| Space steel truss structure is widely used in practical engineering. because of its simple and variable forms, good economic indicators and mechanical characteristics. In recent decades, with the development of the large Olympic Games, Expo and other major national social and economic activities, this kind of structure is widely used in stadiums, conference venues and airport station and other public buildings. Therefore, it is very important to design a safe and economic structure for the space steel truss structure. The traditional structure design mainly depends on the designer’s experience level, an optimal design scheme, which is usually selected by multiple schemes comparison. The theory and method of structural optimization design are more mature at present, but also relatively backward in the civil engineering practical application. In this paper, a stadium awning with steel truss structure as the research object, using finite element software ANSYS to optimize research and analysis, in order to achieve optimal design. The main contents are as follows:(1)Establish two three-dimensional model of the stadium awning with steel truss structure by 3D3S12.1 steel structure design software and ANSYS12.0 finite element analysis software. The internal force calculation and analysis are carried out considering various load conditions, in order to understand the mechanical characteristics and deformation characteristics of the stadium awning. Canopy structure is characterized by the force the greater the closer at the support member forces, the deformation is characterized by the maximum vertical displacement of the cantilever end. While, the rationality and feasibility of using ANSYS software to optimize the size of the structure is verified by comparing the results.(2)Under the most unfavorable load condition, change the truss geometry to establish different single truss finite element models, and establish the finite element model of the whole tent which is corresponded to the single truss steel consumption volume at least. Study on the influence of bearing capacity and economic performance over the geometric parameters. Concluded that the H variation of the height of the cantilever end section has a significant influence on the overall stiffness of the truss, the B change of the width of the truss section and the length of the section of the S has a significant influence on the steel consumption of the truss and the cross section height ratio m has little influence on the load-carrying capacity of the structure, but it is of great significance in the optimization of the cantilever structure. And give the design of recommended values of dimensionless parameters B/H,S/B,H/L and m which is similar to the variable section cantilever structure of this paper.(3)Based on the APDL language, further section optimization to determine the final optimized structure design of tent through the optimized design module of ANSYS. Verify the optimization results by comparing the optimizing design results with the original design results. The final design saves 20.1% sheet steel than the original design, achieved good economic benefits.(4)Take the before and after optimization scheme of the cantilever tuss as models, observe the calculation of natural frequencies and vibration modes. And study the dynamic time history analysis of the structure under the action of EL-Centro seismic waves, in order to compare the seismic performance of the structure before and after optimization. Concluded that the vertical layout of the stadium awning with steel truss structure is reasonable. It did not cause a significant impact on the seismic performance of optimized awning after optimization. The rationality of the optimization is verified, and the purpose of the optimization design is achieved. |
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