In response to the problems that the traditional buckling-restrainted brace structure is difficult to repair and replaced in entirety after the earthquake,this paper proposes a new type of replaceable buckling-restraint brace(RBRB)based on the"initial point location"principle,which is easy to replace and can be restored by simply replacing the core unit of the energy-consuming section.In this paper,the numerical simulations were carried out using the finite element software ABAQUS to study the seismic performance of the new RBRB and to analyze the effect of different opening forms on the seismic performance of the RBRB.The research results show that the RBRB is reasonably constructed,has good energy dissipation capacity and fatigue performance,and a stable hysteretic curve.When the cross-sectional area of the core unit remains constant,the ductility of RBRB decreases gradually with the increase of number of rows of openings,but all of them can meet the large deformation requirement of RBRB under the rare earthquake;The compression deformation of core plate in RBRB opening section was found to be composed of compression,flexural and shear deformation.The shear deformation become more visible as the number of perforated rows increases,whice easily leads to in-place instability of the RBRB;Because the ductility and overall performance of RBRB with one row of holes are better than those with two and three rows of holes,and considering the processing difficulty and reducing the number of openings,it is recommended to use RBRB with one row of holes.
关键词
屈曲约束支撑/可更换/开孔/有限元分析/滞回性能
Key words
buckling-restrained brace/replaceable/perforated/finite element analysis/hysteretic behavior
维普
万方数据