Performance of N-Z systems in the mitigation of underground blast induced vibration of structures

Mondal, Papiya D.; Ghosh, Aparna; Chakraborty, Subrata

doi:10.1177/1077546313481050

Cited by 18 publications

(4 citation statements)

References 25 publications

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“…e performance of baseisolated buildings under blast-induced ground motion (BIGM) has also captured attention in the recent times. Mondal et al [27,28] have studied the response of buildings isolated by lead-rubber bearing (N-Z system) under BIGM. Further, the performance of a base isolation system equipped with shape-memory alloy in protecting buildings under BIGM has been studied by Mondal et al [29].…”

Section: Introductionmentioning

confidence: 99%

Multihazard Response Control of Base-Isolated Buildings under Bidirectional Dynamic Excitation

Zelleke

Saha

Matsagar

2020

Shock and Vibration

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The issues of safety and posthazard functionality of structures under multihazard scenarios are some of the significant challenges in the current dynamic and rapidly growing urban environment. In this paper, multistory base-isolated buildings are investigated under the independent multihazard scenario of earthquake and blast-induced ground motion (BIGM). Multistory building models equipped with five different types of isolation systems, namely, the laminated rubber bearing (LRB), lead-rubber bearing (N-Z system), pure friction (PF) system, friction pendulum system (FPS), and resilient-friction base isolator (R-FBI) are assessed under bidirectional multihazard excitations. The suitability of the isolation systems and their key parameters in protecting multistory buildings is evaluated. Furthermore, the influence of the superstructure characteristics, such as the superstructure damping and the number of stories, is also assessed. The effect of bidirectional hazards on fixed-base buildings is also presented for comparison. The key response quantities of base-isolated buildings are presented and compared for different isolation systems. Parametric investigations are also conducted, and the trends of the response quantities are presented to study the influence of important parameters of isolation systems in protecting the buildings under the multihazard scenario of earthquake and BIGM. The results of the investigation show that the behaviors of the buildings equipped with various isolation systems are different for the two hazards. Moreover, the influences of the key parameters of the isolation systems are found to be different for various hazards. Therefore, the selection of design parameters of isolation systems shall be made with due consideration of the influence of multiple hazards. Additionally, the influence of the properties of the superstructure, such as the number of stories and the damping of the superstructure, on the behavior of the base-isolated buildings under the multihazard loading, is presented.

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Section: Introductionmentioning

confidence: 99%

Multihazard Response Control of Base-Isolated Buildings under Bidirectional Dynamic Excitation

Zelleke

Saha

Matsagar

2020

Shock and Vibration

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“…Moreover, the blast effects considered in case 1, i.e., R1, resulted in the most catastrophic destructions to the structure, considering the blast charge of 50 tons and a 100 m standoff distance. Blast wave R1 is primarily considered in the present study due to the accidental blast loading, as reported by Mondal et al [57]. Thus, by implementing appropriate retrofitting measures, such as shear walls, the story drift can be effectively controlled, ensuring the buildings' structural stability, and minimizing the potential for damage and failure during blast events.…”

Section: Resultsmentioning

confidence: 87%

Blast Mitigation of Reinforced Concrete Structures Incorporating Shear Walls in Modern Building Designs

Raikar,

Kangda,

Wadki

et al. 2023

Buildings

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Material science advancements have resulted in the development of high-strength concrete and steel reinforcement, allowing more efficient and stable buildings against natural and manmade disasters. Increasing security concerns and the potential threat from terrorist activities have led to the safety and resilience of structures against blast loads in modern construction. The present study investigates the performance of reinforced concrete shear walls in mitigating blast-induced vibrations. The study examines four different reinforced concrete buildings based on their shapes, namely square, rectangular, C-shaped, and L-shaped, to understand the blast behaviours with and without shear walls. The study presents a methodology to protect the regular and irregular buildings equipped with shear walls against blast loads at varying standoff distances of 100 m, 200 m, 300 m, and 400 m, respectively. The study also compares the efficiency of passive control dampers and shear walls in enhancing the buildings’ performance against blast vibrations. The best placement of the shear walls is also evaluated for all the selected buildings. The study also considers the effect of shear wall thickness in mitigating blast-induced vibrations in multi-storey buildings. The study also discusses the design guidelines and reinforcement detailing of shear walls to protect buildings against detrimental blast effects.

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“…Wu et al proposed mitigation of ground shock effects on structures by the provision of a sand layer in the foundation of the structure. The suitability of rubber in the foundation layer for vibration control of structures under BIGM was also reported by Ranasinghe et al Motivated by these studies, the effectiveness of the lead‐plug or New‐Zealand (N‐Z) BI system for structural protection against underground BIGM was studied by the authors and the occurrence of large bearing displacement and its residual deformation for high blast intensity were noted. This was also observed under near‐field earthquake motions that often contain a long‐period pulse in the velocity–time history as reported by Hall et al and Mazza and Vulcano and under such cases performance of the conventional bearings is not very reliable .…”

Section: Introductionmentioning

confidence: 74%

“…It has been noted in the previous study, that the normalized yield strength of the N‐Z isolator ( F 0 ) plays an important role in the isolation efficiency as well as affects significantly the peak and residual displacements of the bearings. As the normalized forward transformation strength of SMA ( F S 0 ) is analogous to F 0 , F S 0 will influence the efficiency of the SMARB isolation system.…”

Section: Numerical Studymentioning

confidence: 99%

Control of underground blast induced building vibration by shape-memory-alloy rubber bearing (SMARB)

Mondal

Ghosh²,

Chakraborty³

2017

Struct. Control Health Monit.

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Summary This paper focuses on the performance of shape‐memory‐alloy rubber bearings (SMARBs) compared to conventional lead‐plug or New‐Zealand (N‐Z) bearings in control of building vibration due to underground blast induced ground motion (BIGM). The performance is evaluated with regard to maximum acceleration and isolator displacement obtained by nonlinear time history analysis. In doing so the Bouc–Wen's model is used to represent the nonlinear behaviour of the N‐Z bearing and the superelastic behaviour of nickel–titanium‐based shape‐memory alloy is represented by the Graesser–Cozzarelli model. The underground BIGM input is modelled by exponentially decaying function. It is observed that though the N‐Z bearing is fairly effective in controlling the structural accelerations due to BIGM without excessive bearing displacements, there remains a problem with the residual bearing displacements. The latter, however, is found to be dealt with very effectively by the SMARB. Furthermore, the procedure to obtain the optimum design parameters of the base isolators under study is obtained by optimizing two mutually conflicting objective functions, that is, the minimization of peak acceleration as well as peak bearing displacement by converting the multiobjective optimization problem to a single composite objective function. The improved and robust control performance of SMARB compared to N‐Z bearing is elucidated through numerical study by considering a five‐storied shear building frame.

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Performance of N-Z systems in the mitigation of underground blast induced vibration of structures

Cited by 18 publications

References 25 publications

Multihazard Response Control of Base-Isolated Buildings under Bidirectional Dynamic Excitation

Multihazard Response Control of Base-Isolated Buildings under Bidirectional Dynamic Excitation

Blast Mitigation of Reinforced Concrete Structures Incorporating Shear Walls in Modern Building Designs

Control of underground blast induced building vibration by shape-memory-alloy rubber bearing (SMARB)

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