Study of Lead Rubber Bearings Operation with Varying Height Buildings at Earthquake

Мкртычев, Олег; Dzhinchvelashvili, Guram; Bunov, Artem A.

doi:10.1016/j.proeng.2014.12.010

Cited by 22 publications

(6 citation statements)

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“…The seismic impact calculation performed using the Ansys (LS-Dyna) software package utilized the central differences method, which in turn employs the explicit method of integrating motion equations. The LRB behavior diagram was set as an actual diagram approximated by an idealized non-liner diagram [6]. The computational model of the bearing in its general form is presented in figure 1.…”

Section: The Results Of Calculationsmentioning

confidence: 99%

A research on Performance Efficiency of Rubber Metal Support Structures

Мкртычев

Bunov

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The paper scrutinizes structural behavior of lead rubber bearings by a Chinese manufacturer subjected to a single-component seismic action. Several problems were solved using specialized software complexes, which conducted forth integration of motion equations through the explicit method or response spectrum method. Depending on the calculation method, the diagram of the bearing performance was assumed to be either an actual diagram approximated by an idealized non-linear diagram or an idealized linear diagram with a specific stiffness. The computational model was assumed to be a single-mass oscillator with a lumped mass. The effort undertaken facilitated the investigation of the patterns of horizontal displacement of the bearing top relative to bottom caused by earthquakes modeled as accelerograms with different spectral compositions. The behavior of the support structure was benchmarked against similar supports by another manufacturer. The paper presents the outcomes of the research effort and draws conclusions about the efficiency of using the bearings of this particular type and model.

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Section: The Results Of Calculationsmentioning

confidence: 99%

A research on Performance Efficiency of Rubber Metal Support Structures

Мкртычев

Bunov

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…LCRB is capable of reducing the structure responses such as isolator displacement [1], base [2] and superstructure [3] accelerations, storey shear forces and drifts [3], and presents reliable hysteretic behaviour in terms of maximum isolator displacement (MID), maximum isolator force (MIF) and energy dissipation capacity (EDC) [1,2,4,5]. When performing a numerical study [6], relative displacement and absolute acceleration were found reduced by 5.5 times and 8.5 times, respectively, as compared to the responses from fixed base structure. Furthermore, when using a nonlinear analytical model to predict the behaviour of the base isolated University of Southern California hospital building [7], nearly 50% of acceleration reduction, peak floor drifts less than 30% of the ASCE code specifications, and yielding of the bearing at the dissipation energy of 20% were observed.…”

Section: U *mentioning

confidence: 99%

Effects of Building Height and Seismic Load on the Optimal Performance of Base Isolation System

Dushimimana

Mbereyaho

et al. 2023

Arab J Sci Eng

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Seismic isolation has been widely accepted as one of the techniques that can be used to protect structures during earthquake ground motions. However, some challenges still exist such as the optimal control of excessive isolator shear strains imposed by some ground motions. The main purpose of this study was to assess the effects of building height variation and earthquake ground motion type on the optimal performance of the seismic isolation using lead core rubber bearing (LCRB). Nonlinear time history analysis for building models of various storeys isolated by LCRB and exposed to different real earthquakes was performed. To achieve this, the equations governing the motion of the isolated three different building models were presented, and an approach for solving the equations while taking into consideration of the optimized mechanical properties of the LCRB was developed. The LCRB performance was measured in terms of elastomer shear strains, derived after an optimal criterion leading to reliable substructure and superstructure responses was reached. The results showed that the combined effects of the earthquake type and building height significantly affect the substructure responses (maximum isolator displacement, energy dissipation capacity, maximum isolator force) and the superstructure responses (storey shear forces, storey drifts, floor displacements, and floor accelerations), which in some cases lead to a need for adding a fluid damper. In this regard, an attempt to couple the LCRB with nonlinear fluid viscous damper was made, and the performance of the hybrid was assessed. It was generally found that the hybrid can positively improve the substructure responses, thereby reducing the unwanted large elastomer shear strains without adversely affecting the superstructure responses.

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“…Experimental and computational studies with diffe rent screen shapes, with different materials for their filling, have shown that the effectiveness of damper barrier screens depends on many factors. The parameters of each damper should be taken separately, with the justification of their effectiveness as a seismic insulation system, taking into consideration specific regional soil conditions [16,17].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Ensuring the seismic resistance of a building using a geotechnical seismic insulating screen

Bessimbayev

Zhambakina

Niyetbay

2022

EEJET

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This paper considers the issue related to the protection of buildings and structures against seismic influences and the prevention, exclusion, or reduction of seismic hazards. The catastrophic destruction of modern «earthquake-resistant» buildings in Turkey and Taiwan has shown that existing methods of strengthening and reinforcing structures are not perfect and require further study. Analysis of existing approaches to ensuring seismic resistance showed that seismic insulation and seismic suppression systems still do not have a scientific and technical justification for the effectiveness of their operation from the point of view of ensuring the stability of structures. The estimation-dynamic models of the «base-seismic insulation-structure» system developed to date do not always make it possible to simulate the joint work of their interaction during an earthquake and account for the transformation of the seismic impact on the structure. An alternative technique has been devised, a geotechnical seismic insulation screen, as a seismic insulation system that reduces the intensity of seismic loads on the structure and ensures its seismic resistance. In a specific example, the effectiveness of this seismic insulation system is confirmed. This seismic insulation technique in the form of damper screens is characterized by reliability and manufacturability in ensuring the seismic resistance of objects under construction. The results of computational and experimental modeling of the interaction of an earthquake-insulated structure with a ground base found that the values of axial forces and bending moments in a building with a seismic insulating screen are less than in a building without seismic insulation by 30‒40 %. The geotechnical seismic insulation screen makes it possible to advance the development of new seismic insulation techniques and determine their effectiveness. This technique will also be effective when strengthening the base and seismic insulation systems of historical monuments, protecting them against seismic and dynamic influences.

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Study of Lead Rubber Bearings Operation with Varying Height Buildings at Earthquake

Cited by 22 publications

References 1 publication

A research on Performance Efficiency of Rubber Metal Support Structures

A research on Performance Efficiency of Rubber Metal Support Structures

Effects of Building Height and Seismic Load on the Optimal Performance of Base Isolation System

Ensuring the seismic resistance of a building using a geotechnical seismic insulating screen

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