Research on External Displacement-Amplification Self-Resetting Energy Dissipation Mechanism Based on the Energy Dissipation and Damping Requirements of Steel Frames

Displacement amplification mechanisms for existing displacement-dependent dampers are typically arranged between the inter-story spaces of steel frames， but the inter-story displacement of the structure is limited， and such dampers exhibit significant residual deformation after experiencing large displacements. To address these issues， a displacement amplification device was combined with a friction-based self-resetting damper to propose the external displacement amplification self-resetting energy dissipation system （EDAS）， which is connected to the frame in an inter-story， externally mounted configuration on the building facade. The basic structure and working principle of EDAS were first introduced， and the formula for calculating the displacement amplification coefficients of EDAS was derived. Finite element models of steel frames with EDAS installed and traditional steel frame substructures were subsequently developed to compare their hysteretic performance. Through parametric analysis of the finite element model of the EDAS-installed steel frame substructure， the accuracy of the proposed displacement amplification coefficient formula was validated. The results show that EDAS can effectively enhance the energy dissipation capacity of friction-based self-resetting dampers， giving EDAS both high energy dissipation and self-resetting capabilities. Installing EDAS significantly improves the energy dissipation and post-earthquake residual deformation control of steel frames. The parametric analysis results confirm the high accuracy of the proposed displacement amplification coefficient formula.