models with three strong ground motions to assess the seismic performance of the structures. It was found that the improved AHW connections in the base-isolated PCSW structure are useful and effective and that they fulfil the requirements to be met by the connections to withstand an earthquake. In addition, the maximum absolute acceleration and base shear force of the base-isolated PCSW structure model were less than those of the base-fixed PCSW structure model, and the isolation effect on the absolute acceleration responses and base shear responses increased with increase in the intensity of ground motions. In a word, the seismic performance and seismic reliability of PCSW structures can be effectively improved using base isolation technology. After this investigation, the seismic responses of the base-isolated PCSW structure model were numerically simulated using OpenSees software. There was a reasonable agreement between the numerically simulated results and test results; thus, the numerical simulation method and analysis model used for the base-isolated PCSW structure model were verified.

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Further results on the heating of single and multi-core lead-rubber bearings and dampers

Cited by 13 publications

References 10 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

Investigation of the Response Variability of Base-A Isolated Building Equipped With Lead Rubber Bearings

Seismic Performance of Base‐Isolated Precast Concrete Shear Wall Structure with AHW Connections

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