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

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Abstract

An economic type of buckling-restrained braces (BRBs) to allow long spans and large capacities, the reduced-core-length BRBs (RCL-BRBs) are formed by sequentially assembling ordinary BRBs (yield portions) and ordinary braces (elastic portions) with high-strength bolts. This paper presents design recommendations for the global stability of the RCL-BRBs via theoretical and numerical investigations. In the analysis, the interaction between the yield and elastic portions of the RCL-BRBs is considered. First, the RCL-BRBs were classified into six types according to their compositions (the yield portion at one end, mid-span or both ends) and joint types (rigid or semi-rigid joint). Second, formulas for predictions of the elastic buckling loads of the RCL-BRBs were theoretically derived, and were verified by performing finite element (FE) eigenvalue buckling analyses. To investigate the nonlinear behavior of the RCL-BRBs, FE models considering both geometrical and material nonlinearities were built and calibrated with existing hysteretic tests of the RCL-BRBs. Then, a parametric study was conducted to investigate the effects of the geometrical parameters on the global stability behavior of the RCL-BRBs. Finally, based on the numerical results, the restraining ratio design requirements corresponding to the different types of RCL-BRBs were proposed to prevent their global buckling under axial compressive loads. Moreover, recommendations on the connection types between the yield and elastic portions of the RCL-BRBs are provided by analyzing a number of numerical examples.

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Abbreviations

Ac, Ae, Ar :

Cross-sectional area of the RCL-BRB components

dc, de, dr :

Tube diameter of the RCL-BRB components

E :

Young’s modulus

E t :

Tangent modulus after initial yielding

fyc, fye, fyr :

Yield stress of the RCL-BRB components

Ic, Ie, Ir :

Moment of inertia of the RCL-BRB components

k :

Elastic buckling coefficient

koe, kms, kbe :

Elastic buckling coefficient of RCL-BRB with its yield portion at one end, at mid-span or at both ends

L :

Length of RCL-BRB

l e :

Elastic portion length

l y :

Yield portion length

P max :

Maximum compressive load of the core

P cr :

Elastic buckling load of RCL-BRB

P cr,0 :

Euler buckling load of RCL-BRB with full-length yield portion section

Pcr,oe, Pcr,ms, Pcr,be :

Elastic buckling load of RCL-BRB with its yield portion at one end, at mid-span or at both ends

P y :

Initial yield load of the core

R y :

Strain hardening factor of the core

tc, te, tr :

Tube thickness of the RCL-BRB components

α :

Yield portion length factor

δ bm :

Axial displacement corresponding to the design drift angle

δ yc :

Yield displacement of the core

ε eq :

Equivalent axial strain of RCL-BRB

ε yc :

Yield strain of the core

η I :

Moment of inertia coefficient of RCL-BRB

ζ :

Restraining ratio

[ζ]:

Restraining ratio requirement

ζ oe , ζ ms , ζ be :

Restraining ratios of RCL-BRBs with their yield portions at one end, at mid-span and at both ends

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Acknowledgements

This study has been supported by research grants from the National Key R&D Program of China (Nos. 2016YFC0701201 and 2016YFC0701204), National Natural Science Foundation of China (No. 51678340) and Beijing Natural Science Foundation (No. 8172025).

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Authors and Affiliations

  1. Department of Civil Engineering, Tsinghua University, Beijing, 100084, China

    Jing-Zhong Tong, Yan-Lin Guo, Wen-Hao Pan & Peng Zhou

  2. Department of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai, 200235, China

    Min-Hui Shen

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  1. Jing-Zhong Tong
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  2. Yan-Lin Guo
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Correspondence to Wen-Hao Pan.

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Tong, JZ., Guo, YL., Pan, WH. et al. Global buckling prevention of reduced-core-length buckling-restrained braces: theoretical and numerical investigations. Bull Earthquake Eng 18, 1777–1804 (2020). https://doi.org/10.1007/s10518-019-00768-0

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