Low-Cycle Fatigue Tests of a Type of Buckling Restrained Braces

Usami, Tsutomu; Wang, Chunlin; Funayama, Jyunki

doi:10.1016/j.proeng.2011.07.120

Cited by 50 publications

(24 citation statements)

References 7 publications

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“…It is shown in hysteretic curves of A508‐RS specimens, presented in Figure , with the constant strain amplitude that the first loop is hardly affected by the strain hardening effect while the others are gradually influenced by the strain hardening effect. It is identical with test results of steel BRBs . As shown in Figure , all the loops of hysteretic curves of the A606‐WS and A606‐NS specimens were hardly affected by the strain hardening effect, because the A6061S‐T6 aluminum alloy is amenable to the specific heat treatment.…”

Section: Resultssupporting

confidence: 81%

“…However, from failure modes of steel BRBs, the crack initiated from the edges of the BM's midspan and induced the failures of steel BRB specimens. Besides, the necking was not observed from the tested steel BM . Nevertheless, it is identical between aluminum alloy and steel BRBs that the rupture or the crack takes place in the midspan of the BM.…”

Section: Resultsmentioning

confidence: 82%

“…Before aluminum alloy BRB tests, some steel BRB specimens with nearly the same configuration as the welded aluminum alloy BRB were conducted to evaluate deformation and cumulative inelastic deformation capacities . Some results of steel BRBs are given and compared with test results of aluminum alloy BRBs in the following sections.…”

Section: Introductionmentioning

confidence: 99%

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Developing high‐performance aluminum alloy buckling‐restrained braces based on series of low‐cycle fatigue tests

Usami

Wang

Funayama

2011

Earthq Engng Struct Dyn

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SUMMARYIn order to enhance the durability of high-performance buckling-restrained braces (BRBs) used in bridge engineering, which are expected to withstand severe earthquakes three times without being replaced, aluminum alloys were employed to manufacture BRBs. A series of low-cycle fatigue tests, including 18 specimens, were conducted to address the low-cycle fatigue strength of the aluminum alloy BRB. Test results of all specimens show that stable hysteretic curves were obtained without overall buckling occurrence. Failure mode of the welded aluminum alloy BRB is obviously affected by the ribs' welding under the variable or constant strain amplitude condition. Therefore, another type of aluminum alloy BRB, the bolt-assembled BRB with or without spot-welded stoppers, is proposed and tested. Results showed that the low-cycle fatigue performance of bolt-assembled BRBs with stoppers improved four to five times compared with welded BRBs. However, the stoppers' spot welding has an adverse effect on the failure mode because the crack, which induced the specimen's failure, initiated from the spot weld toes of the stoppers. Both bolt-assembled BRBs with and without stoppers can meet the cumulative inelastic deformation requirement proposed for high-performance BRBs under the constant strain amplitude, not larger than 2%. In addition, under the variable strain amplitude condition, only the bolt-assembled BRB without stoppers has an excellent cumulative inelastic deformation capacity and sustains two cycles of 2.5% strain amplitude. Finally, recommended Manson-Coffin equations and preliminary cumulative damage formulae for welded and bolt-assembled BRBs are given as the references of the strain-based damage evaluation.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 82%

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Developing high‐performance aluminum alloy buckling‐restrained braces based on series of low‐cycle fatigue tests

Usami

Wang

Funayama

2011

Earthq Engng Struct Dyn

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“…Several findings exist in literature on steel fatigue properties. Recent experimental cyclic tests were conducted on all-steel buckling restrained dampers by Usami et al [23] where ε 0 and m factors of 0.21 and 0.488 were suggested and were used to estimate the minimum core length in SCBRBs in the present study. Low cycle fatigue fracture of the brace in the core occurs when the damage index (DI) reaches to one.…”

Section: Determining the Minimum Core Length In Scbrbsmentioning

confidence: 99%

Numerical investigation of seismic behavior of short-core all-steel buckling restrained braces

Hoveidae

Tremblay

Rafezy

et al. 2015

Journal of Constructional Steel Research

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“…This study mainly focuses on the first two failure modes. In addition, when a BRB is subjected to cyclic load, fatigue failure of the core may also occur (Usami et al, 2011;Wang et al, 2012). But if the elasticity of the external member can be guaranteed in its design, the fatigue failure will only be related to the material characteristics of the core.…”

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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Low-Cycle Fatigue Tests of a Type of Buckling Restrained Braces

Cited by 50 publications

References 7 publications

Developing high‐performance aluminum alloy buckling‐restrained braces based on series of low‐cycle fatigue tests

Developing high‐performance aluminum alloy buckling‐restrained braces based on series of low‐cycle fatigue tests

Numerical investigation of seismic behavior of short-core all-steel buckling restrained braces

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

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