Finite element analysis of beam-CFST column connections using replaceable buckling restrained fuses (RBRFs) as energy dissipation device

The use of a replaceable buckling restrained fuse (RBRF) as an element in a low damage beam-column connection has been examined using finite element analysis (FEA). There are several advantages associated with RBRFs in moment-resisting frames in regions of high seismicity, such as simplicity of fabrication, high energy absorption and reliability in the behaviour. The moment-resisting beam-column connection considered here is a double T-stub type connection from a steel beam to a concrete filled steel tube. The results from FE studies of RBRFs under cyclic loading are presented here. The purpose of this study is to ensure that the fuses will behave as expected when subjected to cyclic displacements representative of a maximum considered earthquake (MCE), i.e. the fuse yields in tension and compression without triggering any reduction in capacity due to buckling in the overall fuse or yielding at the beam flange or T-stub stem. Details of the installation of these fuses and dimensions of fuses that are appropriate for a particular beam size have been proposed.

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