SCI P183: Design of Semi-continuous Braced Frames

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SCI P183: Design of Semi-continuous Braced Frames

Author: G H Couchman | Size: 1.5 MB | Format: PDF | Publisher: SCI | Year: 1997 | pages: 72 | ISBN: 1859420591

In a semi-continuous frame the degree of continuity between the beams and columns is greater than that assumed in simple design, but less than that assumed in continuous design. The degree of continuity can be chosen to produce the most economic balance between the primary benefits associated with these two traditional alternatives.
This document presents a method of analysis and design which permits semi-continuous braced steel frames to be designed by hand. The method is only marginally more complex than that for simple design, and the connection details are straightforward (and therefore inexpensive). Connection forces and moments can be chosen so that column stiffening is not required. Despite this economy of both design effort and fabrication costs, when compared with simple design, it is possible to achieve:
- reduced beam depths
- reduced beam weights.
Procedures are given for checks at both the ultimate and serviceability limit states. For normal design the practising engineer need only consult the main body of the document and the standard connection capacity tables given in Appendix C (yellow pages). A worked example of the approach is included in Appendix A. Appendix B gives a full procedure for estimating deflections more accurately, should this be required.

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