Buckling-restrained brace using steel mortar planks; performance evaluation as a hysteretic damper

Iwata, Mamoru; Murai, Masatoshi

doi:10.1002/eqe.608

Cited by 203 publications

(79 citation statements)

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“…Several enhancements to BRBs have been proposed recently in order to improve their implementation in practical applications (e.g. Iwata and Murai, 2006;Zhao et al, 2010). Experimental tests on buckling restrained braces (BRBs), as isolated members, have demonstrated that these devices possess high energy dissipation capacity by means of stable and symmetric hysteretic loops when they are subjected to cyclic loads, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Experimental tests on buckling restrained braces (BRBs), as isolated members, have demonstrated that these devices possess high energy dissipation capacity by means of stable and symmetric hysteretic loops when they are subjected to cyclic loads, e.g. (Merrit et al, 2003;Black et al, 2004;Uang and Nakashima, 2004;Iwata and Murai, 2006;Zhao et al, 2010). However, experiments are still needed in order to corroborate their good behaviour when located in actual building frames subjected to seismic loads.…”

Section: Introductionmentioning

confidence: 99%

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

Guerrero

Escobar

2016

RIS

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Guerrero

Escobar

2016

RIS

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“…The BRB is fixed (Iwata and Murai, 2006;Tsai and Hsiao, 2008;Chou and Chen, 2010) or pinned to a frame in high rise buildings, and the pinned BRBs (Fahnestock et al, 2007;Wigle and Fahnestock, 2010;Zhao et al, 2012b) are the focus of this study.…”

Section: Introductionmentioning

confidence: 99%

“…For the pinned BRBs, to ensure that the yield region of a single core plate is well restrained by the external member, it is reinforced before the core comes out of the external member (Chen et al, 2001;Qiang, 2005;Iwata and Murai, 2006). Thus, there are three distinct failure modes of pinned BRBs: (1) Bending failure around the extended core region due to its insufficient load-bending capacity (Zhao et al, 2011); (2) Overall buckling failure due to deficient external member bending stiffness (Ju et al, 2009;Zhao et al, 2012a);and (3) Local press failure at the external member end due to significant stiffness weakening or immense contact force.…”

Section: Introductionmentioning

confidence: 99%

Design method of the pinned external integrated buckling-restrained braces with extended core. Part II: finite element numerical verification

Jiang

Guo

Tong

et al. 2015

J. Zhejiang Univ. Sci. A

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Abstract:The theoretical derivation from Part I (Jiang et al., 2015) has obtained the core contact force and the bending moment distribution of the external member in the single-wave core deformation mode. In addition, the design criteria of the external member and the strengthened core region (SCR) have also been obtained based on the understanding of the mechanical characteristics of the buckling-restrained brace (BRB). Based on the theoretical results from Part I, this study conducts the corresponding finite element (FE) numerical verification, and the BRB parameter analysis is also performed when the core deforms as a single-wave deformation. The influence of nine parameters on the core contact force and the external member stress is investigated. These parameters include the flexural rigidity of external member, the initial imperfection of external member, the core thickness and its width-to-thickness ratio, the pinned connector length, the external member length, the length of restrained strengthened core region with uniform section and the height of the wing-plate of the SCR, as well as the gap between the core and the external member. Lastly, the 12 examples of BRBs that are designed according to the proposed design criteria are analyzed using FE simulation, and the reliability of the theoretical derivation is also verified.

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“…1(a). To date, many investigations have been conducted on the seismic performance of BRBs [2,[14][15][16][17][18][19][20][21]. Unfortunately, few works attempted to evaluate the evolution of core member deformations and contact force distribution between core and external components, which in fact, is key to understanding the mechanical, also energy dissipation mechanism of BRBs.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of initial imperfection influence on the performance of buckling-restrained brace

et al. 2015

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Original scientific paperThe interaction between the core and external restraining members of the buckling-restrained brace (BRB) should be considered because of the significant effect it may cause on the overall performance of BRBs. The mechanism of core member multi-wave deformation is studied for the first time in this research, which presents an actual flexural wave-shape development of core member with increasing axial load and reveals the contact force distribution and development between the core and external restraining members by employing the refined finite element (FE) analysis. The object-oriented programming language Python is applied in the ABAQUS parameter analysis, and the influences of initial imperfection of the core and external restraining members, as well as that of the gap amplitude, on BRB performance are also investigated. Numerical simulation results show that the reverse bending of core member triggered sudden buckling in high-order modes, as well as the overall stress decrease in the external restraining member, whereas the local stress increased with the development of the core deformation waveform. The BRB with the core of symmetric initial imperfection performed worse than that with the core of anti-symmetric initial imperfection in compression. Furthermore, less initial deflection of external restraining members and gap amplitude leads to smaller contact force, thus the BRB can perform more effectively. Keywords: buckling-restrained brace; contact force distribution; gap; initial imperfection; refined finite element Numerička analiza utjecaja početne nesavršenosti na performansu spojnice ograničenog izvijanjaIzvorni znanstveni članak Potrebno je razmotriti interakciju između jezgre i vanjskih ograničavajućih elemenata kod spojnice ograničenog izvijanja (buckling-restrained brace -BRB) zbog značajnog učinka na ukupnu performansu spojnica. Mehanizam deformacije elementa jezgre u obliku nekoliko valova, po prvi se puta analizira u ovom istraživanju i predstavlja element jezgre kao savojni valoviti oblik s povećavajućim aksijalnim opterećenjem te pokazuje distribuciju i razvoj dodirne sile između vanjskih i ograničavajućih elemenata jezgre analizom konačnih elemenata. Objektno orijentiran programski jezik Python primijenjen je u ABAQUS parametrijskoj analizi, a također se analiziraju utjecaji inicijalne nesavršenosti jezgre i vanjskih elemenata ograničenja kao i amplitude razmaka na performansu BRB. Rezultati numeričke simulacije pokazuju da je povratno savijanje elementa jezgre rezultiralo iznenadnim izvijanjem kod viših tipova oscilacije kao i sveukupno smanjenje naprezanja u vanjskom ograničavajućem elementu, dok je lokalno naprezanje poraslo s razvojem valovitog oblika deformacije jezgre. Spojnica (BRB) s jezgrom simetrične inicijalne nesavršenosti funkcionirala je lošije od one s jezgrom protu-simetrične početne nesavršenosti u kompresiji. Nadalje, manji početni progib vanjskih ograničavajućih elemenata i amplitude razmaka rezultira manjom dodirnom silom te spojnica može stoga uči...

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Buckling-restrained brace using steel mortar planks; performance evaluation as a hysteretic damper

Cited by 203 publications

References 0 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

Design method of the pinned external integrated buckling-restrained braces with extended core. Part II: finite element numerical verification

Numerical analysis of initial imperfection influence on the performance of buckling-restrained brace

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