The seismic resilience improvement of steel frame building based on damping technology
In recent years,steel structure buildings have developed rapidly and been widely applied,making it crucial to enhance the seismic resilience of existing steel frame structures.To address this,a nine-story steel frame building is adopted as a prototype case,and two seismic retrofitting schemes are designed using viscous dampers and buckling-restrained braces.Nonlinear time-history analysis of the prototype case and the two retrofitted buildings are conducted using the finite element software Perform-3D.Based on the Standard for seismic resilience assessment of buildings,the resilience of the three structures is evaluated.By comparing the seismic responses and seismic resilience of the three structures,the results showed that the viscous damper retrofitting scheme has a relative advantage under design-basis earthquakes,while the buckling-restrained brace retrofitting scheme demonstrated better seismic reduction effects under rare earthquakes.In terms of seismic resilience,the viscous damper retrofitting case exhibites a good level of seismic resilience under design-basis earthquakes,whereas the buckling-restrained brace retrofitting case shows superior seismic resilience under rare earthquakes.The seismic resilience level of traditional seismic structures is Level 0,but through seismic retrofitting,the resilience level of buildings can be effectively improved from Level 0 to Level 1,significantly enhancing the seismic resilience of the buildings.The research results of this paper can provide a reference for the seismic resilience design of steel structure buildings in high seismic intensity areas.
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