Seismic performance of steel frame structure with self-centering cable braces
In order to improve the seismic resilience of the braced frame structure,a novel self-centering cable brace has been proposed to effectively prevent compression buckling.It features a self-centering friction damper whose working principle has been analyzed both theoretically and experimentally,displaying a flag-shaped force-displacement curve with stable energy dissipation and self-centering capabilities.Based on this,three-story scale model steel frames with self-centering cable braces was designed,including models with prestressed dampers and without prestress,alongside a conventional steel frame model for comparison.Shaking table tests were conducted followed by the development of finite element models that accurately simulated the experimental process.Parametric studies were carried out and the results indicate that model with prestressed dampers shows almost no residual deformation post-earthquake,and the residual deformation in model without prestress is significantly less than that in conventional steel frame model.The displacement response is critically influenced by the level of initial prestress,the model with prestressed dampers exhibits less displacement than both conventional steel frame model and model without prestress.Furthermore,the maximum base moment in models with prestressed dampers and without prestress is reduced by 32.5％and 45.6％,respectively,compared to conventional steel frame model.With increasing seismic intensity,the floor acceleration amplification factor is observed to decrease progressively.The addition of energy dissipation elements is found to notably increase the residual displacement and seismic force on the structures,with the type of column base having a significant effect on the maximum displacement and residual deformation.
万方数据
维普
