A Study of the Precision of Optimum Design Using Suboptimization

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by Yasunori Konishi, Nagasaki Univ, Japan,
Kazuo Takahashi, Nagasaki Univ, Japan,
Hiroshi Ryu, Nagasaki Univ, Japan,

Document Type: Proceeding Paper

Part of: Computer Utilization in Structural Engineering

Abstract: As the scale of structures becomes larger and their configuration become more complicated, the design variables and constraint conditions increase, and numerical calculation of the optimum design becomes more difficult. Therefore, it is necessary to follow an optimum design using suboptimization. One of the authors has already presented the results for the optimum design of trusses using this method. By using this method for a statically determinate structure, the results perfectly match those obtained by the standard method. But, for statically determinate structures subject to displacement constraints or for statically indeterminate structures, as changes on the section affect those in internal stress or displacement, the results may not perfectly match those by the standard method. In this study the authors have tried to compare the precision in optimum values and objective functions with theoretical values in two examples by using this method and the SLP method.

Subject Headings: Trusses | Structural design | Displacement (mechanics) | Stress analysis | Numerical methods | Comparative studies | Mathematics |

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