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JIGFEX是一个用于结构分析和综合的大型通用性程序系统。文中简要地介绍了为系统设计而研制的“结构化FORTRAN”语言(DITSF)和内存管理系统JINEGS,以及为适应大型组合结构模型化而要求系统具备的一些主要功能,着重介绍了系统中处理包括节点位移间主从关系约束在内的各种结构约束的特点。在多级子结构分析中,JIGFEX中提出并实现了能平行调用的子结构模式和荷载模式的概念,进一步利用结构在群论意义上的广义对称性,大大减少每个子结构模式凝聚过程的计算工作量。 JIGFEX应用迁移式子空间迭代法分析结构自由振动。在动力分析中引入节点主从关系,其降低结构自由度数的意义,比静力分析中更为重大。 JIGFEX作为结构分析程序系统,已接入结构优化系统DDDU。JIGFEX已用于分析高层建筑、直线粒子加速器、气垫船等一系列大型工程结构,并取得了很好的效果。
JIGFEX is a large general-purpose program system for structural analysis and synthesis. This article briefly introduces the “structured FORTRAN” language (DITSF) and memory management system JINEGS developed for system design, and some of the main functions required for the system to meet the requirements of large-scale composite structure modeling. It focuses on the processing in the system. The characteristics of various structural constraints, including the constraint of the master-slave relationship between node displacements. In the analysis of multi-level substructures, JIGFEX proposes and implements the concepts of sub-structure modes and load modes that can be invoked in parallel, and further uses the generalized symmetry of structures in the sense of group theory to greatly reduce the computation of the aggregation process of each sub-structure mode. Workload. JIGFEX employs a transition subspace iteration method to analyze structural free vibration. The introduction of node-master-slave relationship in dynamic analysis reduces the significance of structural degrees of freedom more than static analysis. As a structural analysis program system, JIGFEX has accessed the structural optimization system DDDU. JIGFEX has been used to analyze a series of large-scale engineering structures such as high-rise buildings, linear particle accelerators, and hovercrafts, and has achieved very good results.