It represents the bar component of mixed door rigid frame and mixed door rigid frame with level torsion bars,gives the inner force graph of the bars of them in the action of loading,compares the technical and economical index of the two kinds of door rigid frame,and illustrates the optimum and reasonability of the after,and this can be the reference to the designers.

Discussion of the Properties of semi-rigid nodes in portal frame;

The review and prospect of cold-formed steel portal frames;

Comparison of deforming behavior in nonlinear and linear of portal frame with tapered members;

Discussion of Problems in Portal Rigid Frame Design;

The problems should be noticed in the design of steel structures of light building with portal rigid frame;

Elastica gllobal buckling analysis of portal rigid frames with small height-span ratio;

Optimization design of steel portal frames based on genetic algorithms;

From the selection of column grid, using tapered member, plastic design and other aspects practical technical measures are presented for optimal design of steel portal frame.

Based on the regularity of the foundation movement deformation over the abandoned mine goaf,a numerical model of the steel portal frame is set up.