Research progress of cold-formed steel structure

 Cold-formed steel members have the advantages of light weight, high strength, easy prefabrication and mass production, fast installation and recyclable. The cold-formed steel structure system is mainly composed of wall system, floor system and roof system. Through theoretical analysis and experimental research, the cold-formed steel structural system is studied in depth. 

The research direction covers the mechanical performance of cold-formed thin-wall steel basic members and composite members, the lateral resistance performance of composite walls, the bearing capacity, stiffness and comfort of composite floors, and the seismic performance of the whole building. The relevant research results are as follows: 1) The half-energy method is used to deeply study the related effects of plate group buckling, and the design method of effective width to thickness ratio of edge stiffened plates is established; The failure characteristics and mechanical properties of cold-formed thin-wall steel axial compression columns are revealed, and a unified analysis method for the buckling critical load of simply supported and steady-supported axial compression columns is established. 2) The failure characteristics and mechanical mechanism of double-limb split cold-formed thin-wall steel axial compression column and bending beam are revealed, and a simplified calculation method of ultimate bearing capacity of cold-formed thin-wall steel split section column and beam is proposed. 3) The mechanical mechanism, failure mode and mechanical properties of traditional cold-formed thin-wall steel composite wall and cold-formed thin-wall steel-plate shear wall under horizontal load are revealed, and the theoretical analysis method of cold-formed thin-wall steel composite wall is established. 4) The mechanical mechanism, failure mode and mechanical properties of cold-formed thin-wall steel composite floor under vertical load, horizontal load and vibration excitation are revealed, and the design calculation method of cold-formed thin-wall steel composite floor is proposed. 5) The failure characteristics, dynamic characteristics and seismic response of cold-formed thin-wall steel residential buildings under seismic loads are revealed, and the finite element analysis method of low and multi-layer cold-formed thin-wall steel structural system is established. 6) The mechanical mechanism, failure mode and mechanical properties of cold-formed thin-wall steel split section columns under fire were revealed, and theoretical analysis methods, simplified mechanical models and design calculation theories were established.