Sliders and tension controlled reinforced elastomeric bearings combined for earthquake isolation

Chalhoub, Michel Soto; Kelly, James M.

doi:10.1002/eqe.4290190304

Cited by 11 publications

(4 citation statements)

References 6 publications

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“…and substituting this equation into (20) together with (21), we can determine the equation for q t ( )…”

Section: Transient Solution Of the Oscillation Of A Cylindrical Water...mentioning

confidence: 99%

“…Jacobsen 1 derived the impact response of a rigid, bottom‐supported cylindrical liquid storage tank under unidirectional horizontal motion based on fluid dynamics theory and verified it using vibration table testing. To investigate the effect of horizontal isolation on liquid dynamic response, Chalhoub et al 21 conducted vibration table tests on a cylindrical storage tank. Subsequently, Xue et al 22 studied the influence of different spectra on the liquid dynamic characteristics inside rectangular tanks through vibration table testing.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on characteristics of liquid dynamics in a cylindrical water tank under harmonic excitation

Zhao,

Jia,

et al. 2023

Earthquake Engineering and Resilience

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As the offshore engineering industry continued to develop, issues such as damage to storage structures due to liquid shaking became increasingly prevalent. This paper explored the dynamic response of liquid within a rigid cylindrical water tank subjected to harmonic excitation through vibration table tests, analyses, and numerical simulations. Using the Laplace equation and the Bessel function of the first kind, the analytical formula of liquid dynamic response was derived. A numerical model was established by ANSYS software to verify the accuracy of the analytical solution. At the same time, the response characteristics of hydrodynamic pressure and liquid level wave height were studied by vibration table tests. In this experiment, a rigid cylindrical water tank with varying depths of liquid was subjected to harmonic excitations utilizing a vibration table. In most cases, the experimental results agreed well with the analytical formula. However, under conditions of relatively severe liquid sloshing, there was a discrepancy in peak values between the experiment and the analytical formula. The experimental data indicated that both the hydrodynamic pressure and liquid level wave height increase with an increase in harmonic excitation frequency and amplitude.

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“…and substituting this equation into (20) together with (21), we can determine the equation for q t ( )…”

Section: Transient Solution Of the Oscillation Of A Cylindrical Water...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study on characteristics of liquid dynamics in a cylindrical water tank under harmonic excitation

Zhao,

Jia,

et al. 2023

Earthquake Engineering and Resilience

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“…Unlike the typical laminated elastomeric bearings used for bridge isolation (Chalhoub and Kelly 1990;Priestley et al 1996;Buckle et al 2002;Kunde and Jangid 2003;Najm et al 2007;Pradeep and In the past decades, poor considerations have been conducted on the seismic design of bridges on elastomeric pad bearings in the transverse direction in China. For example, it was typically assumed that the elastomeric pad bearings were modeled as elastic link elements while neglecting the possible sliding effect of the bearings, and that the RC shear keys would serve as a rigid block with infinite stiffness and strength to transmit superstructure inertia force to substructures.…”

Section: Introductionmentioning

confidence: 97%

Shake Table Test and Numerical Analysis of a Bridge Model Supported on Elastomeric Pad Bearings

Guan

2016

Journal of Earthquake Engineering

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Elastomeric pad bearings are widely applied in short-to medium-span girder bridges in China, with the superstructure restrained by reinforced concrete (RC) shear keys in the transverse direction. Field investigations after 2008 Wenchuan earthquake reveal that bearing systems had suffered the most serious damage, such as span falling, bearing displaced, and shear key failure, while the piers and foundations underwent minor damage. As part of a major study on damage mechanism and displacement control method for short-to medium-span bridges suffered in Wenchuan earthquake, a 1:4 scale, two-span bridge model supported on elastomeric pad bearings were recently tested on shake tables at Tongji University, Shanghai. The bridge model was subjected to increasing levels of four seismic excitations possessing different spectralA c c e p t e d M a n u s c r i p t Downloaded by [RMIT University Library] at 04:19 30 June 20162 characteristics. Two restraint systems with and without the restraint of RC shear keys were tested. A comprehensive analytical modeling of the test systems was also performed using OpenSees. The experimental results confirmed that for the typical bridges on elastomeric pad bearings without RC shear keys, the sliding effect of the elastomeric pad bearings plays an important role in isolation of ground motions and, however, lead to lager bearing displacement that consequently increases the seismic risk of fall of span, especially under earthquakes that contain significant mid-period contents or velocity pulse components. It is suggested from the test results that RC shear keys should be elaborately designed in order to achieve a balance between isolation efficiency and bearing displacement. Good correlation between the analytical and the experimental data indicates that the analytical models for the bearing and RC shear key as well as other modeling assumptions were appropriate.

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“…In some sliding isolation structures, the re-centring mechanism takes the form of cylindrical rubber springs [7}9]. In another system, the restoring mechanism has been provided by rubber bearings [10]. Similarly, the central and the peripheral rubber cores in resilient-friction base isolation (R-FBI) system provide restoring mechanism [11].…”

Section: Introductionmentioning

confidence: 99%

VFPI: an isolation device for aseismic design

Pranesh

Sinha

2000

Earthquake Engng. Struct. Dyn.

104

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Sliding isolators with curved surface are e!ective base isolation systems incorporating isolation, energy dissipation and restoring mechanism in one unit. However, practical utility of these systems, such as friction pendulum system (FPS) has limitations due to constant isolator period and restoring force characteristics. A new isolator called the variable frequency pendulum isolator (VFPI) that overcomes these limitations while retaining all the advantages has been described in this paper. VFPI has oscillation frequency decreasing with sliding displacement, and the restoring force has an upper bound so that the force transmitted to the structure is limited. The mathematical formulations for the response of a SDOF structure and energy balance are also described. Parametric studies have been carried out to critically examine the behaviour of structures isolated with VFPI, FPS and PF system. From these investigations, it is concluded that the VFPI combines the advantages of both FPS and PF system, without their undesirable properties. The VFPI performance is also found to be stable during low-intensity excitations, and fail-safe during highintensity excitations. VFPI is found to exhibit robust performance for a wide range of structure, isolator and ground motion characteristics clearly demonstrating its advantages.

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Sliders and tension controlled reinforced elastomeric bearings combined for earthquake isolation

Cited by 11 publications

References 6 publications

Experimental study on characteristics of liquid dynamics in a cylindrical water tank under harmonic excitation

Experimental study on characteristics of liquid dynamics in a cylindrical water tank under harmonic excitation

Shake Table Test and Numerical Analysis of a Bridge Model Supported on Elastomeric Pad Bearings

VFPI: an isolation device for aseismic design

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