Earthquake-Resistant Design with Rubber

Kelly, James M.

doi:10.1007/978-1-4471-3359-9

Cited by 231 publications

(193 citation statements)

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“…The behavior of isolation systems and the baseisolated structures is now well established and codes are developed for designing the base-isolated structures [5][6][7][8][9]. For non-linear isolation systems, the codes allow to use the equivalent linear model to permit the use of response spectrum method for designing the isolated structures.…”

Section: Introductionmentioning

confidence: 99%

Influence of isolator characteristics on the response of base-isolated structures

Matsagar

Jangid

2004

Engineering Structures

167

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Section: Introductionmentioning

confidence: 99%

Influence of isolator characteristics on the response of base-isolated structures

Matsagar

Jangid

2004

Engineering Structures

167

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“…Parameter measures the isolation degree [34], [38], is the previously defined mass ratio, b and s describe the viscous damping inherent respectively to the system and the isolator. The non-dimensional parameter measures the isolator strength, provided by the friction coefficient b u , relative to the seismic intensity.…”

Section: U T C U T K U T M U T U T M U T F T C U T C U T K U T M U Tmentioning

confidence: 99%

Optimal Friction Coefficients for Isolated Structures Depending on the Soil Condition

Castaldo¹,

Ripani²

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…The T R function for the special case of n = 1 is expressed by the following equation, see Kelly [9]:…”

Section: Equation Of Motion State-space Formulationmentioning

confidence: 99%

Energy and Transmissibility in Nonlinear Viscous Base Isolators

Μάρκου¹,

Manolis²

2016

Journal of Theoretical and Applied Mechanics

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Abstract. High damping rubber bearings (HDRB) are the most commonly used base isolators in buildings and are often combined with other systems, such as sliding bearings. Their mechanical behaviour is highly nonlinear and dependent on a number of factors. At first, a physical process is suggested here to explain the empirical formula introduced by J.M. Kelly in 1991, where the dissipated energy of a HDRB under cyclic testing, at constant frequency, is proportional to the amplitude of the shear strain, raised to a power of approximately 1.50. This physical process is best described by non-Newtonian fluid behaviour, originally developed by F.H. Norton in 1929 to describe creep in steel at high-temperatures. The constitutive model used includes a viscous term, that depends on the absolute value of the velocity, raised to a non-integer power. The identification of a three parameter Kelvin model, the simplest possible system with nonlinear viscosity, is also suggested here. Furthermore, a more advanced model with variable damping coefficient is implemented to better model in this complex mechanical process. Next, the assumption of strain-rate dependence in their rubber layers under cyclic loading is examined in order to best interpret experimental results on the transmission of motion between the upper and lower surfaces of HDRB. More specifically, the stress-relaxation phenomenon observed with time in HRDB can be reproduced numerically, only if the constitutive model includes a viscous term, that depends on the absolute value of the velocity raised to a non-integer power, i. e., the Norton fluid previously mentioned. Thus, it becomes possible to compute the displacement transmissibility function between the top and bottom surfaces of HDRB base isolator systems and to draw engineering-type conclusions, relevant to their design under timeharmonic loads.

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Earthquake-Resistant Design with Rubber

Cited by 231 publications

References 0 publications

Influence of isolator characteristics on the response of base-isolated structures

Influence of isolator characteristics on the response of base-isolated structures

Optimal Friction Coefficients for Isolated Structures Depending on the Soil Condition

Energy and Transmissibility in Nonlinear Viscous Base Isolators

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