Civil Engineering Association

SCI P 264 Wind-moment Design of Unbraced Composite Frames

This publication presents procedures for the design of wind-moment composite frames in accordance with BS 5950-1 and BS 59550-3. In this method of design, the frame is made statically determinate by treating the connections as pinned under vertical loads and fixed under horizontal loads (with certain assumed points of zero moment). The publication gives design procedures for frames (with composite beams, slabs and connections) that are braced in the minor axis direction. The limitations of the method are explained. In particular, it should be noted that the method is only recommended for low-rise frames up to four storeys high. In addition to design procedures for the ultimate and serviceability limit states, fully worked design example is presented. The publication also reproduces the resistance tables for standard wind-moment composite connections taken from SCI/BCSA publication Joints in steel construction: Composite connections. These connections use steel reinforcement, flush end plates and grade 8.8 M20 or M24 bolts, and achieve sufficient rotation capacity by ensuring that the moment resistance is not governed by local concrete crushing or bolt or weld failure.

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