Abstract
Semi-continuous construction of braced frames is known to result in significant savings in frame weight. To be attractive to designers though, calculation methods need to be straightforward and savings are required in overall frame cost, not just weight. This chapter describes the advantages of plastic design using partial-strength joints. This approach is used in comparisons with simple design, resulting in average cost savings for planar frames of approximately 5.5%. Such savings are worthwhile in comparison with other opportunities available for reductions in the cost of fabricated steelwork. Steel frames for buildings have usually been designed on the basis that beam-to-column joints are either pinned or rigid. The actual stiffness though will often fall between these extremes, giving what is generally termed “semi-rigid” behavior.
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