Research on seimic behavior of linked rocking steel braced frame
In order to improve the energy dissipation capacity of linked rocking steel braced frame,new construc-tion measure of support span column base with elliptical hole section is proposed.The finite element software ABAQUS is used to establish the linked rocking steel braced frame model,and the quasi-static load is con-ducted to analyze the influence of design parameters such as lengths of the link beam,frame span and frame height on seimic behavior of the structure.The analysis results indicate that the structure dissipates energy by the energy dissipation column base and link beam,showing the reasonable failure mode,better energy dissipa-tion capacity and full hysteretic curve.With the increasing length of link beam,the ultimate bearing capacity in-creases first and then decreases,and the energy dissipation capacity gradually decreases.Link beams should be of shear yield type,thus the length of link beam is suggested to be in the range of(1.2～1.5)Mp/Vp.As the frame span increases and the frame height decreases,the energy dissipation capacity,lateral stiffness and bear-ing capacity are greatly improved.Based on the small deformation assumption and the virtual work principle,the typical yielding mechanism of rocking steel braced frame in the limit state is analyzed,and the calculation for-mula of ultimate bearing capacity is deduced,which is in good agreement with the finite element calculation re-sults and able to provide reference for engineering application.
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