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An analytical method to model failure of steel beam plastic hinges due to
local buckling and low-cycle fatigue is proposed herein. This method is
based on the plastic collapse mechanism approach and a yield-line
plastic hinge (YLPH) model whose geometry is based on buckled shapes of
beam plastic hinges observed in experiments. Two limit states, strength
degradation
failure induced by local buckling and low-cycle fatigue fracture, are
considered. The proposed YLPH model was developed for FEMA-350 WUF-W,
RBS and Free Flange connections and validated in comparisons to
experimental data. This model can be used to estimate the seismic
rotation capacity of fully restrained beam-column connections in special
steel moment-resisting frames under both monotonic and cyclic loading
conditions.
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