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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) Unstiffened Slab Base Connection of the steelwork 823 L -L :I:::::. .::::::::..:::::::. 1- 1- Stiffened Base _____ Pocket Base Stiffened base with bolt boxes (for heavy crane gantries) Fig. 27.6 Typical column base connections gap between bolt box and base plate dimensions a and b (see Fig. 27.7). The empirical method was replaced in BS5950: 2000 by the effective area method, which offers more economy than the empirical method while still producing safe designs when compared to test results. The effective area method for baseplate design may initially seem to be more complex than the empirical method given in BS 5950-1: 1990. However, the approach is much more reliable and can be used for all column sections. The basic design procedure is set out below.
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) 824 Foundations and holding-down systems / Effective area (a) (b) (c) L_j,bJ Fig. 27.7 Slab base design using the effective area method (1) Calculate required area = axial load/0.6 f cu. where: f cu is the cube strength of either the concrete or the grout, whichever is weaker. (2) Calculate outstand c (see Fig. 27.7(a)) by equating required area to actual area expressed as a function of c. The expression for the actual effective area of an I or H section may be approximated to 4c 2 + (column perimeter) ¥ c + column area. (3) Check that there is no overlap of effective area between flanges (see Fig. 27.7(b)). This will occur if 2c > the distance between the inner faces of the flanges. If an overlap exists, modify the expression for effective area and recalculate c. (4) Check the effective area fits on the size of baseplate selected (see Fig. 27.7(c)). If the effective area does not fit on the baseplate, modify the expression for effective area to allow for the limitations of the plate size and recalculate c,or
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