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Steel Designers' Manual - 6th Edition (2003)
Fig. 27.11 Pressure under bearing plate (2)
M
pressure
N = C-T
M = (Txa)+(Cxb)
Fig. 27.12 Distribution of forces and equations of equilibrium
Analysis 829
acteristic cube strength of the concrete base or the bedding material, whichever is
less. The lever arm for the design of the bolts is then from the centroid of this
stress block to the bolt position as shown in Fig. 27.12. The centroid of the stress
block is often less than the edge distance from the compression edge of the plate
to the holding-down bolt: it is therefore often assumed that the lever arm for
the bolts is equal to the centres of the bolts. It is also very likely that the point of
application of the compressive forces will be near to the holding-down bolts
due to the extra stiffening that is often included in the vicinity of the bolts. This is
illustrated in the typical design given as the fourth worked example at the end of
this chapter.