Evaluation of laminated rubber bearings for seismic isolation using modified macro-model with parameter equations of instantaneous apparent shear modulus

Koo, Gyeong-Hoi; Lee, Jae-Han; Yoo, B. O.; Ohtori, Yasuki

doi:10.1016/s0141-0296(98)00006-6

Cited by 16 publications

(6 citation statements)

References 4 publications

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“…The mechanical behaviour of the HDRB is quite complicated. Many mathematical models for the non-linear mechanical properties of HDRBs have been unfolded with satisfactory accuracy [9][10][11][12][13][14]. In this study, the Wen's model has been adopted Figure 6.…”

Section: Numerical Verificationmentioning

confidence: 99%

Experimental and computational verification of reasonable design formulae for base‐isolated structures

Tsai

Chen

Chiang

2003

Earthq Engng Struct Dyn

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SUMMARYIt is clear that base isolation is a sensible strategic design in attenuating the responses of a structural system induced by ground motions. The design of seismically isolated structures is mainly governed by the Uniform Building Code (UBC) published by the International Conference of Building O cials. The UBC code emphasizes a simple, statically equivalent design method that displacements of an isolated structure are concentrated at the isolation level. Therefore, the superstructure nearly moves as a rigid body and the design forces of elements above isolators are based on the behaviour of isolators at the design displacement. However, in the UBC code, the distribution of inertial (or lateral) forces over the height of the superstructure above isolation has been found to be too conservative for most isolated structures. In view of this, two simple and reasonable design formulae for the lateral force distribution on isolated structures have been proposed in this paper. Results obtained from a full-scale isolated structure tested on the shaking table and numerical analyses of two additional examples verify the suitability of design formulae. It is illustrated that the proposed formulae can predict well the lateral force distribution on isolated structures during earthquakes.

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Section: Numerical Verificationmentioning

confidence: 99%

Experimental and computational verification of reasonable design formulae for base‐isolated structures

Tsai

Chen

Chiang

2003

Earthq Engng Struct Dyn

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“…These models are useful for predicting the behavior in single loading cases or when it is required to determine the buckling load [15][16][17]24].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Laminated Rubber Bearings with a Numerical Reduction Model Method

2006

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In this paper, we present a reduction method for modeling slender laminated elastomeric structures, which is developed in the context of nearly incompressible hyperelasticity. This method, based on a finite element formulation, consists in projecting the unknown fields onto a polynomial basis in order to reduce the dimension of the problem and the model size. Two types of finite elements are used, one for plane-strain and the other for 3D structures. Comparisons with classical finite element models on single layers show the reliability of the present method. The method proposed successfully predicts the global and local behavior and since it reduces both the model size and the computing time. It can be used to model slender bearing consisting of several layers.

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“…Nowadays, several types of isolation devices are available in the market, which have been briefly mentioned in Section 1. Although more sophisticated models can be found in the literature to simulate the non-linear response of those devices [53][54][55][56], the present study is based on assuming a general elastic-hardening hysteretic force-displacement law (Figure 3), which, in principle, can represent the response of three main groups of isolation devices, such as LDRB (or HDRB), LRB and FPB. This bilinear force-displacement relationship of the isolation systems is identified by three main parameters: the initial stiffness K1 (before yielding/sliding), the post-yield stiffness K2 and the intersection Q between the post-elastic branch and the vertical axis ( Figure 3).…”

Section: Seismic Isolation Systemmentioning

confidence: 99%

On the Distribution in Height of Base Shear Forces in Linear Static Analysis of Base-Isolated Structures

2020

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Although base isolation is nowadays a well-established seismic-protection technique for both buildings and bridges, and several issues are still open and attract the interest of the research community. Among them, the formulation of computationally efficient and accurate analysis methods is a relevant aspect in structural design of seismic-isolated buildings. In fact, codes and guidelines currently in force in various parts of the world generally include the possibility for designers to utilize linear-elastic analysis methods based on equivalent linearization of the non-linear force-displacement response of isolators. This paper proposes a formula for defining the force distribution in height that should be considered in linear-static analyses to obtain a more accurate approximation of the actual structural response, supposedly simulated by means of non-linear time history analysis. To do that, it summarizes the results of a wide parametric analysis carried out on a batch of structures characterized by three different heights and various properties of base isolators. The reported results highlight that the equivalent static force distribution provided by both Italian and European codes tend to underestimate the actual seismic lateral forces acting on base-isolated buildings, whereas the inverted triangular distribution, proposed in various American codes and standards, is often conservative.

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Evaluation of laminated rubber bearings for seismic isolation using modified macro-model with parameter equations of instantaneous apparent shear modulus

Cited by 16 publications

References 4 publications

Experimental and computational verification of reasonable design formulae for base‐isolated structures

Experimental and computational verification of reasonable design formulae for base‐isolated structures

Analysis of Laminated Rubber Bearings with a Numerical Reduction Model Method

On the Distribution in Height of Base Shear Forces in Linear Static Analysis of Base-Isolated Structures

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