6 piece of building models were designed for studying the multi buckling restrained braced steel frame in this paper.The main parameters in the study included the frame strength and the level participation ratio β.Second-order nonlinear analyses for 6 pieces of building models are conducted based on plastic hinge theory,and evaluate formula was given based on energy and story displacement.Comparisons between static and dynamic elastic-plastic analysis results were conducted in these models.The parametric analysis was performed on story displacement,shear,the energy distribution of buckling restrained brace and the relationship of hysteretic curve.The results revealed that the static analysis responses of story displacement,shear,the energy distribution of buckling restrained brace and the relationship of hysteretic curve are in agreement with the dynamic when the frame strength is 0.3 or 0.5 and the level participation ratioβ between 30％ and 60％.So the static analysis value can evaluate the value of seismic response.%以典型的对称屈曲约束斜撑钢框架为主要研究对象,斜撑框架强度CB以及屈曲约束斜撑的水平力分担率β为主要研究参数,通过二阶非线性静动力分析,对各模型的层间变形、层间力以及塑性能量分布等进行了比较研究.考察了各模型各层的层间位移、层剪力、屈曲约束斜撑的塑性能量分布以及层滞回曲线关系等.结果表明:屈曲约束斜撑水平力分担率β≈30％～ 60％时,各模型各层的层间静、动力分析结果基本吻合.
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