An analytical model for estimating restrainer design forces in bolted buckling-restrained braces

Dehghani, Marzieh; Tremblay, Robert

doi:10.1016/j.jcsr.2017.07.007

Cited by 31 publications

(17 citation statements)

References 19 publications

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“…10. The measured total normal thrust and it distribution compares well (within ~13%) with the results of the analytical model developed by the authors …”

Section: Resultssupporting

confidence: 76%

“…The regularly spaced pretensioned bolts along the restrainer were designed to resist the tension due to the anticipated maximum normal force generated by weak‐axis buckling of the core as well as the longitudinal shear due to global flexural response. The former was obtained from the model developed by the authors and confirmed by FE analysis . For the 2 basic design scenarios, the maximum anticipated tension is equal to 39 and 27 kN, respectively.…”

Section: Design Of Specimensmentioning

confidence: 82%

“…This normal thrust is generated when core buckling is constrained by the restrainer. The normal thrust is estimated using the method proposed by the authors in another publication for the critical weak‐axis buckling mode of the core illustrated in Figure D. The method is based on the approach outlined in Midorikawa et al In addition, the proposed method accounts for the effects of cyclic strain hardening, restraining stiffness, longitudinal frictional forces, and Poisson effects on core cross section.…”

Section: Design Of Specimensmentioning

confidence: 99%

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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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“…10. The measured total normal thrust and it distribution compares well (within ~13%) with the results of the analytical model developed by the authors …”

Section: Resultssupporting

confidence: 76%

Section: Design Of Specimensmentioning

confidence: 82%

Section: Design Of Specimensmentioning

confidence: 99%

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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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“…Buckling restrained braces (BRBs), which can provide lateral resistance as well as energy-dissipation capacity to the frameworks, have the functions of both the conventional steel brace and the metal energy dissipation damper [14][15][16][17][18][19]. Hector et al [20] performed a shaking table test on a reinforced concrete frame equipped with BRBs and found that the BRBs increased the damping of the structure and reduced the damage of the concrete frame.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Seismic Behavior of a Steel‐Concrete Hybrid Structure with Buckling Restrained Braces

Zhou

2020

Advances in Civil Engineering

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e damage to a concrete wall caused by a strong earthquake is generally concentrated at the bottom of the concrete wall, which seriously threatens the safety of the steel-concrete hybrid structure and is very difficult to repair after an earthquake. In this paper, a steel-concrete hybrid structure with buckling restrained braces at a scale of 1/10 is constructed and tested on a shaking table. First, the mechanical properties of the BRBs are obtained through a static reciprocating loading test. en, the dynamic properties and seismic response of the steel-concrete hybrid structure with BRBs are obtained through shaking table tests. e results show that (1) the energy dissipation capacity of the BRBs is very good, and none of the BRBs buckle during the shaking table tests; (2) the steel beams and columns are basically in an elastic state; (3) all the cracks on the concrete wall are microcracks, which are widely distributed in floors 1-8 of the concrete walls; (4) the maximum interstory drift angle reaches 1/40, which indicates that the ductility of the steel-concrete hybrid structure is very good. In conclusion, BRBs can significantly improve the seismic performance of the steel-concrete hybrid structures.

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“…In practical engineering, BRBs are widely used in concrete structures, and the failure mode of a concrete structure equipped with BRBs has attracted the attention of many researchers [6][7][8][9][10]. Wu et al [11] investigated the seismic behaviour of a concrete frame with BRBs by performing a pseudo-static test; the results indicate that the RC frame is damaged earlier than BRBs.…”

Section: Introductionmentioning

confidence: 99%

A New Buckling‐Restrained Brace with a Variable Cross‐Section Core

Zhou

Chen

et al. 2019

Advances in Civil Engineering

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In this paper, a new type of buckling-restrained brace characterized by a variable cross-section core (BRB-VCC) is proposed and investigated. The practical design equations of the BRB-VCC are derived based on mechanical and mathematical theories. Six specimens are designed and tested to clarify the mechanical behaviours of the BRB-VCC and to validate the reliability of the proposed equations. The test results show that (1) none of the specimens buckle under compression, as expected, and their ductilities and energy dissipation capacities are satisfactory; (2) the derived formulas are reliable and can be conveniently used in engineering practice; and (3) the yielding displacement of the BRB-VCC is approximately 70% that of the traditional TJ-1 buckling-restrained brace (BRB-TJ-1), which may yield earlier than the BRB-TJ-1 in concrete structures under the action of an earthquake.

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An analytical model for estimating restrainer design forces in bolted buckling-restrained braces

Cited by 31 publications

References 19 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 Study on the Seismic Behavior of a Steel‐Concrete Hybrid Structure with Buckling Restrained Braces

A New Buckling‐Restrained Brace with a Variable Cross‐Section Core

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