Research Of Optimization On Types Of750kV Substation Truss Structures

To get optimal scheme of different types of750kV substation truss structures, the mechanical properties and the amount of steel of different types and mechanical properties and the amount of steel of a same type have been analyzed and compared. The types of substation truss structure mainly include ordinary steel lattice truss structure, ordinary steel herringbone column truss structure, high-strength steel lattice truss structure, high-strength steel herringbone column truss structure and concrete filled steel tube herringbone column truss structure. Ordinary steel herringbone column truss structure include6m-root size,7m-root size,8m-root size and9m-root size. Lattice truss structure and7m-root size herringbone column truss structure have been calculated and analyzed by Q420, Q460, Q500and Q55O.6m-root size,7m-root size and8m-root size concrete filled steel tube herringbone column truss structure have been calculated and analyzed. On the premise of meeting the bearing capacity limit state and the serviceability limit state. The amount of steel of different types of substation truss structures has been counted to find out the saving types. Compared with lattice truss structure, less steel is consumed in herringbone column truss structures. The steel consumed in8m-root size herringbone column truss structure consumes is less than those in6m-root size herringbone column truss structure and7m-root size herringbone column truss structure.In the condition of two limit states, substation truss structures were in the linear elastic work status under the wind condition and the design earthquake condition. In order to study the mechanical property under strong earthquake, the vibration mode, period, maximum stress and displacement of8m-root size ordinary steel herringbone column truss structure has been analyzed. Finally,8m-root size ordinary steel herringbone column truss structure has been analyzed by pushover to study its elastic-plastic characteristics and the process of development of plastic hinges. Then the elastic limit displacement of the monitoring point corresponding to the first plastic hinge appears has also been determined to study its working condition.