Abstract:The design for traditional steel rigid connections cannot fully meet the desired seismic requirements, Though beam-co lumn connections with weakened beam end can approximately realize the concept of “strong column-weak beam”, in which the local buckling in the weakened zone and the overall lateral may occur in strong earthquakes and have insufficient capacity. A replaceable steel connection with low yield point metal was proposed, based on the concept of earthquakeげ-resilient structures. In this connection, the weakened parts in the flange slab and web plate were filled with low yield point metal, which yields then dissipates sufficient energy in earthquakes. Thus, damage to the main parts in the connection was slight, and the yield point metal could be replaced after the earthquake. The low yield point steel was selected as the replacement material, and the material constitutive relationship was obtained by a performance test. The seismic performance of the three types of connections, which include the traditional connection, beam end weaken connection, and replaceable connection under low cycle reciprocating load, were studied using the finite element method. In addition, the energy dissipation capacity and damage characteristics of different connections were compared. The multi-scale finite element models for the steel frames with different connections were analyzed by the inelastic time-history method. Both the computational efficiency and accuracy were assured. The analysis results approve that the replaceable connection can confine major damage in the replacement material and have better energy dissipation ability, safety reserves and resilience.