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在索网形状优化、找形和初始预应力确定的基础上,建立以结构质量最轻为目标函数,下弦索截面、上弦梁截面和撑杆等次要构件截面分级优化的双向张弦梁结构优化设计模型,该模型考虑结构应力约束、局部稳定约束和位移约束条件,并通过ANSYS优化模块和APDL语言编制相应程序,提出双向张弦梁结构优化设计的两步三级算法。算例表明,所提出的优化设计方法不仅可以满足工程设计需要,而且可以较快地收敛到满意的优化结果,可方便地用于工程的初步设计。
Based on the shape optimization, shape finding and initial prestressing, the optimization design of biaxial chord beam structure based on the hierarchical optimization of the cross section of the secondary members with the lightest structural mass as the objective function, the lower chord section, the winding beam section and the strut is established. The model considers the structural stress constraints, the local stability constraints and the displacement constraints. The ANSYS optimization module and the APDL language are used to compile the corresponding programs. A two-level and three-level algorithm is proposed to optimize the structure of the bidirectional beam string structure. The example shows that the proposed optimization method can not only meet the needs of engineering design, but also converge to satisfactory results quickly and can be easily used in the preliminary design of the project.