Advanced Steel Construction

Vol. 8, No. 3, pp. 212-225 (2012)



J. Wu 1,2, R.J. Liang 1, C.L. Wang 2,3 and H.B. Ge 2,3*

1 Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education,

Southeast University, Sipailou 2, Nanjing 210096, China

2 International Institute for Urban Systems Engineering, Southeast University, Sipailou 2, Nanjing 210096, China

3 Department of Civil Engineering, Meijo University, Tempaku-ku, Nagoya 468-8502, Japan

*(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. )


Received: 30 May 2011; Revised: 27 July 2011; Accepted: 12 August 2011




In order to investigate the bending moment of the core plate as well as the contact force between the core plate and the restraining component of a Buckling-Restrained Brace member, focus is set to the multi-wave buckling behavior of the core plate under increasing axial load. Based on the equilibrium equation of a segment subjected to axial and lateral forces, equations are derived to describe the deflection curve, the distribution of the moment of the core plate and the contact force. Discussion about these equations reveals the process of multi-wave buckling of the core plate, which is different with that of a free buckling without the lateral restraining component. The core plate experiences point contact, line contact and new wave generation repeatedly, and the axial loads corresponding to different states are given. A calculation example illustrates that the derived equations agree with numerical results, and an experimental result is used to verify the equations.


Keywords:Buckling-restrained brace, Restrained buckling, Contact, Multi-wave buckling


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