A method for preliminary seismic design and assessment of low-rise structures protected with buckling-restrained braces

Guerrero, Héctor; Ji, Tianjian; Terán‐Gilmore, Amador; Escobar, J. Alberto

doi:10.1016/j.engstruct.2016.05.015

Cited by 44 publications

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“…In the DBD approach, the increased damping ratio can be considered directly in the estimation of the displacement demands, e.g. in equation (10) by Guerrero et al (2016) the damping ratio provided by the BRBs (x2) can be added to the damping ratio provided by the primary structure (x1).…”

Section: Discussionmentioning

confidence: 99%

“…The design method proposed by Guerrero et al (2016), which is based in the control of the lateral displacements, was applied. After a few iterations, it was observed that BRBs with cross-section areas of 2 mm 2 (in storeys one and two) and 1.1 mm 2 (in storeys three to five) provided satisfactory control of the lateral response while the main frame remained within its elastic deformation range.…”

Section: Design Of the Brbsmentioning

confidence: 99%

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Experimental Studies of a Steel Frame Model With and Without Buckling-Restrained Braces

Guerrero

Escobar

2016

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This paper presents comparative experimental studies of a five-storey steel-frame model at a scale of 1/10 with, and without, buckling-restrained braces (BRBs). The building model was subjected to free vibration tests and shaking table tests. The latter were conducted using low-intensity white noise and seismic input. From the free vibration tests and shaking table tests with low-intensity white noise, it was found that the BRBs contributed a significant amount of damping. This happened to the model even at low levels of vibration. The shaking table tests with seismic input were conducted using seven earthquake records, taken in the lakebed zone of Mexico City with seismic intensities from pga=0.1g to 0.25g. At an intensity of pga=0.1g, the results show that the model fitted with BRBs had a significantly smaller response than the bare model, in terms of displacement, inter-storey drift, floor velocity and floor acceleration. The higher intensities were only applied to the model fitted with BRBs. The results indicate that the model with BRBs was able to withstand about 2.5 times the seismic intensity of the bare model, in terms of lateral displacement, inter-storey drift and Arias Intensity, as a measure of the energy contents of the movement. At the end of the tests, all BRBs were removed and the model remained in its original undamaged state.Keywords: buckling-restrained braces (BRBs); free vibration tests; shaking table tests; steel-frame model; lakebed zone of Mexico City RESUMENEste artículo presenta estudios experimentales en un marco de acero de cinco niveles, a escala natural de 1/10, con y sin contraventeos restringidos al pandeo (CRP). El modelo fue sometido a pruebas de vibración libre y en mesa vibradora. Estas últimas se realizaron con movimientos a base de ruidos blancos de baja intensidad y con movimientos sísmicos. De las pruebas de vibración libre y de mesa vibradora con ruidos blancos se encontró que los CRP incrementaron de manera muy importante el nivel de amortiguamiento en el modelo. Esto sucedió aun cuando el modelo se sometió a niveles de vibración baja que no generaron respuesta no lineal. Para las pruebas con movimientos sísmicos se utilizaron siete acelerogramas registrados en la zona del lago de la Ciudad de México, escalados a intensidades entre pga=0.1g y 0.25g, siendo pga la aceleración máxima de piso y g la aceleración de la gravedad. A la intensidad de pga=0.1g, los resultados muestran que el modelo equipado con CRP tuvo una respuesta mucho menor al caso sin CRP; esto en términos de desplazamientos, distorsión de entrepiso, velocidad y aceleraciones de piso. Las intensidades mayores fueron sólo aplicadas en el modelo con CRP. Los resultados indican que el modelo con CRP pudo acomodar hasta 2.5 veces más Artículo recibido el 17 de diciembre de 2015 y aprobado para su publicación el 7 de diciembre de 2016. Se aceptarán comentarios y/o discusiones hasta cinco meses después de su publicación.

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Section: Discussionmentioning

confidence: 99%

Section: Design Of the Brbsmentioning

confidence: 99%

Experimental Studies of a Steel Frame Model With and Without Buckling-Restrained Braces

Guerrero

Escobar

2016

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“…Feng et al proposed an elastic displacement spectrum‐based design method to directly determine the BRB sectional areas of steel BRBFs . Guerrero et al developed a method for preliminary seismic design of dual steel BRBFs by employing the seismic response of a dual single‐degree‐of‐freedom oscillator . Note that these design methods are mainly dealing with the BRB configuration of steel BRBFs, and how to design the BRB‐RCFs in an integrated manner to quantify the BRB‐RC frame interaction has not been systematically addressed.…”

Section: Introductionmentioning

confidence: 99%

Seismic design and performance analysis of buckling‐restrained braced RC frame structures

Bai

et al. 2019

Structural Design Tall Build

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Summary Due to the stable hysteretic behavior, buckling‐restrained braces (BRBs) have been increasingly adopted in reinforced concrete (RC) frame structures to develop a dual structural system (BRB‐RCF). This study proposed an alternative strength‐based design approach that decomposes the dual BRB‐RCF system into two independent RC frame and BRB system using the BRB‐carrying story shear ratio. The design of RC frame is performed in an integrated manner by considering the BRB postyielding force demands. Three RC frames with five, 10, and 15 stories were employed as prototype structures, and seven story shear ratios ranging from 0.1 to 0.7 were used to generate a total of 21 structural modes. The material usage, maximum axial compression ratio of columns, and elastic interstory drift ratio were compared for different story shear ratios. Nonlinear dynamic analysis of the BRB‐RCFs subjected to 12 ground motions were carried out. The seismic response including the maximum interstory drift ratio, hysteretic energy dissipation ratio, and actual BRB‐carrying story shear ratio were systematically assessed for different design story shear ratios. Based on the considerations of material usage and seismic performance, it is suggested that the design BRB‐carrying story shear ratio should be in the range of 0.3 to 0.5.

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“…Bruneau et al [19] proposed a damage-controlled design approach, which assumes that all the damages are concentrated on the BRBs and the main vertical loading structure is in the elastic state. Guerrero et al [20] proposed a performance-based design method of the building reinforced by BRBs, which can be used to promptly calculate the response of low-rise regular buildings. Barbagallo et al [21] proposed a seismic design method for the concrete reinforcement structure with BRBs based on the EC8 code.…”

Section: Introductionmentioning

confidence: 99%

A New Buckling‐Restrained Brace with a Variable Cross‐Section Core

Zhou

Chen

et al. 2019

Advances in Civil Engineering

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In this paper, a new type of buckling-restrained brace characterized by a variable cross-section core (BRB-VCC) is proposed and investigated. The practical design equations of the BRB-VCC are derived based on mechanical and mathematical theories. Six specimens are designed and tested to clarify the mechanical behaviours of the BRB-VCC and to validate the reliability of the proposed equations. The test results show that (1) none of the specimens buckle under compression, as expected, and their ductilities and energy dissipation capacities are satisfactory; (2) the derived formulas are reliable and can be conveniently used in engineering practice; and (3) the yielding displacement of the BRB-VCC is approximately 70% that of the traditional TJ-1 buckling-restrained brace (BRB-TJ-1), which may yield earlier than the BRB-TJ-1 in concrete structures under the action of an earthquake.

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A method for preliminary seismic design and assessment of low-rise structures protected with buckling-restrained braces

Cited by 44 publications

References 20 publications

Experimental Studies of a Steel Frame Model With and Without Buckling-Restrained Braces

Experimental Studies of a Steel Frame Model With and Without Buckling-Restrained Braces

Seismic design and performance analysis of buckling‐restrained braced RC frame structures

A New Buckling‐Restrained Brace with a Variable Cross‐Section Core

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