A new approach for base isolation design in building codes

Ounis, Hadj Mohamed; Ounis, Abdelhafid; Djedoui, Nassim

doi:10.1007/s42107-019-00153-x

Cited by 6 publications

(2 citation statements)

References 8 publications

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“…The method combines the linear equivalent approach for design displacement using an iterative process with time history analysis. Numerical modelling, compared with global regulations, validates the approach, demonstrating satisfactory results in design displacement and base shear force alignment [29]. The study was conducted to investigate the impact of pulse-like ground motions on seismically isolated buildings using three nearfault record sets with varying pulse periods.…”

Section: Introductionmentioning

confidence: 87%

Dynamic behavior of high damping rubber bearings and lead rubber bearings under near-fault earthquakes

Patel,

Kumar,

Mourya

et al. 2024

Res. Eng. Struct. Mat.

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Civil engineering structures are susceptible to natural calamities such as earthquakes, floods, and strong winds. Base isolation is a proven method for protecting structures during earthquakes. It involves inserting a flexible layer between the foundation and superstructure to isolate the structure from earthquakes, thereby changing the system's dynamic characteristics. The present study compares the dynamic performance of passive base isolators, specifically High Damping Rubber Bearings (HDRBs) and Lead Rubber Bearings (LRBs), under near-fault ground motion conditions to assess their effectiveness in reducing seismic impact on structures. The isolator is first analyzed using a static general approach and validated against existing literature before undergoing dynamic analysis. In this research, the LRB isolation system is analyzed using a dynamic explicit approach in ABAQUS, while the HDRB is analyzed using a dynamic implicit approach. The behavior of these isolators is studied under seismic events such as those from the Imperial Valley, Managua, Loma Prieta, Northridge, and Kocaeli ground motions. The results indicate that LRBs significantly reduce acceleration at the top of the bearing compared to HDRBs. The maximum reductions in response are 68.42% for the Kocaeli earthquake in case of LRBs and 61.80% for the Northridge earthquake in case of HDRBs. The LRB shows a minimum acceleration response reduction of 57.24%, while for HDRB, it is 24.47% for the Imperial Valley records in both cases.

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Section: Introductionmentioning

confidence: 87%

Dynamic behavior of high damping rubber bearings and lead rubber bearings under near-fault earthquakes

Patel,

Kumar,

Mourya

et al. 2024

Res. Eng. Struct. Mat.

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show abstract

“…Yuan [60] introduced an innovative polyurethane elastomeric steel shim isolator attached through steel dampers designed to remain inactive during short displacements. Addressing the requirement for higher vertical capability bearings, particularly for heavyweight and larger span bridges, engineers introduced a polyurethane elastomer (PUE) material with enhanced shear performance [54]. PUE consists of both rigid and ductile sections, allowing for the adjustment of mechanical properties [67,68].…”

Section: Guidelines and Development Of Modern Isolatorsmentioning

confidence: 99%

Advancements in base isolation for seismic mitigation: Perspectives on elastomeric and lead rubber bearings

Patel,

Mourya,

Pandey

et al. 2024

Res. Eng. Struct. Mat.

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Base isolation represents an environmentally sustainable and highly effective technique for mitigating structural responses to strong seismic forces generated by plate boundary tectonic activities. Its primary benefits include preventing structural collapse, minimizing property damage, and safeguarding human lives during severe earthquakes. This passive, energy-efficient approach is often complemented by supplementary dampers to further reduce seismic impact. This study provides a comprehensive overview of elastomeric and lead rubber isolators, covering their theoretical, experimental, and numerical aspects. The paper examines the seismic response of structures equipped with elastomeric and lead rubber bearings, including a discussion of their pros and cons. This paper presents the comparison of fixed base and rubber isolated base in SAP 2000 to assess the effectiveness of base isolation. Additionally, it presents findings from shaking table tests, relevant building codes, and practical applications, considering the impact of events beyond initial design parameters. The review delves into the historical evolution of elastomeric and lead rubber-bearing systems, offering valuable insights into their contemporary understanding. Furthermore, the paper introduces three-dimensional isolators designed to attenuate ground motion responses in both horizontal and vertical directions. It investigates the effects of soil-structure interaction and evaluates isolator responses under blast and impact aircraft loading conditions. Notably, specific types of bearings exhibit exceptional energy dissipation capabilities during catastrophic seismic events, leading to reduced floor acceleration and inter-storey sway at critical levels. In conclusion, the study offers future recommendations and identifies potential constraints in this field

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Sustainable base isolation: a review of techniques, implementation, and extreme events

Patel,

Pandey,

Mourya

et al. 2024

Sādhanā

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A new approach for base isolation design in building codes

Cited by 6 publications

References 8 publications

Dynamic behavior of high damping rubber bearings and lead rubber bearings under near-fault earthquakes

Dynamic behavior of high damping rubber bearings and lead rubber bearings under near-fault earthquakes

Advancements in base isolation for seismic mitigation: Perspectives on elastomeric and lead rubber bearings

Sustainable base isolation: a review of techniques, implementation, and extreme events

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