中文摘要：

采用集中塑性铰模型模拟构件的材料非线性特征，建立平面钢框架结构的非线性倒塌模型，对某平面钢框结构分别进行了线弹性及非线性的连续倒塌分析，并将两者的计算结果进行了比较．结果表明，线弹性分析可以利用Dc指标判定结构中的最薄弱部位，非线性方法可得到坍塌时结构的所有破坏部位，并可确定最终的坍塌破坏范围．

英文摘要：

The plastic hinge model was adopted to represent the inelastic behavior of structural components, and based on the alternate load path method, a finite element model for non-linear progressive collapse analysis of steel frame structure was set up. The linear and non-linear progressive collapse analysis procedures were carried out for comparison. It is shown that the linear analysis can provide the decision for the weakest part of the structure with Dc index, the non-linear analysis can obtain all the damaged locations, and determine the ultimate collapse region.