Heavy industrial steel buildings are mainly constructed with trussed or grid roof system instead of tapered beam roof system,which has never been adopted in such constructions in China.

The results of the cyclic loads test show that the welded-cover-plates steel frame rigid joint has good ductile performance and plastic hinge could appear in the expectant place.

Elastic stability analysis of tapered beam with I-section;

The displacement mode of a tapered beam is derived according to the tapered members with I sections used very often for steel structures, on the basis of which corresponding shape function and stiffness matrix are obtained by finite element theory and a symbolic software.

In this paper, the equilibrium differential equation including the effects of constant axial force and shear deformation was established for tapered beams.

Tapered beams are widely used in steel structures, especially in portal frames.