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This material is copyright - all rights reserved. Reproduced under licence from The Steel Construction Institute on 12/2/2007 To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.org/ Steel Designers' Manual - 6th Edition (2003) • The system is adjustable if building modifications are required in the future • Bracing can be arranged to accommodate doors and openings for services • Bracing members can be concealed in partition walls • They provide an efficient bracing system. A disadvantage is: • Diagonal members with fire proofing can take up considerable space. Fig. 2.31 Connections: (a) simple; (b) continuous; (c) semi-continuous 0 0 Anatomy of structure 75
This material is copyright - all rights reserved. Reproduced under licence from The Steel Construction Institute on 12/2/2007 To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.org/ Steel Designers' Manual - 6th Edition (2003) 76 Multi-storey buildings 2.3.5 Connections The most important aspect of structural steelwork for buildings is the design of the connections between individual frame components. The selection of a component should be governed not only by its capability to support the applied load, but also by its ease of connection to other components. Basically there are three types of connection, each defined by its structural behaviour: simple, continuous and semi-continuous (Fig. 2.31): (1) Simple connections transmit negligible bending moment across the joint: the connection is detailed to allow the beam end to rotate. The beam behaves as a simply supported beam. (2) Continuous connections are designed to transmit shear force and bending moment across the joint. The connection should have sufficient stiffness or moment capacity as appropriate to justify analysis by either elastic or plastic analysis. Beam end moments are transmitted into the column itself and any beam framing into the column on the opposite side. (3) Semi-continuous connections are designed to transmit the shear force and a proportion of the bending moment across the joint. The principle of these connections is to provide a partial restraint to beam end-rotation without introducing complicated fabrication to the joint. However, the design of such joints is complex, and so simple design procedures based upon experimental evidence have been developed for wider application. The advantages of semicontinuous design are lighter beams without the corresponding increase in column size and joint complexity that would be the case with fully continuous connections. References to Chapter 2 1. Hart F., Henn W., Sontag H. & Godfrey G.B. (Ed.) (1985) Multi-Storey Buildings in Steel, 2nd edn. Collins, London. 2. National Economic Development Office and Economic Development Committee for Constructional Steelwork (1985) Efficiency in the Construction of Steel Framed Multi-Storey Buildings. NEDO, Sept. 3. Owens G. (1987) Trends and Developments in the Use of Structural Steel for Multi-Storey Buildings. Steel Construction Institute, Ascot, Berks. 4. McGuire W. (1968) Steel Structures. Prentice-Hall. 5. Zunz G.J. & Glover M.J. (1986) Advances in Tall Buildings. Council on Tall Buildings and Urban Habitat. Van Nostrand Reinhold.
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