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通过对不同体系超大跨度空间结构研究成果的回顾,探讨了其发展趋势。对比分析了800 m跨度、相同荷载作用下具有相同几何参数的双层网壳、局部三层网壳、肋环型巨型网格和凯威特型巨型网格结构体系的多项静力性能指标。结果表明:在相同跨度和荷载作用下凯威特型巨型网格结构体系受力性能最优。针对此结构体系的空间复杂性,利用CAD三维成型分析获得其拓扑关系,明确了跨度、矢高、桁架高度等7个几何形体控制参数。基于结构几何成型的程序化实现方法,利用APDL参数化语言首次得到其自动生成程序,并编程完成了结构分析计算。最后对凯威特型巨型网格结构体系展开了包括环(径)向分割份数、矢跨比、桁架高跨比在内的7个参数共计153个模型、1 000余算例的大规模参数分析。总结了结构力学性能随上述参数的变化规律,归纳了各参数的合理取值范围,为该巨型结构的理论研究与工程设计提供参考。
Through the review of the research results of the large-span spatial structure of different systems, the development trend is discussed. A series of static performance indexes of double-layer reticulated shell, local three-layer reticulated shell, rib-ring giant grid and Kweit-type giant grid structure system under the same load under the same load were compared and analyzed. . The results show that under the same span and load, the Kweite giant mega-grid structure has the best mechanical performance. According to the spatial complexity of this structural system, topological relations were obtained by CAD three-dimensional modeling analysis, and seven geometric control parameters such as span, pitch height and truss height were defined. Based on the procedural realization method of structural geometric modeling, the program of APDL parametric language was used to generate its automatic generation program for the first time, and the structural analysis and calculation were completed. Finally, a total of 153 models including seven parameters including ring (diameter) to split fraction, ratio of cross-over and ratio of truss to span were developed for the Kaiweite giant mega grid structure system. A total of more than 1,000 cases Parameter analysis. Summarizes the changes of structural mechanics performance with the above parameters, induces the reasonable range of each parameter and provides a reference for the theoretical research and engineering design of this giant structure.