| The column spaces and the beam in steel framed-tube structure is small and deep,which results in the column-ends yield during the several earthquakes.Furthermore,considering the small span-to-depth ratio for the beam,the developments of the plastic hinges at beam-ends are limited,leading the poor energy dissipation capacity of framed-tube structure.In order to improve the seismic performance and resilience of framed-tube structure,high-strength steel framed-tube structure with replaceable shear link（HSS-SFT-RSL）is purposed,which combines the advantages of shear link,high-strength steel and framed-tube structure.To investigate the seismic behavior and replaceability of high-strength steel framed-tube structure with replaceable shear link,a 2/3-scale plane specimens of HSS-SFT-RSL which is single bay and story was designed.The shear link Q235steel,the columns and deep beams used Q460 steel,and.To study the failure mode,hysteretic performance and replaceability,the specimen was tested under cyclic loading.The test results show that the specimen have plump hysteretic loops,stable cyclic energy dissipation and plastic deformation capacity.The shear link of specimens mainly failed as buckling of link web,and tearing of the link web.The overstrength factor of shear link reached 1.66.The shear link had an plastic rotation of exceeded 0.17 rad,which is larger than the limit value of the plastic rotation Angle of 0.08rad stipulated in ANSI/AISC 341-16.The maximum acceptable residual story driftsθre that allow for easy replacement of the shear links was 0.41%.Besides,the stiffness and carrying capacity of the structure and the force transfer performance of the joints were not affected after the shear link was replaced.The damage is concentrated in the shear link,while the rest of the members remain basically elastic.The simplified numerical model of HSS-SFT-RSL structure based on the Open Sees was developed in which the shear link was simulated by two node link element and the columns and deep beams were simulated by the force-based beam-column element.The simulation results agree well with the experimental results.Three simplified numerical models of HSS-SFT-RSL structure with different effects of layout of shear links were developde,and the dynamic time-history analysis were performed.The analysis results indicated that:（1）the plastic deformation of the HSS-SFT-RSL mainly concentrated on the shear link,the ideal yield order can be achieved.（2）HSS-SFT-RSL can meets the deformation requirement under earthquake action.（3）Under the premise that the cross section size of the members was the same,that is,the amount of steel used,the use of high-strength steel can effectively reduce the stress level of the members.（4）The residual inter-story deformation of post-earthquake of the structure is between 0.028%and 0.148%after severe earthquake,the shear links could be replaced and HSS-SFT-RSL had good post-earthquake replaceability.（5）Considering the seismic performance and repairability of the structure,it was suggested that the shear links of HSS-SFT-RSL structure should be arranged in three-span interval. |
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