Structure Optimization Design Of The Truss Between The Two High Towers

Truss structure has the advantages of simple and efficient, light weight and making full use of the mechanical properties of materials, so it has been widely applied not only in the occasions which need to cover a large span, such as marine engineering, bridge engineering and so on, but also increasingly widespread used in industrial and civil construction.The application of truss structure in our country became more and more.The idea of the finite element analysis method, the theoretical principles and the analysis process were first introduced in this paper. Tower-truss ANSYS model was built. According to the architectural design specifications provided by the Institute of Civil Engineering and the specific values of each LED display to withstand wind load, the analysis of the tower-truss was executed,it totally contained of six conditions that gravity, gravity+wind load once-in-ten-years, gravity+wind load once-in-a-century, gravity+temperature, gravity+temperature+wind load once-in-ten-years and gravity+temperature+wind load once-in-a-century. After then the deformation maps was extracted, the maximum deformation volume and maximum deformation position in six conditions was counted and the results was analyzed. Eventually concluded that the amount of deformation of the truss is able to meet the requirements if neglect the temperature conditions but not meet the requirements if impose the temperature conditions, so the temperature effects can’t be ignored.As the main load-bearing structure, the truss structure has to complete action of the first lift once a day, the frequency is very high. So the tower-truss, truss-rail’s modal analysis were made to observe their natural frequency.At the same time it provides the basis for the design and control of the drive components and avoids resonance in the dynamic process of synchronous rise and fall, which may result in accidents or reduce the service life of equipment and building structures. And tower-truss structure for multi-earthquake response spectrum analysis results showed that:the main layer of the concrete structure displacement angle is less than the norms prescribed limits so it can meet the specification requirements.On the basis of the static analysis of the truss structure, the maximum deformation of the truss as the optimization objective, the truss tube cross-section diameter and thickness as design variables, taking the total mass of the20truss and the maximum deformation on the1st truss as state function, the truss structure optimization design was carried out by the ANSYS Design Opt modules and the optimal solution was obtained. After the optimization, the deformation of the optimized truss decreases from166.65mm to136.67mm, reduced by17.99%. It has achieved a significant optimization results and can meet the design specifications. The quality is equivalent to the initial design does not increase the economic costs.