Application of PC Graphics, CADD, and Solid Modeling Techniques to 3-D Structural Stability of Concrete Monolithic Structuresby Fred T. Tracy, US Army Engineer Waterways, Experiment Station, Vicksburg, United States,
Matt E. Hale, US Army Engineer Waterways, Experiment Station, Vicksburg, United States,
Abstract: A computer program for computing 3-D overturning and sliding stability (3DSAD) of concrete monolithic structures has been written and is widely used. This paper describes recent advances in its capability with specific emphasis on graphics, solid modeling, and CADD. 3DSAD models geometry and loads by using simple solid modeling techniques. This paper first describes techniques in linking engineering programs such as 3DSAD with other more graphically intensive programs such as Intergraph's computer aided design and drafting (CADD) Engineering Modeling System (EMS) and their MicroStation software. Next, the paper shows how displaying 3-D geometry as shaded solids and 3-D loads as translucent objects that once could only be done with special PC solid modeling graphics boards can now be effectively emulated in software, thus requiring only a standard EGA or VGA PC. Finally, the paper presents a simple hidden surface algorithm for the PC that includes hidden line and 50% translucency capability.
Subject Headings: Computer aided design | Concrete structures | Structural stability | Solid mechanics | Computer models | Graphic methods | Three-dimensional models
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