Subassemblage tests and finite element analyses of sandwiched buckling-restrained braces

Chou, Chung‐Che; Chen, Shengyang

doi:10.1016/j.engstruct.2010.03.014

Cited by 262 publications

(126 citation statements)

References 10 publications

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“…There are two kinds of connection types between the BRB and frame, namely a fixed or pinned connection. Compared with a fixed BRB (Iwata and Murai, 2006;Tsai and Hsiao, 2008;Chou and Chen, 2010), a pinned BRB (Fahnestock et al, 2007;Wigle and Fahnestock, 2010;Zhao et al, 2012b) can only withstand axial forces and its end rotation is not restrained by the frame, which usually leads to BRB overall buckling failure. Accordingly, this study will focus on the strength design method of pinned BRBs.…”

Section: Introductionmentioning

confidence: 99%

Design method of the pinned external integrated buckling-restrained braces with extended core. Part I: theoretical derivation

Jiang

Guo

Wang

et al. 2015

J. Zhejiang Univ. Sci. A

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Abstract:The contact force distribution between the core member and the external member of a buckling-restrained brace (BRB) is closely related to its deformation mode, and it directly affects the working state of the extended core and external restraining member. This study focuses on a pinned BRB with extended core as a research object and investigates the stress state of a BRB. Based on the specified core deformation modes and contact force distributions, the contact force and the bending moment distribution in the external member are deduced. Lastly, by considering the mechanical characteristics of the external member and extended strengthened core region (ESCR), their strength design criteria are established. In the theoretical derivation of the design method, the influence of some parameters is considered, including the initial geometrical imperfection of the external member, the gap between the core and the external member, the rigidity reduction of the restrained strengthened core region (RSCR), and the change of contact position. Finite element numerical verification of the corresponding theoretical derivation is discussed in detail in another paper as Part II (Jiang et al., 2015).

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Section: Introductionmentioning

confidence: 99%

Design method of the pinned external integrated buckling-restrained braces with extended core. Part I: theoretical derivation

Jiang

Guo

Wang

et al. 2015

J. Zhejiang Univ. Sci. A

View full text Add to dashboard Cite

show abstract

“…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%

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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“…Moreover, the accuracy of this assessment was not verified. Some scholars [10,13] investigated the overall performance of BRBs by using the FE model. But further research on core waveform evolution and the influence of initial imperfection are absent.…”

Section: Introductionmentioning

confidence: 99%

“…Zhao et al [22] assumed that two-point-contact occurs at the end of the core and external restraining members, but Guo et al [8] deemed that the lateral deformation of the core and external restraining members were the same, and the contact force distribution appeared as a sine distribution pattern. Experimental research mainly aimed at investigating the overall performance of BRBs [5,10,19,23], but did not consider the variation of the core waveform and the contact force. Although the core buckling waveform was investigated in some articles [14,16], only the contact status and contact position of the core member were deduced from the variation of the external restraining member strain.…”

Section: Introductionmentioning

confidence: 99%

“…It consists of a steel core member bearing the entire axial load, external restraining members preventing the core member from buckling, and the gap or unbounded material that fills the space between the core and external restraining members [1][2][3]. According to the material and components of external restraining member, BRBs are often categorized as reinforced concrete BRBs [4,5], steel and concrete composite BRBs [2,6,7], and assembled BRBs [8][9][10][11][12][13]. The behaviour of assembled BRBs has recently been widely studied for their advantages, including the features of light weight, easy transportation to construction sites for assembly.…”

Section: Introductionmentioning

confidence: 99%

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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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Subassemblage tests and finite element analyses of sandwiched buckling-restrained braces

Cited by 262 publications

References 10 publications

Design method of the pinned external integrated buckling-restrained braces with extended core. Part I: theoretical derivation

Design method of the pinned external integrated buckling-restrained braces with extended core. Part I: theoretical derivation

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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