The Development of A Structural Analysis Computer System Using Computer Graphics

本研究的成果如下。研究了适用于结构分析仿真的计算机支持的图形显示方法。研究结果表明，扫描线算法、z -缓冲区法、a -缓冲区法、图层跟踪法和映射法等实景图像制作方法是可行的。这两种方法对于结构分析模拟水平都过高，计算时间长。因此，决定使用以线条为中心的渐变，以显示结构分析仿真。钢筋混凝土框架结构弹塑性分析得到的应力分布图和变形图可以用彩色图形显示。使用该系统可以立即表示任何部分的应力，从而可以很容易地掌握塑性区随变形增加而扩大的情况和力的重新分布。开发了一个系统，以提供应力分布和变形程度的彩色图形显示，从地震反应的分析或大跨度桁架空间结构，考虑到每个成员的屈曲。该系统可以显示大跨度桁架空间结构在任意时刻的受力分布和变形状态，虽然多构件多自由度大跨度空间桁架结构的受力情况比较复杂，但其彩色图形显示的可视化方式对于掌握这种情况下的受力状态和变形模式是非常有效的。采用有限元法对系统桁架中使用的螺栓进行了分析，开发了一个能够提供应力分布和变形的彩色图形显示系统，从而便于掌握力的流动，以及法向应力分布及其变形图的分级显示。少

The achievements of this study are described below.1, Computer-supported, graphic display methods suitable for structural analysis simulation were investigated. The investigation findings indicate the availability of real image production methods such as Scan-line algorithm method, Z-buffer method, A-buffer method, Lay-tracing method and Mapping method etc. Either of these methods is excessively high level for structural analysis simulation and requires long calculation time. Due to this, decision was made to use the gradation centering on linework, in order to display structural analysis simulation.2. The stress distribution diagrams and the deformation diagrams derived from the elasto-plastic analysis of a reinforced concrete framed structure could be displayed in colored graphics. The use of this system allows the immediate representation of stress in any portion, so that the condition of the expanding plastic zone with increasing deformation, and the redistribution of forces be gra … More sped very easily.3. A system was developed to provide a colored graphic display of the distribution of stresses and the degree of deformation, derived from the analysis of the earthquake response or a long-span truss space structure with consideration given to the buckling of each member. This system can display the distribution of stresses and state of deformation at an arbitrary hour derived from the dynamic behavior of a long-span truss space structures, Although the behavior of the long-span space truss structure with many members and the degree of multiple freedom is complex, its visualization in terms of a colored graphic display was very effective to grasp the state of stresses and the mode or deformation under such a condition.4. Following analysis of bolts used in the system truss by the finite element method, a system capable of providing the colored graphic display of stress distribution and deformation was developed, thereby facilitating an easy grasp of the flow of forces, along with the gradation display of the distribution of normal stresses and its deformation diagrams. Less