Design recommendations for self-centering buckling restrained braces

Zhou, Ying; Tian, Wenbo; Xiao, Yi

doi:10.1016/j.engstruct.2022.115019

Cited by 10 publications

(3 citation statements)

References 31 publications

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“…The yielding deformation of these types of structures is usually determined with little error by the building geometry prior to applying the DDBD procedure. Here, it is assumed to be 69 mm as per Zhou et al (2022) for a six-story self-centering wall structure. The structural system is assumed to be located in Shanghai, China, for which the code-specified site design displacement spectrum is illustrated in Figure 20 (Chinese Seismic Code, 2016).…”

Section: Design Examplementioning

confidence: 99%

An equivalent damping ratio that accounts for ground-motion spectral shape for displacement-based design of flag-shaped hysteresis systems

et al. 2023

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Direct displacement–based design (DDBD) methodologies simplify the estimation of the seismic deformation demands of a nonlinear system by replacing it with an equivalent linear system that is characterized by an effective stiffness and equivalent damping ratio (EDR). The calculated EDR for flag-shaped hysteresis relationships vary greatly among existing DDBD methodologies, and these methodologies display a strong bias according to the shape of the ground-motion response spectrum. In the work reported here, the limitations of existing methods are demonstrated for three sets of ground-motions: a set of far-field ground-motions, a set of near-field ground-motions, and a set of physics-based simulated ground-motions that account for the effects of a deep sedimentary basin. The effect of spectral shape can be quantified by a new measure of spectral shape that is based on the spectral displacement ordinates between the system’s initial and equivalent periods. To address the limitations of existing methodologies, a new equation for calculating EDR was developed based on numerous nonlinear history analyses for all three sets of ground-motions and for a wide range of systems with flag-shaped hysteresis. In comparison with existing equations, the proposed equation for calculating EDR improves the accuracy of the DDBD methodology by lowering the bias and dispersion of the ratio between the displacement calculated by nonlinear analysis and the displacement calculated with the equivalent linear system. The usage of the new EDR equation in DDBD requires iteration, but neither numerical modeling nor analysis is needed. Specific steps of the application are demonstrated for a system with a flag-shaped hysteresis.

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Section: Design Examplementioning

confidence: 99%

An equivalent damping ratio that accounts for ground-motion spectral shape for displacement-based design of flag-shaped hysteresis systems

et al. 2023

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“…However, large residual deformations of post-earthquake structures will increase the cost of structural maintenance. To minimize structural damage, the self-centering BRB (SC-BRB) components have been implemented [6]. The SC-BRB components can dissipate energy and return to their initial position after earthquake loads, representing a novel and promising approach to control structural damage in seismic design [7,8].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of a New Self-Centering BRB and Its Application in Seismic Resistance of Frame Structure

Lin,

Zhou,

Shen

et al. 2024

Buildings

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In order to enhance the self-centering capacity of steel frame structures after earthquakes and reduce the tubes of traditional double-tube or triple-tube SC-BRB, an innovative single-tube self-centering buckling restrained brace (ST-SC-BRB) is proposed in this paper. Firstly, the structural configuration of the ST-SC-BRB component was described. Then, cyclic tests were conducted on one small-scaled BRB and one ST-SC-BRB with the same core steel plate. The test results indicate that the ST-SC-BRB specimen exhibits an excellent self-centering ability compared to the conventional BRB. However, their energy-dissipation capacities are still determined by the core steel plate. In addition, time–history analyses were conducted to evaluate the seismic performance of steel frame structures with BRBs and ST-SC-BRBs. The results suggest that the ST-SC-BRBs can effectively reduce the residual deformation of steel frame structures after earthquakes and contribute to the self-centering capacity of the steel frame structures. Finally, the influence of design parameters of ST-SC-BRB components on the seismic performance of steel frame structures was discussed. It is confirmed that the initial stiffness of the ST-SC-BRB component significantly influences the seismic response of the structure, while the self-centering ratio of the ST-SC-BRB component is a crucial factor in determining the residual deformations of the structure.

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“…The unpredictability of earthquakes determines that the destruction of earthquakes can only be reduced by improving the seismic performance of buildings at this stage [1]. As a new type of metal yielding energy dissipation brace, buckling restrained brace (BRB) has been widely used in the seismic design of existing structures and new structures around the world in recent years because of its clear mechanical principle and stable hysteretic performance [2].…”

Section: Introductionmentioning

confidence: 99%

Experimental of buckling restrained brace hysteretic performance with carbon fiber wrapped in concrete

Fang,

Lv,

Gao

et al. 2024

Archives of Civil Engineering

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Buckling restrained brace is an important structure for improving the seismic resistance of structures. Conducting research on new types of buckling restrained brace can improve the seismic performance and reliability of buckling resistant support. Four different types of buckling restrained braces specimens were designed and manufactured: cross-shaped square steel pipe members, cross-shaped round steel pipe members, cross-shaped carbon fiber members, and in-line carbon fiber members. By conducting quasi-static tests, the force displacement hysteresis curves, skeleton curves, stiffness degradation, equivalent viscous damping coefficient, and energy dissipation ratio of four different types of buckling restrained brace were analyzed. The research results showed that all four buckling restrained brace specimens have good hysteresis performance. The load-bearing capacity and energy consumption performance of the three specimens of square steel pipe, round steel pipe and carbon fiber with the same core unit are the same, but the inline type is worse than the cross type. The core unit specimen with a width of 80 mm is about 60% higher in bearing capacity and energy consumption than a specimen with a width of 50 mm. The core unit of some specimens undergoes multi-wave buckling. For carbon fiber specimens, the CFRP is prone to breakage due to the lateral thrust of the restraining unit. Therefore, steel hoop or stirrup should be added to the end to improve the restraint effect when designing and manufacturing.

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Design recommendations for self-centering buckling restrained braces

Cited by 10 publications

References 31 publications

An equivalent damping ratio that accounts for ground-motion spectral shape for displacement-based design of flag-shaped hysteresis systems

An equivalent damping ratio that accounts for ground-motion spectral shape for displacement-based design of flag-shaped hysteresis systems

Experimental Study of a New Self-Centering BRB and Its Application in Seismic Resistance of Frame Structure

Experimental of buckling restrained brace hysteretic performance with carbon fiber wrapped in concrete

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