屈曲约束支撑屈服后刚度比影响因素分析及计算方法OA

Based on theoretical calculation formulas for the stiffness of buckling-restrained braces alongside existing experimental data,the primary factors affecting the post-yield stiffness ratio of buckling-restrained braces were identified.A test specimen of buckling-restrained brace with cross-sectional core plate was designed,and its hysteretic behavior was elucidated through experiment.The finite element model was subsequently validated against the test results.The impact of core plate material and the axial stiffness ratio between the core plate elastic segment and yielding segment on the post-yield stiffness of buckling-restrained braces were systematically examined through finite element analysis.The analytical results demonstrated that the material of the core plate have a substantial influence on the post-yield stiffness ratio of buckling-restrained brace.The post-yield stiffness ratio increases with the increase of elastic segment length and section area.And changing the length of the elastic segment has a greater impact on the post-yield stiffness ratio.Through comprehensive parameter analysis,predictive formulas have been derived for calculating the post-yield stiffness ratio of buckling-restrained braces with various core plate materials.These formulas are intended to aid engineering designers in their calculations and design processes.