A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A Knowledge-Based Expert System for Optimal Structural Design
Abstract This lecture concerns the development of a knowledge-based expert system for the computer-automated least-weight design of structural steel frameworks subject to design code criteria and commonly used rules of design practise. The expert system is implemented for steel design standards and utilizes corresponding databases of commerically available standard steel sections. The numeric-based tasks of design are implemented in FORTRAN routines ; these include first and second-order structural analysis, sensitivity analysis, optimization and design verification. The knowledge-based tasks of design are implemented in rules and procedures encoded in an artificial intelligence language, OPS83. A knowledge base of rules controls the overall design synthesis process, which is organized into three stages; Preliminary, Solution and Critique. For fixed structure topology and known loads, the Preliminary stage determines material properties, section profile, fabrication group and an initial section size for each member of the structure. The Solution stage involves an iterative design process that controls the execution of FORTRAN routines until convergence to a reasonable least-weight design of the structure occurs. The Critique stage assesses the results of the Solution stage and suggests possible design improvements, if any, based on rules of good practise commonly employed by experienced designers; the Solution stage is then re-activated with the suggested changes implemented, or the results of the final design are printed if no improvements are considered. The lecture commences with the FORTRAN-based software system presented by the writer in a previous lecture of the NATO-ASI, and first deals with the issues of concern in converting a FORTRAN program to a knowledge-based expert system program. Then, the issues involved in developing the expert system itself are addressed at the three stages of the design process noted in the foregoing: Preliminary, Solution and Critique. Finally, the expert system is applied for a number of design examples to illustrate its capability to design structural steel frameworks of the type encountered in professional practise.
A Knowledge-Based Expert System for Optimal Structural Design
Abstract This lecture concerns the development of a knowledge-based expert system for the computer-automated least-weight design of structural steel frameworks subject to design code criteria and commonly used rules of design practise. The expert system is implemented for steel design standards and utilizes corresponding databases of commerically available standard steel sections. The numeric-based tasks of design are implemented in FORTRAN routines ; these include first and second-order structural analysis, sensitivity analysis, optimization and design verification. The knowledge-based tasks of design are implemented in rules and procedures encoded in an artificial intelligence language, OPS83. A knowledge base of rules controls the overall design synthesis process, which is organized into three stages; Preliminary, Solution and Critique. For fixed structure topology and known loads, the Preliminary stage determines material properties, section profile, fabrication group and an initial section size for each member of the structure. The Solution stage involves an iterative design process that controls the execution of FORTRAN routines until convergence to a reasonable least-weight design of the structure occurs. The Critique stage assesses the results of the Solution stage and suggests possible design improvements, if any, based on rules of good practise commonly employed by experienced designers; the Solution stage is then re-activated with the suggested changes implemented, or the results of the final design are printed if no improvements are considered. The lecture commences with the FORTRAN-based software system presented by the writer in a previous lecture of the NATO-ASI, and first deals with the issues of concern in converting a FORTRAN program to a knowledge-based expert system program. Then, the issues involved in developing the expert system itself are addressed at the three stages of the design process noted in the foregoing: Preliminary, Solution and Critique. Finally, the expert system is applied for a number of design examples to illustrate its capability to design structural steel frameworks of the type encountered in professional practise.
A Knowledge-Based Expert System for Optimal Structural Design
Grierson, Donald E. (author)
1992-01-01
44 pages
Article/Chapter (Book)
Electronic Resource
English
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