Finite element analysis of base isolated buildings subjected to earthquake loads

Salomón, Omar; Oller, Sergio; Barbat, Álex H.

doi:10.1002/(sici)1097-0207(19991210)46:10<1741::aid-nme722>3.0.co;2-h

Cited by 28 publications

(16 citation statements)

References 18 publications

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“…HDRB is composed of alternating layers of rubbers and steel shims, and the rubber layers are reinforced by the steel shims. The reinforcing steel shims constrain the rubber layers from lateral expansion and provide high vertical stiffness, but have no effect on the shear stiffness (Salomon et al, 1999;Skinner et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

A rheology model of high damping rubber bearings for seismic analysis: Identification of nonlinear viscosity

Bhuiyan

Okui

Mitamura

et al. 2009

International Journal of Solids and Structures

106

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a b s t r a c tThe mechanical behavior of high damping rubber bearings (HDRBs) is investigated under horizontal cyclic shear deformation with a constant vertical compressive load. On the basis of experimental observations, an elasto-viscoplastic rheology model of HDRBs for seismic analysis is developed. In this model, the Maxwell model is extended by adding a nonlinear elastic spring and an elasto-plastic model (spring-slider) in parallel. In order to identify constitutive relations of each element in the rheology model, an experimental scheme comprised of three types of tests, namely a cyclic shear (CS) test, a multi-step relaxation (MSR) test, and a simple relaxation (SR) test, are carried out at room temperature. HDRB specimens with the standard ISO geometry and three different high damping rubber materials are employed in these tests. A nonlinear viscosity law of the dashpot in the Maxwell model is deduced from the experimental scheme, and incorporated into the rheology model to reproduce the nonlinear rate dependent behavior of HDRBs. Finally, numerical simulation results for sinusoidal loading are presented to illustrate capability of the proposed rheology model in reproducing the mechanical behavior of HDRBs.

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Section: Introductionmentioning

confidence: 99%

A rheology model of high damping rubber bearings for seismic analysis: Identification of nonlinear viscosity

Bhuiyan

Okui

Mitamura

et al. 2009

International Journal of Solids and Structures

106

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“…To model these materials, they can be assumed to be isotropic, isothermal, elastic, and incompressible. The effect of loading frequency and time on their behavior is also ignored (Salomon et al 1999;Venkatesh and Srinivasa Murthy 2012).…”

Section: Rubbermentioning

confidence: 99%

Numerical modeling of elastomeric seismic isolators for determining force–displacement curve from cyclic loading

Saedniya

Talaeitaba

2019

Int J Adv Struct Eng

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The ideal performance of seismic isolating systems during the past earthquakes has proved them to be very useful in protecting structures against earthquakes. The cyclic loading experimental tests are an important part in the process of completing the design of the isolators, yet they are very expensive and time consuming. Using the accurate analytical modeling of hysteresis tests and knowing the limitations and the amount of error of the finite elements model and its effect on designing the isolated structure make it possible to reduce the financial and time expenses involved in designing seismic isolators along with experimental tests. In the present study, the cyclic loading of two different isolating systems, namely, the high damping rubber bearing (HDRB) and lead rubber bearing (LRB) have been modeled and analyzed in ABAQUS and the outcomes were compared with the experimental results attained by other researchers. Regarding the fact that the most important and complicated component of the elastomeric isolating system is rubber, it was modeled using various strain energy functions. Other factors affecting the finite elements models of elastomeric isolators were also studied. After comparing the effective stiffness of the experimental sample with the analytical model of HDRB, the Yeoh function had the best performance in determining the effective stiffness of the isolating system with an error of less than 7%. In studying LRBs, too, three types of bearings with different dimensions and lateral strain values were studied; the polynomial function in shear strain value of 150% had the best performance in estimating effective stiffness and damping with errors of less than 3% and 18%, respectively.

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“…Multiple researches have been carried out in the past in order to evaluate and reduce seismic losses [15][16][17][18]. The reduction of the seismic vulnerability of RC structures was also the object of many articles, which start from its assessment by using different computational models and structural response analysis methods [19][20][21]. Griffith and Pinto (2000) studied the vulnerability of a "weak-column strong-beam" RC frame with 4 stories and 3 bays with infilled brick masonry.…”

Section: Backroundmentioning

confidence: 99%

Vulnerability Assessment of Reinforced Concrete Framed Structures Considering the Effect of Structural Characteristics

Olteanu¹,

Barbat²,

Budescu³

2015

TOCIEJ

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Considering the effects of earthquakes occurred during the last 15 years, this article focusses on finding solutions to minimize the human and economic losses. Several methodologies were developed in order to assess the vulnerability of the built environment with special reference to one of the most suitable structural systems in seismic areas for dwellings, offices or other functionalities, which is the reinforced concrete framed structure. Thus, the present article studies the influence on the vulnerability of reinforced concrete framed structures of geometric structural characteristics like the slab thickness, the building height and the plan configuration. Referring to the slab, it adds supplementary stiffness to the structure that can significantly influence upon its overall failure mechanism. 3D static nonlinear analyses are conducted by means of the SAP2000 computer program. The results are capacity curves which are used to develop the vulnerability curves. Three thicknesses are considered for the slab: 0.1 cm, 0.12 cm and 0.15 m. Medium and high rise structures are considered, with 4, and 8 levels, respectively, in order to determine the influence of the building height on the vulnerability index. Three plan configurations of the buildings are compared: a square one, a rectangular one and an L shaped one. For all the analyzed cases, the corresponding vulnerability curves are compared. The obtained results reveal that more realistic results for the behavior of the structure can be obtained if special attention is given to the structural characteristics, especially during the conceptual design process.

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Finite element analysis of base isolated buildings subjected to earthquake loads

Cited by 28 publications

References 18 publications

A rheology model of high damping rubber bearings for seismic analysis: Identification of nonlinear viscosity

A rheology model of high damping rubber bearings for seismic analysis: Identification of nonlinear viscosity

Numerical modeling of elastomeric seismic isolators for determining force–displacement curve from cyclic loading

Vulnerability Assessment of Reinforced Concrete Framed Structures Considering the Effect of Structural Characteristics

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