Evaluating the influence of stoppers on the low-cycle fatigue properties of high-performance buckling-restrained braces

Wang, Chunlin; Usami, Tsutomu; Funayama, Jyunki

doi:10.1016/j.engstruct.2012.03.040

Cited by 55 publications

(13 citation statements)

References 22 publications

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“…For a given condition, the longer slip length means higher frictional forces, smaller buckling wavelengths, larger normal thrust on the restrainer, and more nonuniform distribution of the axial deformations along the YS. Typically, a locking mechanism is implemented along the YS in BRBs to prevent free sliding of the restrainer . This mechanism is referred to as “stopper” and is typically used at the brace mid‐length to maximize the low cycle fatigue life of BRBs, ie,

L_{s} = 0.5 L_{y}

(Figure A).…”

Section: Resultsmentioning

confidence: 99%

Design and full‐scale experimental evaluation of a seismically endurant steel buckling‐restrained brace system

Dehghani

Tremblay

2017

Earthq Engng Struct Dyn

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SummaryThis paper presents the results of 12 full-scale tests on buckling-restrained brace (BRB) specimens. A simple-to-fabricate all-steel encasing joined by high-strength bolts was used as the buckling-restrainer mechanism. Steel BRBs offer significant energy dissipation capability through nondeteriorating inelastic response of an internal ductile core. However, seismic performance of BRBs is characterized by interaction between several factors. In this experimental study, the effects of core-restrainer interfacial condition, gap size, loading history, bolt spacing, and restraining capacity are evaluated.A simple hinge detail is introduced at the brace ends to reduce the flexural demand on the framing components. Tested specimens with bare steel contact surfaces exhibited satisfactory performance under the American Institute of Steel Construction qualification test protocol. The BRBs with friction-control self-adhesive polymer liners and a graphite-based dry lubricant displayed larger cumulative inelastic ductility under large-amplitude cyclic loading, exceeding current code minimum requirements. The BRB system is also examined under repeated fast-rate seismic deformation history. This system showed significant ductility capacity and remarkable endurance under dynamic loading. Furthermore, performance is qualified under long-duration loading history from subduction zone's megathrust type of earthquake. Predictable and stable performance of the proposed hinge detail was confirmed by the test results. Internally imposed normal thrust on the restrainer is measured using series of instrumented bolts. Weak-and strongaxis buckling responses of the core are examined. Higher post-yield stiffness was achieved when the latter governed, which could be advantageous to the overall seismic response of braced frames incorporating BRBs.

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L_{s} = 0.5 L_{y}

(Figure A).…”

Section: Resultsmentioning

confidence: 99%

Design and full‐scale experimental evaluation of a seismically endurant steel buckling‐restrained brace system

Dehghani

Tremblay

2017

Earthq Engng Struct Dyn

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“…As seen from this figure, measured positive axial force of the BRB was slightly greater than negative axial force after the first loading cycle of 2% story drift. This phenomenon contradicted the common behavior of a BRB: the maximum compression force is usually greater than the maximum tension force at the same displacement level because of friction developed between the steel core and the buckling restraining member (Ju et al 2009;Uang et al 2004;Wang et al 2012). The reason for this contradiction may be the layout of strain gages which did not entirely eliminate the effect bending moment and caused the error of axial force measurement.…”

Section: Hysteretic Responsementioning

confidence: 93%

“…An unbonding material or a very small air gap between the steel core element and the restraining exterior element is provided to minimize, or to eliminate if possible, the transfer of axial force from the steel core to the restraining element. Due to the confining effect of the exterior element, a BRB can yield in both tension and compression and dissipates a significant amount of hysteretic energy during earthquakes (Ju et al 2009;Uang et al 2004;Wang et al 2012;Zhao et al 2012a, b). BRBs have been used in many building structures throughout the world as economical seismic loadresistant systems.…”

mentioning

confidence: 99%

Experimental and Analytical Studies on a Reinforced Concrete Frame Retrofitted with Buckling-Restrained Brace and Steel Caging

Jiaguang

Mei

et al. 2015

Advances in Structural Engineering

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A hybrid seismic retrofit scheme, which utilizes a buckling-restrained brace (BRB) to enhance the lateral strength, stiffness and energy dissipation capacity of a seismically-weak reinforced concrete (RC) frame and steel caging to improve the flexural and shear strength of the deficient RC columns and beam-column joints, is proposed. Cyclic quasi-static tests were performed on two half-scale one-story, and single-bay RC frames to evaluate the efficiency of the hybrid retrofit technique. The performance of the BRB, the steel caging, and the connections of the retrofitted frame were studied and found to be satisfactory. The BRB significantly increased the lateral load resistance and energy dissipation capacity of the frame, and the steel caging could effectively change failure mechanism of the RC frame by preventing column failure. Analytical models were developed with OpenSees to simulate the experimentally observed behaviors. Reasonable agreements were achieved between the numerical and experimental results.

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“…The fracture location was random in the yielding portion of the brace, the failure of the extruded BRB was regarded as a brittle fracture (Wang et al, 2013). The BRBs with stoppers possess a higher low-cycle fatigue and cumulative inelastic deformation (CID) performance than those without stoppers, which were studied to develop the high-performance BRB (HP BRB) used in bridge engineering Wang et al, 2012). The experimental program conducted by Miller et al (2011Miller et al ( , 2012) that demonstrated that shape memory alloy (SMA) self-centering bucklingrestrained braces (SC-BRBs) provide stable hysteretic response with appreciable energy dissipation, self-centering ability, and large maximum and cumulative deformation capacities.…”

Section: Introductionmentioning

confidence: 99%

Performance testing and comparison of buckling-restrained braces with H and crisscross cross section unrestrained segments

2014

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Buckling-restrained braces (BRBs) deliver ductile, stable, and repeatable hysteretic behavior. The plastic deformation capacity of the BRBs indicates the good indexes both in terms of ultimate deformation and in terms of energy dissipation capacity. In this paper, the load-carrying elements of BRBs were fabricated with steel (Chinese Q235), and four layers of plastic film (0.2 mm in thickness) were used as unbounded materials to prevent the buckling of inner cores in higher modes and provide spaces to facilitate its lateral expansion in case of compression. The differences of ultimate compression and tension loads were controlled in a small range. The transformation of the unrestrained segment's section from crisscross shape to H shape can significantly improve the moment-resistance capacity of the unrestrained segment, avoiding buckling instability effectively due to evident moment stiffness enhancement. The experimental results of pseudo-static tests (PSTs) under cyclic load indicate: BRB with H cross section unrestrained segments can undergo fully-reversed axial yield cycles without loss of stiffness or strength, which have large ductility and superior seismic energy dissipation ability. There is obvious strain intensification in tension and compression phases. But there is evident decreasing of stiffness and strength on BRB with crisscross section unrestrained segments due to the buckling of unrestrained segment under compression, the ductility and energy dissipation ability decline distinctly.

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Evaluating the influence of stoppers on the low-cycle fatigue properties of high-performance buckling-restrained braces

Cited by 55 publications

References 22 publications

Design and full‐scale experimental evaluation of a seismically endurant steel buckling‐restrained brace system

Design and full‐scale experimental evaluation of a seismically endurant steel buckling‐restrained brace system

Experimental and Analytical Studies on a Reinforced Concrete Frame Retrofitted with Buckling-Restrained Brace and Steel Caging

Performance testing and comparison of buckling-restrained braces with H and crisscross cross section unrestrained segments

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