Performance assessment of buildings isolated by shape-memory-alloy rubber bearing: Comparison with elastomeric bearing under near-fault earthquakes

Gur, Sourav; Mishra, Sudib Kumar; Chakraborty, Subrata

doi:10.1002/stc.1576

Cited by 65 publications

(49 citation statements)

References 38 publications

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“…The resulting response time history is thereby almost cyclic in nature. In the absence of a constitutive model under transient pulse‐type loading, as in the case of blast loading, the Graesser–Cozzarelli model, which was also applied to represent the SMA behaviour under pulse‐type near‐fault earthquake, is adopted herein. According to this model, the one‐dimensional form of hysteretic force‐deformation behaviour is given by

{\overset{falsė}{F}}_{s} = k_{s} ([],, {\overset{falsė}{x}}_{s} - (||,, {\overset{x}{true}}_{s}) {|\frac{F_{s} - β_{s}}{F_{italicYS}}|}^{n - 1} ((),, |\frac{F_{s} - β_{s}}{F_{italicYS}}|)),

where,

β_{s} = k_{s} α_{s} ([],, x_{s} - \frac{F_{s}}{k_{s}} + f_{T} {|x_{s}|}^{c} italicerf ((),, {italicax}_{s})),

…”

Section: Characteristics Of Smas and Force‐deformation Behaviourmentioning

confidence: 99%

“…Performances of SMA assisted rubber bearing was evaluated by Ozbulut and Hurlebaus for protecting highway bridges against near‐field earthquakes and also compared with those of the SMA‐based sliding isolation system. Superior performance of SMA supplemented rubber bearing over the elastomeric bearing was studied for the seismic vibration control of structures by Gur et al and Das and Mishra, and a stochastic structural optimization study was also carried out by Gur et al…”

Section: Introductionmentioning

confidence: 99%

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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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{\overset{falsė}{F}}_{s} = k_{s} ([],, {\overset{falsė}{x}}_{s} - (||,, {\overset{x}{true}}_{s}) {|\frac{F_{s} - β_{s}}{F_{italicYS}}|}^{n - 1} ((),, |\frac{F_{s} - β_{s}}{F_{italicYS}}|)),

where,

β_{s} = k_{s} α_{s} ([],, x_{s} - \frac{F_{s}}{k_{s}} + f_{T} {|x_{s}|}^{c} italicerf ((),, {italicax}_{s})),

…”

Section: Characteristics Of Smas and Force‐deformation Behaviourmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Mondal

Ghosh²,

Chakraborty³

2017

Struct. Control Health Monit.

Self Cite

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“…The two most prominent properties of SMAs are the shape memory effect, which is the ability of the material to return to its original shape after heating, and superelastic effect, which is the ability of the material to recover its large inelastic deformations upon the removal of the load. A number of researchers have explored the potential application of superelastic SMAs in a seismic isolation system (Jalali et al, 2011;Ozbulut and Hurlebaus, 2010a, 2011a, 2011b, 2012Rahman Bhuiyan, A., and Alam, 2013;Gur et al, 2013) . Attanasi et al (2009) conducted an analytical study to investigate the feasibility of isolation systems with SMAs.…”

Section: Introductionmentioning

confidence: 99%

Performance of Isolated Buildings with Superelastic-Friction Base Isolators under High Seismic Hazards

Ozbulut¹,

Silwal²

2014

Structures Congress 2014

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The seismic performance of a three-story building isolated with superelasticfriction base isolator (S-FBI) systems is evaluated relative to ground motion intensity associated with a risk level of 2% probability of exceedance in 50 years. The S-FBI system consists of a flat steel-PTFE sliding bearing and superelastic shape memory alloy (SMA) elements. An analytical model of the isolated building with the S-FBI system is developed to determine the response of the structure subjected to a seismic event. Seismic response of the non-isolated building is also evaluated for comparison purposes. Nonlinear response history analyses are conducted under a suite of 22 ground motion records. Peak interstory drift ratio, peak isolator displacement and residual isolator displacement are selected as the primary response quantities. Performance objectives based on the story drift ratios are defined. The effects of mechanical properties of the S-FBI system on the performance of the isolated buildings are examined.

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“…The two most prominent properties of SMAs are the shape memory effect, which is the ability of the material to return to its original shape after heating, and superelastic effect, which is the ability of the material to recover its large inelastic deformations upon the removal of the load. A number of researchers have explored the potential application of superelastic SMAs in a seismic isolation system (Jalali et al 15 ; Ozbulut and Hurlebaus [16][17][18][19] ; Bhuiyan and Alam 20 ; Gur et al 21 ). Attanasi et al 22 conducted an analytical study to investigate the feasibility of isolation systems with SMAs.…”

Section: Introductionmentioning

confidence: 99%

Design of isolated buildings with S-FBI system subjected to near-fault earthquakes using NSGA-II algorithm

Ozbulut

Silwal

2014

SPIE Proceedings

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This study investigates the optimum design parameters of a superelastic friction base isolator (S-FBI) system through a multi-objective genetic algorithm and performance-based evaluation approach. The S-FBI system consists of a flat steel-PTFE sliding bearing and a superelastic NiTi shape memory alloy (SMA) device. Sliding bearing limits the transfer of shear across the isolation interface and provides damping from sliding friction. SMA device provides restoring force capability to the isolation system together with additional damping characteristics. A three-story building is modeled with S-FBI isolation system. Multiple-objective numerical optimization that simultaneously minimizes isolation-level displacements and superstructure response is carried out with a genetic algorithm (GA) in order to optimize S-FBI system. Nonlinear time history analyses of the building with S-FBI system are performed. A set of 20 near-field ground motion records are used in numerical simulations. Results show that S-FBI system successfully control response of the buildings against near-fault earthquakes without sacrificing in isolation efficacy and producing large isolation-level deformations.

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Performance assessment of buildings isolated by shape-memory-alloy rubber bearing: Comparison with elastomeric bearing under near-fault earthquakes

Cited by 65 publications

References 38 publications

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

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

Performance of Isolated Buildings with Superelastic-Friction Base Isolators under High Seismic Hazards

Design of isolated buildings with S-FBI system subjected to near-fault earthquakes using NSGA-II algorithm

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