Local buckling restraint condition for core plates in buckling restrained braces

Takeuchi, Tōru; Hajjar, Jerome F.; Matsui, Ryota; Nishimoto, Kohji; Aiken, Ian D.

doi:10.1016/j.jcsr.2009.09.002

Cited by 126 publications

(72 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the bending moment at the restrainer-end zone exceeds the restrainer moment transfer capacity M r p , the load on the BRB exceeds its ultimate strength, eventually resulting in buckling. Firstly, the gusset plates are assumed to be rigid (K Rg → ∞), and out-of-plane deformations of the connection zone during the mechanism phase are assumed to be of sinusoidal shape, as shown in Figure 7(a) and given in Equation (4). Figure 6.…”

Section: Stability Condition For Brbs Including Connectionsmentioning

confidence: 99%

Out‐of‐plane stability of buckling‐restrained braces including moment transfer capacity

Takeuchi

Ozaki²,

Matsui

et al. 2013

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

SUMMARYBuckling-restrained braces (BRBs) are widely used as ductile seismic-resistant and energy-dissipating structural members in seismic regions. Although BRBs are expected to exhibit stable hysteresis under cyclic axial loading, one of the key limit states is global flexural buckling, which can produce an undesirable response. Many prior studies have indicated the possibility of global buckling of a BRB before its core yields owing to connection failure. In this paper, BRB stability concepts are presented, including their bending-moment transfer capacity at restrainer ends for various connection stiffness values with initial out-of-plane drifts, and a unified simple equation set for ensuring BRB stability is proposed. Moreover, a series of cyclic loading tests with initial outof-plane drifts are conducted, and the results are compared with those of the proposed equations.

show abstract

Section: Stability Condition For Brbs Including Connectionsmentioning

confidence: 99%

Out‐of‐plane stability of buckling‐restrained braces including moment transfer capacity

Takeuchi

Ozaki²,

Matsui

et al. 2013

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

show abstract

“…Takeuchi et al [6][7][8][9][10] proposed a method to calculate buckling wave length using tangent modulus after yielding of the core, and then obtain the contact force according to the force equilibrium. Some experiments indicated that the buckling wave length calculated using the reduced or equivalent modulus, rather than the tangent modulus, agreed with the test results [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Buckling mechanism of steel core of buckling-restrained braces

Mei

2015

Journal of Constructional Steel Research

View full text Add to dashboard Cite

“…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%

“…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. Moreover, the accuracy of this assessment was not verified.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

View full text Add to dashboard Cite

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...

show abstract

Local buckling restraint condition for core plates in buckling restrained braces

Cited by 126 publications

References 12 publications

Out‐of‐plane stability of buckling‐restrained braces including moment transfer capacity

Out‐of‐plane stability of buckling‐restrained braces including moment transfer capacity

Buckling mechanism of steel core of buckling-restrained braces

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

Contact Info

Product

Resources

About