Stability Analysis Of The Lace-barred Lattice Column With Damages

Now, Steel structure has been widely applied in various building structure. More and more High-level and multi-storey residential, office building and light steel industrial plants are using steel to construct the main structure. Especially the built-up structural system composed of bar in the steel structure represent a growing proportion. Because the built-up steel column has greater section radius of gyration,it has been widely used in main structure. For example, the top chord of bridges, double component column of industrial plants,minus of crane and radio mast and so on. The built-up steel column makes bars light weight, and reduces the amount of steel. Achieving greater economic effect.Although strict design calculations are made to guarantee the members have sufficient stability in their work life, yet loads may damage them during construction and in service. These damage include initial bending, initial eccentric, residual stress and direct damages of members. All these forms of damages will cause the depressing of the member's load carring capacity as well as the whole structure's load carrying capacity and service life. The capacity and condition of some members of the structure will change apparently because of the damages. This article studies simple solid-web steel columns ,which are widely used in general steel structures and the changing of their ultimate bearing capacity as well as stability qualities under initial infects and general damaged conditions. And then , introduce the conclusion from the solid-web steel columns into the built-up steel columns, Studing the changing of their ultimate bearing capacity as well as stability qualities under initial infects and general damaged conditions.