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.

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.

Crack identification of plane frames based on wavelet transform of angle displacement mode;

By using excel,the electronic form of a plane frame under vertical load is established.

The plane frame is calculated under horizontal load-wind and earthquake by using ANSYS finite element analysis software.

The line rigidity transferring relation between the single span planar frame and the fishbone-shaped vibration model is presented.

This paper presented an accurate method of calculating the earthquake force design sensitivity and Hessian matrix of the planar frame.

By giving constraint types of each member in planar frame, the buckling sequence of members is calculated with the application of ANSYS V8.

Analysis of concrete filled steel tubular frames by using different modulus;