Technical gazette, Vol. 22 No. 6, 2015.
Original scientific paper
https://doi.org/10.17559/TV-20151026094554
Numerical analysis of initial imperfection influence on the performance of buckling-restrained brace
Ziqin Jiang
; College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, 100124, China
Yanlin Guo
; Department of Civil Engineering, Tsinghua University, Beijing, 100084, China
Hang Chen
; Department of Civil Engineering, Tsinghua University, Beijing, 100084, China
Xuqiao Zhang
; Department of Civil Engineering, Tsinghua University, Beijing, 100084, China
Abstract
The interaction between the core and external restraining members of the buckling-restrained brace (BRB) should be considered because of the significant effect it may cause on the overall performance of BRBs. The mechanism of core member multi-wave deformation is studied for the first time in this research, which presents an actual flexural wave-shape development of core member with increasing axial load and reveals the contact force distribution and development between the core and external restraining members by employing the refined finite element (FE) analysis. The object-oriented programming language Python is applied in the ABAQUS parameter analysis, and the influences of initial imperfection of the core and external restraining members, as well as that of the gap amplitude, on BRB performance are also investigated. Numerical simulation results show that the reverse bending of core member triggered sudden buckling in high-order modes, as well as the overall stress decrease in the external restraining member, whereas the local stress increased with the development of the core deformation waveform. The BRB with the core of symmetric initial imperfection performed worse than that with the core of anti-symmetric initial imperfection in compression. Furthermore, less initial deflection of external restraining members and gap amplitude leads to smaller contact force, thus the BRB can perform more effectively.
Keywords
buckling-restrained brace; contact force distribution; gap; initial imperfection; refined finite element
Hrčak ID:
149364
URI
Publication date:
14.12.2015.
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