Design of Small Base Plates for Wide Flange Columns 90

The 9th Edition• of the AISC Manual of Steel Construction
uses the Murray-Stockwell2 method for analysis of
small base plates, i.e., plates that are only slightly larger than
the column depth d and width bf. It combines this method
with the cantilever method of the 8th3 and earlier editions
for large base plates. The Murray-Stockwell method assumes
a bearing pressure of Ft,, the maximum permitted, over an
H-shaped contact area under the column cross-section
between the plate and the concrete. The cantilever method,
on the other hand, assumes a uniform bearing pressure, fp
< Fp, over the entire base plate surface of area BxN
(Fig. 1). Thus, the two methods assume very different bearing
pressure distributions and are difficult to combine into
a single method.
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