Numerical study of the seismic performance of steel frame-tube sub-structures fused by using bolt-connected replaceable steel shear links with double channel section
Due to the poor ductility and energy dissipation of the existing steel frame-tube structure(SFTS),the seismic performance of the structure is insufficient,and it also presents difficulties for post-earthquake repair.A proposed solution is to introduce a steel frame-tube structure with a replaceable shear link(SFTS-SL).The shear link is connected using double-channel steel web bolts.This paper presents design examples of both SFTS and SFTS-SL structures,selecting three substructures from each example and establishing the finite element model.Seismic performance is studied by nonlinear numerical analysis,revealing similar elastic lateral stiffness between SFTS-SL and SFTS.Although the ultimate bearing capacity of SFTS-SL is slightly lower,its ductility and energy dissipation capacity are superior.Compared with SFTS,SFTS-SL can concentrate plastic deformation on the energy dissipation beam section,while the remaining components remain in an elastic state,facilitating structural function restoration by replacing the damaged energy dissipation beam section.
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