Thesis

Plastic design of steel structures

This report presents the basic concepts, design procedures and an example as applied to a twelve-story building. Mild steel is used extensively as a structural member. This material has the property of supporting loads beyond its elastic limit until it reaches its ultimate load through plastic deformation. Therefore plastic design provides a rational method of designing structural members. Plastic design is easier (or at least not more difficult) to follow compared to the conventional design method. As this method saves the material by weight, it is more economical. In this example, the floor girders designed by the plastic method save 43.4 percent by weight when compared with the working load design.

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