Seismic performance of high-strength steel framed-tube structures with replaceable shear links based on performance design
The high-strength steel framed-tube structure with replaceable shear links(HSS-SFT-RSL)is a structural system with excellent seismic performance,which combines the advantages of strong energy-dissipating beam section,high lateral stiffness of framed-tube tube and high bearing capacity of high-strength steel.The traditional design method requires complex iterations and calculations to achieve the expected performance goals of the structure,and it is impossible to control the plastic development sequence and failure mode of the structure more accurately.In this paper,a set of 30-story HSS-SFT-RSL cases and common steel frame-tube structures with replaceable shear links(CS-SFT-RSL)cases are designed using the performance-based plastic design method(PBPD)proposed by the research group,and the seismic performance of the two cases is compared by static and dynamic elastic-plastic analysis.The research results demonstrate that the two cases designed by PBPD method have similar vertex lateral shift angles and damage modes,and the HSS-SFT-RSL case has slightly lower lateral stiffness but higher ultimate bearing capacity.Under the rare level earthquake,the energy-consuming beam segments of the two cases can participate in energy dissipation,and the inter-story lateral shift angles are evenly distributed along the height of the structure,which avoids the weak layer.In addition,the residual inter-story deformation is small,which is conducive to the replacement of the energy dissipation beam section and the rapid recovery of the structure after the earthquake.
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