Aseismic effect analysis of self-resetting buckling-restrained braced frame with friction fuse
DUAN Li1,2, XIE Qin1,3, LI Xia2, ZHOU Zhen4
1.State Key Lab of Building Safety and Built Environment, Beijing 100013, China;
2.School of Civil Engineering, Guizhou Institute of Technology, Guiyang 550003, China;
3.National Engineering Research Center of Building Technology, Beijing 100013, China;
4.MOE Key Lab of Concrete and Pre-stressed Concrete Structure, Southeast University, Nanjing 210096, China
Abstract：The introduction of a friction fuse (FS) at the end of the self-centering buckling-restrained brace (SC-BRB) to form the SC-BRB-FS can effectively avoid the fracture of pretensioned tendons caused by excessive structural deformation, as well as the problem of sharp drop in brace bearing capacity and a significant increase in residual deformation. Based on the code, 4-story and 8-story SC-BRB steel braced frames were designed, and the analysis models of the ordinary SC-BRB frame that can consider the fracture of tendons and the SC-BRB frame with friction fuse were established, respectively, according to the test results of the brace. The influence of the friction fuse on the seismic performance of the SC-BRB frames is determined by nonlinear dynamic analyses. The results show that the installation of a friction fuse at the ends of the SC-BRB can not only reduce the damage and collapse probability of the structure, but also reduce the structural residual deformation; increasing the activation deformation of the friction fuse will not affect the maximum displacement response of the structure, but can further reduce the residual deformation of the structure.
Key words: self-centering；friction fuse；braced frame；seismic performance
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