โ Scribed by Fred I. Stahl; Richard N. Wright; Steven J. Fenves; James R. Harris
No coin nor oath required. For personal study only.
This article discusses a set of techniques for expressing and organizing the contents of building design standards, and suggests that application of these techniques, in conjunction with a restructuring of data flow strategies within CABD (computer-aided building design) software systems, are needed to reduce the effort and cost required to maintain CABD systems applicable and current. The article stresses application of these techniques to analysing the clarity, consistency, and completeness of existing building design standards, and to developing new standards. The SASE (Standards Analysis, Synthesis, and Expression) software system, a convenient implementation of the techniques, is presented. The method of use of standards represented by these techniques within a CABD environment Is discussed as are Implications of the logical expression of standards for constructing expert systems for the building process.
CAD is fast becoming the ordinary method used for engineering design, as evidenced by rapid developments in the electronics, aircraft, and automotive industries. However, building construction is a sector of the economy in which most of the potential increase in productivity from the computer technology has not yet been realized I . Significant among the many factors causing this lag are the diversity of codes and standards governing building design and construction, and the frequency with which these regulations change. These points have particular consequences for CABD software systems. In practice, the high cost of software maintenance may thwart substantially users' attempts to maintain software that is both broadly applicable across various regulatory jurisdictions as well as current.
The applicability and currency of CABD software systems in widespread use today are costly to maintain chiefly because provisions of standards against which design decisions must be checked are 'hard coded' into the systems' component selection and proportioning routines. This applies particularly to those intended for structural engineering design. Thus, the alteration of even a single provision
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