The Development of A Structural Analysis Computer System Using Computer Graphics

研究成果如下：1.研究了适合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-Buffer方法、A-Buffer方法、Lay-Tracing方法和映射方法等实景图像生成方法是可行的，但这两种方法对结构分析模拟的水平都太高，计算时间较长。鉴于此，决定使用以线条为中心的渐变，以显示结构分析模拟。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。该系统的使用允许立即表示任何部分的应力，因此随着变形的增加而扩展塑性区的条件和力的重新分配是Gra…更快的速度非常容易。通过对大跨度桁架空间结构进行地震响应分析，并考虑各构件的屈曲，开发了一个彩色图形显示应力分布和变形程度的系统。该系统可以显示大跨度网架空间结构动力行为所衍生的任意时刻的应力分布和变形状态，虽然大跨度网架结构具有多杆件、多自由度的复杂行为，但其彩色图形显示对于掌握这种情况下的应力状态和振型或变形是非常有效的。通过对体系桁架中螺栓的有限元分析，开发了一套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，以及法向应力分布和变形图的分级显示。较少

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