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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) V axis X—X axis Y—Y axis U—U axis V—V Y 'V rectangular axes maximum principal axis minimum principal axis Fig. 15.14 Geometrical properties of an angle section Special types of strut 421 In both cases, however, it will often be possible to design this more complex type of member as an equivalent single axially-loaded strut. 15.8.1 Design of compound struts Individual members may be combined in a variety of ways to produce a more efficient compound section. Figure 15.15 illustrates the most common arrangements. In each case the concept is one of providing a compound member whose overall slenderness will be such that its load-carrying capacity will significantly exceed the sum of the axial resistances of the component members, i.e. for the case of Fig. 15.15(b) the laced strut will be stronger than the four corner angles treated separately. Thus the design approach of BS 5950: Part 1 is to set conditions which when met permit the compound member to be designed as a single integral member. The following cases are considered explicitly: (1) Laced struts conforming with the provisions of clause 4.7.8 (2) Battened struts conforming with the provisions of clause 4.7.9 (3) Batten-starred angles conforming with the provisions of clause 4.7.11, which uses much of clause 4.7.9 (4) Batten parallel angle struts conforming with the provisions of clause 4.7.12 (5) Back-to-back struts conforming with the provisions of clause 4.7.13.1 if the components are separated and of clause 4.7.13.2 if the components are in contact. The detailed rules contained in these clauses are essentially of two types:
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) 422 Columns and struts z Y_JjL_Y z z z JiL 1i liL 1I z z (a) y y X_[1f_X y y y -x (b) Fig. 15.15 Typical arrangements for compound struts: (a) closely spaced, (b) laced or battened (1) Covering construction details such as the arrangements for interconnection in a general ‘good practice’ manner (2) Quantitative rules for the determination of the overall slenderness, limits necessary for component slenderness, forces for which the interconnections should be designed, etc.
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