Evaluation of Seismic Parameters for High‐Strength Steel Frame‐Tube Structure With Double‐Channel Shear Link

To address the insufficient seismic performance of conventional steel frame‐tube structures, a novel High‐Strength Steel Frame‐Tube Structure with Double‐Channel Shear Link (HSS‐FTS‐DCSL) is proposed by introducing replaceable double‐channel shear links made of Q235 steel at the center of deep beams, while all other structural components are constructed with Q460 high‐strength steel. The earthquake input energy is dissipated through the shear yielding of these replaceable links. Benefiting from the use of high‐strength steel, the remaining components remain elastic or develop only limited plastic deformation, thereby significantly enhancing the seismic performance of traditional frame‐tube systems. To investigate the Response Modification Factor ( R ) and Displacement Amplification Factor ( C d ) of the HSS‐FTS‐DCSL, a total of eight structural models were designed in three groups, considering variations in the number of floors, the length of the shear links, and their layout patterns. The R ‐factor and C d ‐factor values of all HSS‐FTS‐DCSL models were evaluated using the Distributed Lateral Force Adjustment Method and an Improved Capacity Spectrum Method that account for higher‐mode effects. Furthermore, the influence of the number of floors, shear link length, and shear link layout on R‐factor and Cd‐factor was analyzed. Based on the results, recommended values of 3.858 for R‐factor and 6.584 for Cd‐factor were proposed, while the corresponding ductility reduction factor R μ and overstrength reduction factor R Ω = R / R μ were 1.166 and 3.309, respectively. Based on the proposed R ‐factor for the HSS‐FTS‐DCSL, the code‐based design spectrum was adjusted accordingly. A representative HSS‐FTS‐DCSL model was then re‐designed, and a comparative analysis of its seismic performance and steel consumption before and after redesign was conducted to validate the rationality and effectiveness of the proposed performance coefficients.