A new nonlinear finite element model which applies subsystem connect beams element and space degenerate shell element to analyze eccentric braced structural energy - dissipation and links collapse mechanism is presented in this paper 本文提出了应用子结构法联合梁单元与空间退化曲壳单元分析偏心支撑钢框架耗能性能及耗能梁段破坏机理的非线性有限元分析模型。