A low-tech dissipative buckling restrained brace. Design, analysis, production and testing

Palazzo, Gaetano Salvatore; Almansa, Francisco López; Cahís, X.; Crisafulli, Francisco J.

doi:10.1016/j.engstruct.2009.03.015

Cited by 70 publications

(32 citation statements)

References 9 publications

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“…Conversely, in Figure 8 both yielding points are alike since the core is significantly stockier. The mortar did not experience any damage; this result fits the after-test observations [Palazzo et al, 2009;Palazzo et al, 2011]. …”

Section: Tests In the University Of Gironasupporting

confidence: 77%

“…The sliding is ensured by a three-layer interface: the steel core is coated with Teflon®, lubricated with grease and wrapped with rubber. Figure 10 shows a plan view of the device, an elevation of one of their ends and two front views; the left front view includes a steel connector while the right one shows a bare core end [Palazzo et al, 2009]. These end connections are basically hinged.…”

Section: Tests In the University Of Gironamentioning

confidence: 99%

“…These experiments consist of testing four buckling-restrained braces under imposed axial displacements until failure [Palazzo et al, 2009;Palazzo et al, 2011]. Such devices are shaped as shown by Figure 1(b), being basically composed of a slender solid bar (cylinder) as dissipative steel core and a round thin-wall steel tube filled with high strength mortar (without shrinkage) as restraining casing.…”

Section: Tests In the University Of Gironamentioning

confidence: 99%

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A numerical model of the structural behavior of buckling-restrained braces

Almansa

Castro-Medina

Oller

2012

Engineering Structures

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This work presents a numerical model of the cyclic structural behavior of dissipative buckling-restrained braces, commonly used as an alternative to classical concentric braces for seismic protection of building frames and other structures. Such devices are usually composed of a slender steel core embedded in a stockiest casing that is intended to prevent its buckling when it is under compression. The casing is made either of mortar or steel, and a sliding interface is interposed between the core and the casing to prevent excessive shear stress transfer. The behavior of the steel core is described by a damage and plasticity model; the behavior of the mortar casing is described by an isotropic damage model and the sliding behavior of the interface is described by a contact penalty model. These three models are implemented in the Abaqus software package following an explicit formulation. The ability of this algorithm to reproduce the cyclic behavior of buckling-restrained braces is verified in a number of representative yet simple situations. The accuracy of the proposed model is checked by comparison with experimental results; a satisfactory agreement is obtained. Preliminary conclusions are issued and further research needs are identified.

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Section: Tests In the University Of Gironasupporting

confidence: 77%

Section: Tests In the University Of Gironamentioning

confidence: 99%

Section: Tests In the University Of Gironamentioning

confidence: 99%

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A numerical model of the structural behavior of buckling-restrained braces

Almansa

Castro-Medina

Oller

2012

Engineering Structures

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“…El pandeo de la barra es evitado por un tubo de acero relleno con mortero. Uno de esos especímenes, desarrollado y ensayado por los autores (Palazzo et al, 2009), se muestra en la figura 8.…”

Section: Caracterización De Las Bpr Bpr Seleccionadasunclassified

Diseño de un sistema de disipación pasiva de energía para un edificio en altura de Guayaquil

et al. 2017

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RESUMENSe considera en este trabajo un edificio sismorresistente aporticado de hormigón armado, de 21 niveles, diseñado para Guayaquil, Ecuador. El objetivo del estudio es desarrollar un procedimiento de diseño de un sistema de disipación pasiva de energía (barras de pandeo restringido) para mejorar los parámetros de respuesta de la estructura original. Se diseñan los disipadores según el procedimiento que se explicita, y luego se realiza un análisis dinámico de historia en el tiempo para la estructura con / sin disipadores, bajo la excitación de 5 acelerogramas. Los resultados del modelo numérico muestran la eficiencia del sistema de disipación propuesto. ABSTRACTIn this work, we consider a seismic resistant building made of reinforced concrete, of 21 levels, designed for Guayaquil, Ecuador. The objective of the study is to develop a procedure for the design of a passive energy dissipation system (restricted bending bars) to improve the response parameters of the original structure. The dissipators are designed according to the procedure that is explained, and then a dynamic history analysis is performed for the structure with / without dissipators, under the excitation of 5 accelerograms. The results of the numerical model show the efficiency of the proposed dissipation system. KEYWORDS: restricted buckling bars, design of energy dissipation systems.

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“…A new type of bidirectional-resistant ductile end diaphragm using BRB for applications in bridges was introduced [18]. A BRB device encased in steel tubing and mortar has been reported [19], and the authors found effective performance in response to cyclic loading. A buckling restrained braced frame (BRBF) with a pinned moment connection has been reported, favorable performance in mitigating residual drift, soft-story deformation, and preventing undesirable failure modes in the beam-column connection, and was analyzed using nonlinear dynamic analysis [20].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Non-Compression X-Bracing Systems Using Carbon Fiber Composite Cable for Seismic Strengthening of RC Buildings

Lee

2015

Polymers

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Cross-bracing (X-bracing) is one of the most popular methods of seismic retrofitting, and has been shown to significantly increase the structural stiffness and strength of buildings. Conventional steel X-bracing methods typically exhibit brittle failure at the connection between the brace and the building, or buckling failure of the braces. This study investigated the structural properties of a new type of non-compression X-bracing system using carbon fiber composite cable (CFCC). This non-compression X-bracing system uses CFCC bracing and bolt connections between structural members and the terminal fixer of the CFCC, instead of conventional steel bracing. The aim is to overcome the brittle and buckling failures that can occur at the connection and bracings with conventional steel X-bracing methods. We carried out cyclic loading tests, and the maximum load carrying capacity and deformation were investigated, as well as hysteresis in the lateral load-drift relations. The test results revealed that the CFCC X-bracing system installed in reinforced concrete frames enhanced the strength markedly, and buckling failure of the bracing was not observed.

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A low-tech dissipative buckling restrained brace. Design, analysis, production and testing

Cited by 70 publications

References 9 publications

A numerical model of the structural behavior of buckling-restrained braces

A numerical model of the structural behavior of buckling-restrained braces

Diseño de un sistema de disipación pasiva de energía para un edificio en altura de Guayaquil

An Experimental Study on Non-Compression X-Bracing Systems Using Carbon Fiber Composite Cable for Seismic Strengthening of RC Buildings

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