To study dynamic effect resulted from the initial damage of the structure during progressive collapse, instantaneously applied load method was adopted to perform dynamic response analysis of a single-story steel plane frame with the failed middle column by a simplified model and frame element model respectively.

To study the progressive collapse process of structures,a method to apply instantaneous load was adopted to simulate the progressive collapse of a multi-story plane steel frame with a failed middle column at the first story by using the large deformation and dynamic finite element software LS-DYNA.

In this paper the behavior of single-deck steel frame under constant load under fire is mainly tested.

The reliability-based integrated design(RID) method and design formula of steel frames are established on the basis of the ultimate load-carrying capacity analysis and system reliability assessment of planar steel frames.

Dynamic stability analysis of single-story frame structures is analyzed based upon the finite element method, the influence of different earthquake motion on dynamic stability of single-story frame is studied.