Abstract
The widespread acceptance of cold‐formed structural steel members as roof purlins in conventionally engineered building has been hindered by the lack of a useful and efficient analysis and design methodology. This article outlines a microcomputer‐based design methodology for roof Zpurlins, the purpose of which is to provide such a tool. The design methodology details used in the development of the interactive microcomputer program Z‐BM are described herein, along with a general program description and a sample program execution. Z‐BM is based on the American Iron and Steel Institute specifications and considers the combined effect of the Z‐purlin and corrugated roof deck in resisting applied loads. In addition to echoing all input data, for each loading combination, Z‐BM provides a complete stress summary, the maximum allowable axial load, plus the maximum deflection and its location.
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