Global buckling prevention of reduced-core-length buckling-restrained braces: theoretical and numerical investigations

Buckling is a main problem in every structure. It is a sudden change in shape or deformation of a structural component under load. Under moderate to severe earthquakes, buckling of compressive braces may cause damage to the joints and connections. So Buckling-Restrained Braces (BRBs) have been widely implemented in framed structures to reduce damage during severe earthquakes. Unlike conventional braces that buckle under compression, the core of BRBs yields both in tension and compression under the restraining effect of the casing. A typical buckling-restrained brace (BRB) is composed of a ductile steel core, which is designed to yield in both tension and compression. To avoid global buckling in compression, the steel core is usually wrapped with a steel casing, which is subsequently filled with mortar or concrete. So in this work the deflection amplification factor of these braces are found out. As DAF predicts the maximum capacity of the structure, so a deep study in this field is necessary. DAF is the ratio of in-elastic deformations to elastic deformation. So after finding the DAF of these BRBs and by knowing the elastic deformation of the structure we can easily find the in-elastic deformation. For this works the analysis are carried out using etabs and abaqus software.

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Effect of brace end rotation on the global buckling behavior of pin-connected buckling-restrained braces with end collars

Engineering Structures ◽

10.1016/j.engstruct.2012.02.030 ◽

2012 ◽

Vol 40 ◽

pp. 240-253 ◽

Cited By ~ 34

Author(s):

Junxian Zhao ◽

Bin Wu ◽

Jinping Ou

Keyword(s):

Buckling Behavior ◽

Buckling Restrained Braces ◽

Global Buckling

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Experimental Study on High-Performance Buckling-Restrained Braces with Perforated Core Plates

International Journal of Structural Stability and Dynamics ◽

10.1142/s0219455419400042 ◽

2018 ◽

Vol 19 (01) ◽

pp. 1940004 ◽

Cited By ~ 21

Author(s):

Liang-Jiu Jia ◽

Yang Dong ◽

Hanbin Ge ◽

Kana Kondo ◽

Ping Xiang

Keyword(s):

Experimental Study ◽

Shear Deformation ◽

High Performance ◽

Numerical Study ◽

Slenderness Ratio ◽

Compressive Deformation ◽

Plane Shear ◽

Buckling Restrained Braces ◽

Out Of Plane ◽

Global Buckling

The compressive deformation is mainly contributed by axial compressive deformation and high-order in-plane and out-of-plane global buckling deformation for conventional buckling-restrained braces (BRBs). A novel type of all-steel BRBs with perforated core plates, termed as perforated BRBs (PBRBs), are proposed in this study, where shear deformation can occur in addition to the aforementioned deformations in a conventional BRB under compression. Experimental study was carried out using five specimens with different configurations of holes under cyclic loading. Stable hysteretic properties, high ductility, and energy dissipation capacity were obtained for the PBRBs. The effects of two parameters, i.e. the slenderness ratio of the chord and hole spacing factor defined as the ratio of the hole length to the hole spacing, on seismic performance of the specimens were investigated. The compressive deformation mechanisms of the PBRBs were further investigated through a numerical study. The compressive deformation was found to be composed of axial compressive deformation, flexural deformation owing to in-plane and out-of-plane global buckling, and in-plane shear deformation of the latticed core plate.

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Effect of Yielding Core Length on Cyclic Behaviour of Buckling Restrained Braces

Fifth International Conference On Advances in Civil, Structural and Mechanical Engineering -ACSM 2016 ◽

10.15224/978-1-63248-105-4-28 ◽

2016 ◽

Author(s):

SATISH KUMAR

Keyword(s):

Cyclic Behaviour ◽

Core Length ◽

Buckling Restrained Braces

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Global buckling prevention of end collared buckling-restrained braces: Theoretical, numerical analyses and design recommendations

Engineering Structures ◽

10.1016/j.engstruct.2017.09.014 ◽

2017 ◽

Vol 152 ◽

pp. 289-306 ◽

Cited By ~ 7

Author(s):

Jing-Zhong Tong ◽

Yan-Lin Guo

Keyword(s):

Numerical Analyses ◽

Design Recommendations ◽

Buckling Restrained Braces ◽

Global Buckling

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A new stiffness-strength-relationship-based design approach for global buckling prevention of buckling-restrained braces

Advances in Structural Engineering ◽

10.1177/1369433220974780 ◽

2020 ◽

pp. 136943322097478

Author(s):

Wen-Hao Pan ◽

Jing-Zhong Tong

Keyword(s):

Design Procedure ◽

Design Criterion ◽

Design Approach ◽

Design Solution ◽

Geometrical Parameters ◽

Element Analysis ◽

Buckling Restrained Braces ◽

Global Buckling ◽

Target Design ◽

Strength Relationship

This paper proposes a new stiffness-strength-relationship-based design approach that can pinpoint the target design solution for steel buckling-restrained braces (BRB). First, a stiffness–strength requirement interaction curve (the design criterion) with a very simple and easy-to-use form is derived based on a second-order analysis. This interaction curve clearly illustrates the opposing stiffness and strength requirements of the restraining system. Second, based on the geometrical parameters and material properties, a stiffness–strength relationship curve of the BRB restraining system is established. This second relationship curve is expressed by a linear function for a uniform steel BRB. By using the two analytical curves, the point of intersection defines the target design point. A straightforward design procedure for steel BRBs is then developed. A design example of steel BRBs is considered to demonstrate this easy-to-use design procedure for obtaining economical BRB designs. The design is verified and discussed by a rigorous finite element analysis.

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